Rocky shores: Practice Questions

Where are sea anemones most likely to be found on a rocky shore during low tide to help them retain moisture and avoid drying out?

What is the most significant abiotic stress encountered by marine organisms living in the intertidal zone of a rocky shore during low tide?

Sea anemones (Cnidaria) living on rocky shores often retract their tentacles into their bodies when the tide goes out. Why is this behavioral adaptation essential for their survival?

Which zone of a rocky shore is characterized by being covered by water only at high tide and mainly exposed to air?

Which of the following abiotic factors significantly affects the distribution of organisms on a rocky shore?

Describe how the holdfast of the macroalga Fucus sp. and the shape of a limpet shell serve as adaptations to high wave action on rocky shores.

(a) Name and describe the three main vertical zones found on a typical rocky shore.
(b) State the function of a holdfast in macroalgae such as Fucus sp. and explain why it is a necessary adaptation for life on a rocky shore.

Rocky shores are dynamic environments where organisms are organized into distinct vertical zones based on their ability to survive various environmental stresses.
(a) Explain why the upper limit of a species' distribution on a rocky shore is generally determined by abiotic factors, while the lower limit is often determined by biotic factors.
(b) Compare the strategies used by a sea anemone (Cnidaria) and a mussel (Mollusca) to survive the stress of exposure to air during low tide in the intertidal zone.
(c) Describe how the physical structure of macroalgae, such as Fucus sp., allows it to survive in areas with high wave action.