2025 Cambridge IGCSE Environmental Management (0680) 模擬試題連答案詳解

Part (a): The ultimate source of energy for ecosystems is solar radiation (sunlight). Producers capture this light energy and convert it into chemical energy through the process of photosynthesis. Part (b): Energy is lost at each trophic level. Organisms use energy for cellular respiration, metabolic processes, and physical movement, dissipating it as heat. Additionally, not all parts of an organism are consumed, and some consumed material is indigestible and excreted as waste. Because of this substantial cumulative energy loss, there is not enough energy left to sustain a trophic level beyond 4 or 5 steps.

Part (a): [Total: 2 marks] 1 mark for identifying sunlight/solar energy. 1 mark for identifying photosynthesis. Part (b): [Total: 4 marks] Max 3 marks for explaining energy losses: energy used in respiration/metabolic processes (1 mark); energy lost as heat to the environment (1 mark); energy lost in undigested matter/waste/excretion (1 mark); energy lost because not all biomass is consumed (1 mark). Max 1 mark for linking energy loss to food chain length: insufficient energy remains at high levels to support another viable population (1 mark).

Part (a): Key strategies to prevent overfishing include: 1. Net mesh size regulations: larger mesh sizes allow juvenile fish to escape, grow, and reproduce before being caught. 2. Quotas: governments set a Total Allowable Catch (TAC) to limit the biomass harvested. Other options include closed seasons or marine protected areas (MPAs). Part (b): International waters (the high seas) lie outside the Exclusive Economic Zones (EEZs) of individual countries. Therefore, no single nation has the legal authority to enforce laws there, leading to challenges with illegal, unreported, and unregulated (IUU) fishing, exacerbated by the vast spatial scale which is costly to patrol.

Part (a): [Total: 4 marks] 1 mark for each of two named strategies (e.g., quotas, mesh size, closed seasons, MPAs) [Max 2]. 1 mark for each corresponding explanation of how it protects stocks (e.g., mesh size allows young fish to escape to reach breeding age; quotas restrict total harvest to sustainable levels) [Max 2]. Part (b): [Total: 2 marks] 1 mark for identifying the core challenge (e.g., lack of international jurisdiction/sovereignty, or vast physical size of oceans). 1 mark for explanation (e.g., countries cannot legally enforce national laws in international waters, or monitoring vast areas requires satellite/patrol resources that are too expensive).

Part (a): Educating girls decreases birth rates because: 1. It keeps girls in school longer, delaying marriage and the onset of childbearing. 2. It opens up career opportunities, raising the opportunity cost of having children. 3. It increases literacy and access to health information, making family planning and contraception more readily understood and utilized. Part (b): Pronatalist policies are designed to increase the birth rate (often in response to aging populations), whereas antinatalist policies aim to decrease the birth rate (to control rapid population growth). A typical antinatalist measure is the provision of subsidized family planning clinics, public education campaigns promoting smaller family sizes, or financial incentives/disincentives.

Part (a): [Total: 3 marks] Award 1 mark for each distinct, explained reason: delay of marriage age / childbearing years (1 mark); empowerment/career focus shifting priorities away from large families (1 mark); better knowledge/understanding of family planning and contraception (1 mark); reduction in infant mortality leading to less need for 'replacement' births (1 mark). Part (b): [Total: 3 marks] 1 mark for defining pronatalist policy (promotes/increases births). 1 mark for defining antinatalist policy (restricts/decreases births). 1 mark for a valid antinatalist measure (e.g., free/subsidized contraceptives, family planning clinics, advertising campaigns, or legal/tax penalties for extra children).

(a)(i)
Step 1: Find the difference in species richness between Block A and Block B:
\( 84 - 48 = 36 \)

Step 2: Calculate the percentage decrease relative to Block A:
\( \frac{36}{84} \times 100 = 42.857... \% \)
Rounding to one decimal place gives 42.9%.

(a)(ii)
Suitable methods include using quadrats to sample smaller herbaceous vegetation or small saplings, and laying out line or belt transects to record species presence at regular intervals.

(b)
Selective logging targets only valuable timber species or mature trees, keeping the ecosystem's basic structure and biodiversity intact. In contrast, clear-felling is the indiscriminate removal of all trees in an area, leaving the soil exposed to erosion and causing total habitat destruction. Selective logging is more sustainable as it maintains ecological niches, protects the soil from nutrient leaching, and preserves seed trees for forest regeneration.

