Take this Quiz: A-Level Biology: Gas Exchange and Mass Transport | Zestly

Question 1

Which of the following statements accurately describes the relationship between surface area to volume ratio and the requirement for specialized exchange surfaces in multicellular organisms?

Accepted Answer

As an organism increases in size, its surface area to volume ratio decreases, necessitating specialized exchange systems to maintain adequate diffusion rates.

Question 2

In the gas exchange system of bony fish, which two factors contribute to the efficiency of the countercurrent flow mechanism?

Accepted Answer

A diffusion gradient is maintained across the entire length of the gill lamellae.

Question 3

Which of the following adaptations in insects are specifically designed to minimize water loss while facilitating gas exchange?

Accepted Answer

The presence of spiracles that can open and close to regulate gas exchange.

Question 4

In a dicotyledonous plant leaf, which structural features are specifically adapted to facilitate efficient gas exchange for photosynthesis?

Answer

A thick, waxy cuticle on the underside of the leaf to prevent water loss.

Answer

Numerous stomata on the lower epidermis to allow gas diffusion.

Answer

Air spaces in the spongy mesophyll layer to provide a large surface area for gas exchange.

Answer

Thin cell walls of the mesophyll cells to reduce the diffusion distance.

Answer

A dense layer of vascular bundles on the leaf surface to transport gases.

Question 5

Which of the following correctly describes the structural adaptations of human alveoli for efficient gas exchange?

Answer

The alveolar epithelium and capillary endothelium are each only one cell thick, creating a very short diffusion pathway.

Answer

The alveoli are surrounded by a thick layer of muscle to facilitate rapid ventilation.

Answer

The surface of the alveoli is coated with a thick mucus layer to trap pathogens and gases.

Answer

The alveoli have a low surface area to volume ratio to prevent excessive water loss during breathing.