Gas Exchange and Transport in Plants

Why is it important that large amounts of oxygen are able to diffuse into the blood?

• To maintain body temperature

• To ensure efficient cellular respiration

• To prevent dehydration

• To aid in digestion

How do villi allow for active transport and diffusion to occur in the small intestine?

• By increasing the surface area for absorption

• By secreting digestive enzymes

• By producing hormones

• By storing nutrients

Respiration is required for active transport to occur, it is also important that active transport occurs in order for respiration to occur. Explain why.

• Active transport provides oxygen for respiration

• Respiration provides energy for active transport

• Active transport removes waste products of respiration

• Respiration and active transport are unrelated

Why is it important for gas exchange to be able to occur in plants?

• To absorb nutrients from the soil

• To release oxygen for animal use

• To facilitate photosynthesis

• To prevent water loss

When carbon dioxide levels fall, the rate of photosynthesis decreases. Use ideas about diffusion to explain why.

• Less carbon dioxide diffuses into the leaves

• More oxygen diffuses out of the leaves

• Water uptake by roots decreases

• Light absorption by chlorophyll decreases

Give three ways in which leaves are adapted for gas exchange.

• Thick cuticle, small surface area, and few stomata

• Large surface area, thin structure, and many stomata

• Waxy surface, deep veins, and thick structure

• Small surface area, thick structure, and few veins

Plants use active transport to gather nitrates that they use to make proteins. What do plants use proteins for?

• To store energy

• To provide structural support and enzymes

• To absorb sunlight

• To transport water

What is the role of stomata in the process of gas exchange in plants?

• To transport water from roots to leaves

• To allow gases to diffuse in and out of the leaf

• To store nutrients

• To produce chlorophyll

Which process in plants is directly affected by the availability of carbon dioxide?

• Transpiration

• Photosynthesis

• Respiration

• Protein synthesis

How does the thin structure of leaves aid in gas exchange?

• It reduces water loss

• It allows light to penetrate more easily

• It shortens the diffusion distance for gases

• It increases the leaf's strength