(c)
Pros of ecotourism:
- Generates income directly used for managing national parks and anti-poaching units.
- Increases local environmental education and appreciation.
- Empowers local communities financially, reducing their reliance on destructive practices like shifting cultivation.

Cons of ecotourism:
- Infrastructure (roads, lodges) destroys and fragments habitats.
- High tourist footfall can cause soil compaction and wildlife stress.
- Economic instability can suddenly dry up tourism funds.
- Alternative options like carbon offsetting schemes or international conservation grants might be more stable and less invasive.

(a)(i) [2 marks]
- 1 mark for correct working: \( \frac{84 - 48}{84} \times 100 \) or showing a difference of 36.
- 1 mark for correct calculated value: 42.9% (accept 43% or 42.86%).

(a)(ii) [2 marks]
- 1 mark for mentioning quadrats (random or systematic layout).
- 1 mark for mentioning transect lines/belts.
- Reject: aerial photography (not sampling vegetation directly).

(b) [4 marks]
- 1 mark for defining selective logging (only cutting selected/mature trees).
- 1 mark for defining clear-felling (cutting all trees down in an area).
- 2 marks for explaining sustainability benefits of selective logging (e.g., reduces soil erosion, maintains habitat/canopy structure, preserves seed sources for regeneration, protects local food webs).

(c) [4 marks]
- Award 1 mark per valid point up to 4 marks. Must show balance (pros and cons) for full marks, with a concluding judgment statement.
- Points include:
- Pro: Income supports park rangers/research [1]
- Pro: Alternative livelihood for locals instead of hunting/logging [1]
- Con: Infrastructure causes habitat loss/pollution [1]
- Con: Tourist presence disturbs breeding patterns of animals [1]
- Alternative: Carbon credits/fines/conservation grants are more stable [1]

(a)(i)
Step 1: Calculate the loss in biomass:
\( 150,000 - 45,000 = 105,000 \text{ tonnes} \)

Step 2: Calculate the percentage decrease:
\( \frac{105,000}{150,000} \times 100 = 70\% \)

(a)(ii)
One reason is illegal, unreported, and unregulated (IUU) fishing, where vessels fish in restricted zones or catch more than their allowance without reporting it. Alternatively, quota allocations may be based on inaccurate, outdated scientific data, or may be set higher than recommended levels due to political and economic pressure to save fishing jobs.

(b)
- Technological advancement 1: Sonar and echo-sounders. These allow vessels to locate schools of fish with high precision, leaving no natural 'hiding places' for fish stocks.
- Technological advancement 2: Large-scale drift nets or bottom-trawling nets combined with powerful engines. These sweep huge areas of ocean, catching massive quantities of target and non-target species in a single sweep.
- Technological advancement 3: Refrigerated factory ships. These allow fleets to stay at sea for weeks or months, processing and freezing fish instantly, removing the limitation of returning to port before fish spoils.

(c)
Marine Reserves:
- Highly effective at protecting entire ecosystems, including habitats like coral reefs or kelp forests.
- Provide safe havens where fish can grow to maximum size and produce exponential numbers of offspring, which then spill over into adjacent fishing zones.
- Hard to monitor and enforce over vast ocean spaces.

Net Mesh Size Regulations:
- Let juvenile fish escape to ensure they reach reproductive age before being harvested.
- Simpler to inspect at ports.
- Do not prevent bottom trawling from destroying benthic habitats.
- Fish can still die from stress or damage when squeezed through the net mesh.

(a)(i) [2 marks]
- 1 mark for correct working: \( \frac{150,000 - 45,000}{150,000} \times 100 \) or showing a difference of 105,000.
- 1 mark for correct calculated value: 70%.

(a)(ii) [2 marks]
- 1 mark for identifying a reason (e.g., IUU fishing, overestimating stocks, political pressure, bycatch discarding).
- 1 mark for a clear explanation of how this leads to depletion despite quotas.

(b) [4 marks]
- 2 marks for describing technological advancements (e.g., sonar, satellite navigation, factory ships, synthetic monofilament nets).
- 2 marks for explaining how each advancement directly leads to overexploitation (e.g., removing refuges, allowing longer times at sea, catching entire populations at once).

(c) [4 marks]
- Max 2 marks if only marine reserves or only mesh sizes are discussed.
- 1 mark for benefit of marine reserves (ecosystem restoration, nursery protection).
- 1 mark for drawback of marine reserves (difficult enforcement, shifts pressure).
- 1 mark for benefit of mesh sizes (juveniles escape to reproduce).
- 1 mark for drawback of mesh sizes (bycatch still occurs, does not stop habitat destruction from trawls).

