AP Biology : Understanding the Water-Land Transition

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #1107 : Ap Biology

Which is of the following is not an adaptation/modification that enabled plants to move from aquatic to terrestrial environments as they evolved?

Possible Answers:

Stomata

Thylakoid membranes

Cutin

Roots and root hairs

Correct answer:

Thylakoid membranes

Explanation:

Thylakoid membranes are found within chloroplasts, which are used for photosynthesis. Plants found in both aquatic and terrestrial environments photosynthesize, so these membranes cannot be considered adaptations uniquely benefiting terrestrial plants.

Comparatively, cutin is a waxy coating found on various parts of plants that helps prevent water loss when exposed to air. Stomata are tiny openings in the epidermis of plants that allow for the exchange of carbon dioxide and oxygen while minimizing water loss. Roots and root hairs allow plants to absorb nutrients and water from the soil. Water loss was the primary challenge plants faced when moving from aquatic to terrestrial environments; cutin, stomata, roots, and root hairs all help terrestrial plants absorb and conserve water.

Example Question #1 : Understanding The Water Land Transition

Which structures did not evolve after plants emerged onto land?

Possible Answers:

Stomata

Cell walls

Seeds

Waxy cuticles

Vascular transport

Correct answer:

Cell walls

Explanation:

Cell walls were present in plant cells before the transition to land. Seeds, stomata, waxy cuticles, and vascular transport all evolved to reduce water loss and circulate water to all areas of the plant. Water loss and circulation were not an issue before the transition to land; plants were forced to adapt these traits in order to survive in a terrestrial environment.

Example Question #2 : Understanding The Water Land Transition

As plants moved from water to land, they developed structures and lifestyles better suited to life in their new environment. Which of the following is not an example of these adaptations?

Possible Answers:

Roots

Cuticle

Decrease in rigidity 

Vascular tissue

Increase in vertical height

Correct answer:

Decrease in rigidity 

Explanation:

Plants developed more rigid structures to help maintain their growth on land as opposed to water.

Waxy cuticles developed to help reduce water loss/desiccation. Roots allowed plants greater access to water, as well as provided anchoring to the ground; this allowed plants to grow taller. Vascular tissue facilitated transport of water and nutrients to all parts of the plant. Stomata helped with gas exchange.

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