問 1
1 点In the context of ecosystem sustainability, which of the following is essential for the long-term survival of a biological community?
IB Diploma Programme (DP) - SL & HL · Biology
D4.2 Stability and change (Ecosystems)：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 2 問。すべて「D4.2 Stability and change (Ecosystems)」からの出題です。
7 問14 点無料・登録不要
問 2
1 点Which of the following activities contributes most significantly to an individual's ecological footprint in a developed country?
問 3
1 点In an open ocean pelagic ecosystem, sustained overfishing of top predatory piscivorous fish leads to an increase in zooplanktivorous forage fish, causing a decline in large herbivorous zooplankton and a subsequent unchecked bloom of phytoplankton. What ecological phenomenon is demonstrated here?
問 4
1 点Which statement correctly defines an ecological tipping point in the context of sustainability and change?
問 5
1 点An enclosed forest ecosystem experiences a prolonged drought. Large canopy trees undergo severe water stress, leading to widespread mortality. The loss of canopy cover increases forest floor temperatures and desiccates litter, rendering the remaining vegetation susceptible to intense wildfires that convert the area into a stable dry savanna. What does this transition illustrate?
問 6
5 点Explain how a positive feedback loop involving boreal forest wildfire frequency and climate warming can lead to an ecological tipping point.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
4 点Ecosystems can maintain dynamic equilibrium, but severe human disturbances can trigger rapid state shifts.
a) Outline what is meant by a tipping point in an ecosystem.
b) Explain the role of positive feedback loops in driving an ecosystem past an ecological tipping point, using the example of Arctic sea ice loss.
c) Distinguish between the stability of an ecosystem with high species richness versus one with low species richness when subjected to environmental disturbance.
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