(a)(i)
- Trophic level: The feeding position or level that an organism occupies in a food chain or food web (e.g., primary consumer).
- Producer: An autotrophic organism (typically green plants or algae) that synthesizes its own organic matter from inorganic substances, utilizing light energy through the process of photosynthesis.

(a)(ii)
Energy transfer between trophic levels is highly inefficient. On average, only about 10% of the energy stored in the biomass of one trophic level is converted into biomass at the next level. The remaining 90% is lost to the environment as heat from cellular respiration, through metabolic activity, movement, excretion, and unconsumed parts (like bones and roots). By the time energy reaches the fourth or fifth trophic level, the total available energy is too small to sustain a viable population of top predators.

(b)
Example: A Freshwater Lake Ecosystem.
- Abiotic factors: Light penetration, dissolved oxygen levels, water temperature, and dissolved nutrient concentrations.
- Biotic factors: Phytoplankton, zooplankton, fish, and decomposers.
- Interaction: High nutrient runoff (abiotic) triggers rapid growth of algae (biotic). This algae block sunlight (abiotic) from reaching submerged aquatic plants, causing them to die. Decomposers (biotic) break down the dead plants, consuming dissolved oxygen (abiotic), which leads to the suffocation and death of fish (biotic).

(c)
Arguments in support of the statement:
- Invasive predators often lack natural enemies in their new habitat, allowing their population to grow unchecked.
- Native prey species may have no evolutionary defenses ('prey naivety'), leading to rapid extinction of key species (e.g., the introduction of the Nile perch in Lake Victoria decimated endemic cichlid species, altering the entire ecosystem structure).

Arguments against the statement:
- Many ecosystems possess functional redundancy, where other species can fill ecological roles if one species declines.
- Biotic resistance: Local predators or diseases may adapt to feed on or control the invasive species, keeping its population in check.
- Abiotic limitations: The introduced predator might only survive in disturbed margins of the ecosystem, leaving core areas intact.

(a)(i) [2 marks]
- 1 mark for correct definition of trophic level.
- 1 mark for correct definition of producer (must mention producing own food/organic nutrients or photosynthesis).

(a)(ii) [3 marks]
- 1 mark for stating that energy is lost at each transfer / only 10% is passed on.
- 1 mark for explaining pathways of loss (respiration, heat, movement, undigested material).
- 1 mark for explaining that after 4-5 levels, the remaining energy is too low to support a viable population.

(b) [3 marks]
- 1 mark for naming a specific ecosystem (e.g., desert, tropical rainforest, marine coral reef).
- 1 mark for identifying a relevant biotic and abiotic factor within that ecosystem.
- 1 mark for describing a clear interaction between them (e.g., lack of water in desert restricts plant growth to drought-resistant species).

(c) [4 marks]
- Award up to 2 marks for arguments agreeing with the statement (e.g., examples of invasive predators like brown tree snake, lack of natural predators, extinction of endemic species).
- Award up to 2 marks for arguments disagreeing with the statement (e.g., ecosystem resilience, biotic resistance, native species adapting, invader failing to thrive).
- Must provide a balanced conclusion for the 4th mark.

(a)(i)
Step 1: Find the percentage of renewable energy:
\( 100\% - (45\% + 25\% + 15\%) = 15\% \)

Step 2: Calculate the angle for the pie chart:
\( 15\% \text{ of } 360^{\circ} = \frac{15}{100} \times 360 = 54^{\circ} \)

(a)(ii)
1. Nuclear power stations do not emit carbon dioxide (\( \text{CO}_2 \)) or other greenhouse gases during operation, thereby not contributing to global warming.
2. They do not release air pollutants such as sulfur dioxide (\( \text{SO}_2 \)) or nitrogen oxides (\( \text{NO}_x \)), which are responsible for acid rain and respiratory illnesses.

(b)
Objections to onshore wind farms include:
- Visual impact: Many people find large wind turbines unsightly and argue they ruin the aesthetic value of natural landscapes or rural environments.
- Noise pollution: The aerodynamic hum of the rotating blades and mechanical noise from the gearbox can disturb residents living nearby.
- Ecological impacts: Turbines can kill birds and bats through direct collisions.
- Economic concerns: Fear of reduced local property values and negative impacts on tourism.

