Stomata are responsible for gas exchange on leaves. Which option best describes this role?

Stomata are responsible for gas exchange on leaves. Which option best describes this role?

• A. Water transportation within the stem
• B. Structural support for leaves
• C. Gas exchange
• D. Nutrient storage in leaves

Answer: (C)

Gas exchange is the primary job of stomata. These tiny openings in the leaf surface, opened and closed by guard cells, regulate the movement of gases between the leaf and the atmosphere. When stomata are open, carbon dioxide can diffuse into the leaf to be used in photosynthesis, oxygen produced by photosynthesis diffuses out, and water vapor can also escape in a process called transpiration. This direct control of gas movement is what makes the stomata’s role best described as gas exchange. Water transport within the stem is handled by xylem, not stomata. Structural support comes from leaf tissues and cell walls, not from stomata. Nutrient storage in leaves involves different cells and tissues, not the openings themselves.

Gas exchange is the primary job of stomata. These tiny openings in the leaf surface, opened and closed by guard cells, regulate the movement of gases between the leaf and the atmosphere. When stomata are open, carbon dioxide can diffuse into the leaf to be used in photosynthesis, oxygen produced by photosynthesis diffuses out, and water vapor can also escape in a process called transpiration. This direct control of gas movement is what makes the stomata’s role best described as gas exchange.

Water transport within the stem is handled by xylem, not stomata. Structural support comes from leaf tissues and cell walls, not from stomata. Nutrient storage in leaves involves different cells and tissues, not the openings themselves.