The sandy shore: แบบฝึกหัด

Many animals living on the sandy shore are described as infauna. What is the primary advantage of this lifestyle in this specific ecosystem?

The morphology of the sandy shore is heavily influenced by wave energy. A researcher recorded the following observations for two different beaches:

Beach X: High wave energy, slope angle \( 8^{\circ} \), coarse sand particles.
Beach Y: Low wave energy, slope angle \( 1^{\circ} \), fine sand particles.

Which conclusion is most accurate regarding the sediment transport and stability of these beaches?

Why is the sandy shore generally characterized by a lack of macroscopic primary producers compared to the rocky shore?

In an investigation of the sandy shore, a student compared the water retention and capillary action of two different sediment samples. The data is shown in the table below:

Sample A: Mean particle diameter \( 0.125\text{ mm} \), Water retained after 1 hour: \( 35\% \)
Sample B: Mean particle diameter \( 1.0\text{ mm} \), Water retained after 1 hour: \( 12\% \)

Which statement best explains the biological significance of these physical properties for infauna?

Which of the following best explains why the sandy shore typically exhibits lower species biodiversity compared to a rocky shore?

Explain why sandy shores with larger sand particles generally exhibit higher permeability compared to those with finer silt particles.

Explain how the physical properties of a sandy shore substrate act as a limiting factor for the biodiversity of sessile organisms.

Using a named example of a sandy shore organism, explain how its ability to burrow serves as an adaptation to both desiccation and predation during a tidal cycle.

(a) Explain why the high permeability and porosity of a sandy shore substrate contribute to the lack of surface-dwelling primary producers.
(b) Many organisms on the sandy shore are described as infauna. State one advantage of this lifestyle in relation to temperature and desiccation during a low tide.

(a) Describe the physical properties of the substrate on a sandy shore that make it an "unstable" environment for sessile organisms.
(b) Use the concept of trophic levels to explain why a sandy shore food web might have fewer levels compared to a rocky shore food web.