(c)
Arguments in agreement (Why they should rely on renewables):
- Leapfrogging: Developing countries can directly adopt modern clean energy tech, bypassing the costly transition from fossil fuels later.
- Resource abundance: Many developing countries have excellent solar, wind, or geothermal potential.
- Energy independence: Reduces reliance on expensive imported fossil fuels, improving balance of payments.

Arguments in disagreement (Why they still need fossil fuels / why it is difficult):
- High capital cost: Renewables have high upfront installation costs, which poor nations may struggle to finance.
- Intermittency: Solar and wind do not provide constant power. Without expensive grid batteries or backup gas plants, power outages can occur, crippling industrialization.
- Baseload power: Heavy industries (steel, manufacturing) require steady, reliable baseload electricity, which is currently cheapest to provide via coal or gas.

(a)(i) [2 marks]
- 1 mark for calculating the percentage of renewable energy (15%).
- 1 mark for the correct angle calculation (54°).

(a)(ii) [2 marks]
- 1 mark for stating no greenhouse gas emissions / no contribution to global warming.
- 1 mark for stating no acidic gas emissions (SO2/NOx) / no contribution to acid rain.
- Note: Do not accept 'no pollution' (nuclear waste is a pollutant).

(b) [4 marks]
- Award 1 mark for each distinct reason explained up to 4 marks:
- Visual impact / spoiling rural landscapes [1]
- Noise pollution from blades disrupting sleep/peace [1]
- Threat to birds/bats (collision risk) [1]
- Loss of value in local properties or impact on local tourism [1]

(c) [4 marks]
- Balanced answer required for full marks (points for and against).
- Up to 2 marks for agreeing (leapfrogging technology, reducing carbon emissions, utilizing abundant local natural resources).
- Up to 2 marks for disagreeing (intermittency of solar/wind, high initial capital/infrastructure costs, need for reliable baseload power for industrial development).
- 1 mark for concluding evaluation.

(a)(i)
Natural increase is the rate at which a population grows due to the difference between births and deaths, excluding migration.
Formula: \( \text{Natural Increase} = \text{Birth Rate} - \text{Death Rate} \) (usually expressed per 1000 people).

(a)(ii)
Step 1: Calculate the natural increase per 1000:
\( 34 - 9 = 25 \text{ per 1000} \)

Step 2: Convert to a percentage:
\( \frac{25}{1000} \times 100 = 2.5\% \)

(b)
- Strategy 1: Improvement of female education and literacy.
- How it works: When girls stay in school longer, they delay marriage and childbearing. Educated women are more likely to pursue careers, understand family planning options, and desire smaller family sizes.
- Strategy 2: Government provisioning of accessible family planning services and subsidized contraception.
- How it works: Increases availability of contraceptives in rural and urban areas, accompanied by public health campaigns to reduce the social stigma of family planning.
- Strategy 3: Financial incentives or policies (e.g., tax benefits for smaller families, or penalties for large families).
- How it works: Increases the direct economic cost of having multiple children, motivating families to have fewer children.

(c)
Arguments in favor of economic development:
- As a nation transitions from an agricultural economy to an industrial/service economy, children are no longer needed as free farm labor. Instead, they become economic liabilities due to the cost of schooling, housing, and food.
- Higher living standards reduce infant mortality, so parents no longer need to have 'extra' children to ensure some survive to adulthood.
- Pension systems reduce the reliance on children for old-age security.

Arguments against (other factors are more important/effective):
- Some countries have achieved rapid fertility declines through aggressive family planning programs and social reforms despite remaining relatively poor (e.g., Bangladesh, or Kerala in India).
- Social changes, specifically female empowerment, legal rights for women, and access to reproductive healthcare, can drive down birth rates much faster than waiting for general economic development (GDP growth) to filter down.

(a)(i) [2 marks]
- 1 mark for defining natural increase (excess of births over deaths / growth of population excluding migration).
- 1 mark for formula: Birth Rate - Death Rate.

(a)(ii) [2 marks]
- 1 mark for correct working: \( 34 - 9 = 25 \) per 1000.
- 1 mark for correct percentage: 2.5% (must include % sign or specify unit).

(b) [4 marks]
- Award 1 mark for each of the two strategies identified (e.g., family planning clinics, educating girls, financial incentives, minimum marriage age laws).
- Award 1 mark for each corresponding explanation of how it reduces the birth rate.

(c) [4 marks]
- Award up to 2 marks for explaining why economic development works (e.g., change from agriculture to industry, children become expensive, introduction of pensions, lower infant mortality).
- Award up to 2 marks for arguing that social policies or other factors are more effective/equally important (e.g., female literacy, availability of birth control, fast results without needing industrialization).
- 1 mark for a balanced conclusion.

### Part (a) Working and Calculation
1. **Latitude Change:**
- Direction: North (moving towards the equator from the Southern Hemisphere, so value becomes less negative/closer to 0).
- Distance: 55.5 km.
- Degrees: \(55.5 \text{ km} / 111 \text{ km per degree} = 0.50^\circ\).
- New Latitude: \(2.00^\circ \text{S} - 0.50^\circ \text{ North} = 1.50^\circ \text{S}\).

2. **Longitude Change:**
- Direction: East (value increases).
- Distance: 111.0 km.
- Degrees: \(111.0 \text{ km} / 111 \text{ km per degree} = 1.00^\circ\).
- New Longitude: \(130.00^\circ \text{E} + 1.00^\circ \text{ East} = 131.00^\circ \text{E}\).

- **Final Coordinates:** \(1.50^\circ \text{S}, 131.00^\circ \text{E}\).

### Part (b) Food Chain
1. **Food Chain Construction:**
\(\text{phytoplankton} \rightarrow \text{zooplankton} \rightarrow \text{reef-building corals} \rightarrow \text{crown-of-thorns starfish} \rightarrow \text{giant triton snails}\)
- Arrows point from prey to predator, representing the direction of energy flow.
2. **Identification:**
- **Primary Producer:** phytoplankton
- **Tertiary Consumer:** crown-of-thorns starfish (1st: zooplankton, 2nd: corals, 3rd: starfish)

### Part (c) Definitions
1. **Trophic Level:** The position or stage that an organism occupies in a food chain, food web, or ecological pyramid (e.g., producer, primary consumer).
2. **Sustainable Yield:** The maximum rate or amount of a biological resource (such as fish) that can be harvested or extracted without depleting the resource over time or damaging its long-term productivity.

### Part (d) Demographic Shift Analysis
1. **Evaluation:**
- **Short-term effect:** Pressure on marine resources may remain stable or slightly increase because the surviving infant population is growing up, and the current absolute population size is still high (population momentum).
- **Long-term effect:** The dramatic decline in crude birth rate indicates a stabilizing population size. This will significantly reduce future demand for food, livelihood, and building materials (e.g., mangrove wood, coral sand), lowering overall pressure on local reefs.
2. **Management Policy:**
- Provide vocational training and microfinance for alternative livelihoods (such as community-led marine ecotourism or sustainable seaweed farming) which transitions families away from extraction-based livelihoods.

### Part (e) Sustainable Energy and Conservation Plan
1. **Zoning and Marine Spatial Planning (MSP):** Limit energy installations to non-sensitive zones. Offshore turbines must be located away from core conservation areas and key tourist diving sites.
2. **Construction Mitigations:** Implement strict regulations to prevent damage to benthic habitats. Use silt curtains during installation to prevent sediment from choking coral polyps. Schedule construction outside of critical fish spawning seasons.
3. **Cable Routing:** Subsea power cables should be routed through sandy channels rather than being laid directly over live coral reefs.
4. **Artisanal Fishing Integration:** Establish exclusion zones around the turbines for large commercial vessels while allowing restricted artisanal fishing or seaweed farming. The turbine bases can act as artificial reefs, increasing fish biomass, which spill over into designated local fishing zones.
5. **Conflict Resolution:** Involve local communities in decision-making (co-management), ensuring they receive direct benefits (e.g., subsidized electricity from the project) to foster ownership and compliance.

### Part (a) [4 marks]
- Award 1 mark for calculating latitude change of \(0.50^\circ\).
- Award 1 mark for correct final latitude of \(1.50^\circ \text{S}\) (accept \(-1.50^\circ\)).
- Award 1 mark for calculating longitude change of \(1.00^\circ\).
- Award 1 mark for correct final longitude of \(131.00^\circ \text{E}\).

### Part (b) [5 marks]
- Award 1 mark for all five organisms in correct sequence.
- Award 2 marks for all arrows pointing in the correct direction (from prey to predator). Deduct 1 mark if arrows are omitted or reversed.
- Award 1 mark for identifying 'phytoplankton' as the primary producer.
- Award 1 mark for identifying 'crown-of-thorns starfish' as the tertiary consumer.

### Part (c) [4 marks]
- **Trophic Level:** Award 1 mark for mentioning 'position/stage/level' and 1 mark for referencing 'in a food chain/web'.
- **Sustainable Yield:** Award 1 mark for mentioning 'maximum harvest/catch/extraction' and 1 mark for stating 'without reducing future supply/regenerative capacity/depleting the stock'.
- Do not accept vague answers such as "fishing without hurting the environment".

### Part (d) [6 marks]
- **Part 1 (Evaluation):** Up to 4 marks. Award 1 mark for identifying that falling birth rates shift the population toward stabilization. Award 1 mark for identifying that lower infant mortality keeps current demand high in the short term. Award 2 marks for explaining that long-term pressure on fisheries and reefs will decrease due to reduced future demand.
- **Part 2 (Policy):** Up to 2 marks. Award 1 mark for a specific policy (e.g., alternative livelihood programs, women's education, family planning) and 1 mark for explaining how it reduces pressure on fishing.

### Part (e) [7.67 marks]
- Award up to 4 marks for the details of the design plan:
- 1 mark for Marine Spatial Planning / zoning away from live reefs.
- 1 mark for cable routing solutions (sandy pathways).
- 1 mark for construction mitigations (silt curtains, seasonal bans).
- 1 mark for integrating artisanal fishing rights (restricted co-use zones).
- Award up to 2 marks for conflict resolution strategies (local co-management, provision of free/subsidized power to locals).
- Award 1.67 marks for overall clarity, completeness, and feasibility of the conservation-energy balance.

### Part (a) Working and Calculation
1. **Latitude Change:**
- Direction: South (moving further away from the equator in the Southern Hemisphere, so value increases in S).
- Distance: 166.5 km.
- Degrees: \(166.5 \text{ km} / 111 \text{ km per degree} = 1.50^\circ\).
- New Latitude: \(0.50^\circ \text{S} + 1.50^\circ \text{ South} = 2.00^\circ \text{S}\).

2. **Longitude Change:**
- Direction: West (value increases in W).
- Distance: 111.0 km.
- Degrees: \(111.0 \text{ km} / 111 \text{ km per degree} = 1.00^\circ\).
- New Longitude: \(90.00^\circ \text{W} + 1.00^\circ \text{ West} = 91.00^\circ \text{W}\).

- **Final Coordinates:** \(2.00^\circ \text{S}, 91.00^\circ \text{W}\).

### Part (b) Food Chain
1. **Food Chain Construction:**
\(\text{green algae} \rightarrow \text{marine iguanas} \rightarrow \text{Galapagos hawks}\)
- Note: The diatom-krill-blue whale chain is an open-ocean chain, not the coastal rocky shore chain requested.
2. **Identification:**
- **Primary Producer:** green algae
- **Secondary Consumer:** Galapagos hawks (marine iguana is the primary consumer)

### Part (c) Definitions
1. **Biodiversity:** The variety of life in the world or in a particular habitat or ecosystem, encompassing species diversity, genetic diversity, and ecosystem diversity.
2. **Maximum Sustainable Yield (MSY):** The highest theoretical or practical catch of a fish stock or resource that can be taken year after year without causing the stock size to decline over time.

### Part (d) Demographic Analysis
1. **Evaluation:**
- Controlling population size prevents an exponential increase in domestic demand for fish and invertebrates like sea cucumbers and lobsters.
- Fewer residents mean fewer local fishers, making monitoring, licensing, and enforcement of fishing quotas manageable for park rangers.
- It limits the market size for illegal catches, as there are fewer local restaurants and buyers.
2. **Environmental Impacts of Uncontrolled Growth:**
- Increased sewage discharge and untreated wastewater runoff leading to coastal eutrophication and coral reef degradation.
- Increased risk of introduction of terrestrial invasive species (pests, domestic animals) that can escape and disrupt coastal nesting grounds.

### Part (e) Renewable Energy and Marine Zoning Integration
1. **Land-Based Solar/Wind Priority:** To avoid marine acoustic disruption, place wind turbines and solar panels on degraded, non-coastal land on inhabited islands rather than offshore marine structures.
2. **Avoid Acoustic Disruption:** Ensure that any marine-based elements (e.g., subsea cables) avoid key marine mammal migration and feeding pathways. Keep maintenance boat traffic out of marine mammal core areas to reduce underwater noise.
3. **Sustainable Biofuel Sourcing:** Use only waste vegetable oil or non-crop land biofuels (like jatropha) to prevent clearing native coastal vegetation.
4. **Marine Zoning Integration:**
- Maintain absolute "No-Take Zones" (sanctuaries) where no energy infrastructure, shipping, or fishing is allowed.
- Establish a buffer zone around marine energy structures where only low-impact scientific research is permitted.
- Use renewable-powered patrol vessels to enforce the boundaries of the Marine Reserve, utilizing the new clean energy grid to recharge patrol fleets.

### Part (a) [4 marks]
- Award 1 mark for calculating latitude change of \(1.50^\circ\).
- Award 1 mark for correct final latitude of \(2.00^\circ \text{S}\).
- Award 1 mark for calculating longitude change of \(1.00^\circ\).
- Award 1 mark for correct final longitude of \(91.00^\circ \text{W}\).

### Part (b) [5 marks]
- Award 1 mark for selecting the correct three rocky shore organisms (green algae, marine iguanas, Galapagos hawks) in sequence. (Reject diatoms/krill/blue whale as they are open-ocean).
- Award 2 marks for correct arrows pointing from prey to predator.
- Award 1 mark for identifying 'green algae' as the primary producer.
- Award 1 mark for identifying 'Galapagos hawks' as the secondary consumer.

### Part (c) [4 marks]
- **Biodiversity:** Award 1 mark for referencing 'variety/range of different species' and 1 mark for including genetic or ecosystem diversity.
- **MSY:** Award 1 mark for 'maximum/highest average catch' and 1 mark for 'without reducing/depleting the population/stock size over time'.

### Part (d) [6 marks]
- **Part 1 (Evaluation):** Award up to 4 marks. Expect points on: reduced local consumption demand, fewer active fishers making policing easier, reduced development pressure along coastal breeding sites, and containment of local commercial markets.
- **Part 2 (Impacts):** Award up to 2 marks (1 mark for each valid impact) such as sewage/chemical water pollution, plastic pollution, habitat destruction for ports, and introduction of invasive species.

### Part (e) [7.67 marks]
- Award up to 4 marks for the sustainable energy strategy details:
- 1 mark for preference of land-based renewables over offshore to protect marine acoustics.
- 1 mark for sustainable biofuel selection (non-food, native protection).
- 1 mark for minimizing marine transport noise near cetacean pathways.
- 1 mark for using renewable energy to power park monitoring vessels.
- Award up to 2 marks for marine zoning integration (no-take zones protected from infrastructure, buffer zone management).
- Award 1.67 marks for overall quality, cohesion of the plan, and scientific accuracy.

### Part (a) Working and Calculation
1. **Latitude Change:**
- Direction: South (latitude decreases in Northern Hemisphere).
- Distance: 111.0 km.
- Degrees: \(111.0 \text{ km} / 111.0 \text{ km per degree} = 1.00^\circ\).
- New Latitude: \(58.50^\circ \text{N} - 1.00^\circ \text{ South} = 57.50^\circ \text{N}\).

2. **Longitude Change:**
- Direction: East (longitude increases in Eastern Hemisphere).
- Distance: 55.5 km.
- Degrees: \(55.5 \text{ km} / 55.5 \text{ km per degree} = 1.00^\circ\).
- New Longitude: \(20.00^\circ \text{E} + 1.00^\circ \text{ East} = 21.00^\circ \text{E}\).

- **Final Coordinates:** \(57.50^\circ \text{N}, 21.00^\circ \text{E}\).

### Part (b) Food Chain
1. **Food Chain Construction:**
\(\text{phytoplankton} \rightarrow \text{zooplankton} \rightarrow \text{herring} \rightarrow \text{cod} \rightarrow \text{grey seals}\)
- Arrows must point from prey to predator, representing the flow of energy.
2. **Identification:**
- **Primary Consumer:** zooplankton (feeds directly on phytoplankton)
- **Quaternary Consumer:** grey seals (occupies the 5th trophic level / 4th consumer level)

### Part (c) Definitions
1. **Eutrophication:** The enrichment of water bodies with nutrients (principally nitrates and phosphates), typically from agricultural runoff or sewage, which stimulates rapid algal growth (blooms), leading to oxygen depletion (hypoxia/anoxia) when the algae die and decompose, suffocating aquatic life.
2. **Bycatch:** The accidental or unintentional capture of non-target marine species (such as juvenile fish, marine mammals, seabirds, or non-commercial species) during commercial fishing operations.

### Part (d) Demographic Shift Evaluation
1. **Reduction in Agricultural Runoff:**
- A stable or declining population stabilizes national food and agricultural demand.
- This prevents the need to further intensify agricultural production (which would require higher application rates of chemical fertilizers).
- Farmers can transition to more sustainable, low-input farming practices (organic farming, cover cropping) without risking national food security, lowering nitrate and phosphate runoff.
2. **Need for Wastewater Modernization:**
- Existing municipal sewage infrastructure is aging and prone to leaks of untreated sewage.
- Climate change is causing more frequent and intense rainfall events, leading to combined sewer overflows (CSOs) that bypass treatment plants unless storm-water capacity is increased.
- An aging population increases the release of pharmaceuticals and microplastics, which standard secondary treatment plants cannot filter out, necessitating tertiary/advanced treatment upgrades.

### Part (e) Sustainable Offshore Wind Plan
1. **Acoustic Mitigation (Bubble Curtains):** Require the mandatory use of bubble curtains (rings of rising air bubbles around the pile-driving site) and hydro-acoustic dampers during construction. This absorbs sound waves, preventing auditory injury to harbor porpoises.
2. **Seasonal Spatial Planning (Bans):** Prohibit construction/pile-driving during the peak spawning seasons of Baltic cod (typically spring/summer) and key harbor porpoise breeding/migration seasons.
3. **Cable Burying:** Ensure subsea transmission cables are deeply buried beneath the seabed to shield sensitive electro-receptive fish species (like elasmobranchs) from electromagnetic fields.
4. **Artificial Reef Integration:** Design turbine foundations with textured surfaces and micro-habitats to encourage the settlement of blue mussels and kelp. Mussels are filter feeders that consume phytoplankton, helping locally mitigate eutrophication and providing shelter for juvenile cod.
5. **Climate and Ecological Balance:** Explain that the transition to wind energy reduces greenhouse gases, helping prevent ocean acidification and rising sea temperatures, which are long-term existential threats to the Baltic ecosystem. By applying strict construction mitigations, the localized, short-term ecological costs are balanced against global climate benefits.

### Part (a) [4 marks]
- Award 1 mark for calculating latitude change of \(1.00^\circ\).
- Award 1 mark for correct final latitude of \(57.50^\circ \text{N}\).
- Award 1 mark for calculating longitude change of \(1.00^\circ\).
- Award 1 mark for correct final longitude of \(21.00^\circ \text{E}\).

### Part (b) [5 marks]
- Award 1 mark for all 5 organisms in correct sequence.
- Award 2 marks for all arrows pointing in the correct direction (from prey to predator).
- Award 1 mark for identifying 'zooplankton' as the primary consumer.
- Award 1 mark for identifying 'grey seals' as the quaternary consumer.

### Part (c) [4 marks]
- **Eutrophication:** Award 1 mark for 'nutrient enrichment/excess fertilizers' and 1 mark for 'leading to algal blooms / oxygen depletion / dead zones'.
- **Bycatch:** Award 1 mark for 'unintentional/accidental capture' and 1 mark for 'of non-target species'.

### Part (d) [6 marks]
- **Part 1 (Runoff):** Award up to 3 marks. 1 mark for linking demographic stabilization to stable food demand. 1 mark for stating this reduces the pressure to use excessive chemical fertilizers. 1 mark for linking this directly to lower runoff of nitrates/phosphates into the sea.
- **Part 2 (Wastewater):** Award up to 3 marks. 1 mark for identifying climate change causing heavy rains/combined sewer overflows. 1 mark for mentioning aging infrastructure leaking nutrients. 1 mark for noting new pollutants (pharmaceuticals/microplastics) that require advanced tertiary treatment.

### Part (e) [7.67 marks]
- Award up to 4 marks for specific mitigation technologies:
- 1 mark for bubble curtains to mitigate acoustic damage.
- 1 mark for seasonal construction bans during cod spawning.
- 1 mark for subsea cable burying.
- 1 mark for designing turbine bases to act as artificial reefs (nutrient filtration by mussels).
- Award up to 2 marks for balancing local ecological impacts with global climate goals (GHG reduction, ocean acidification mitigation).
- Award 1.67 marks for overall clarity, depth of scientific reasoning, and structure of the sustainable energy design.