SL - B3.1 Gas Exchange in Plants

Which structure in the leaf helps reduce water loss while still allowing gas exchange?

• Cuticle

• Xylem

• Phloem

• Guard cells

What is the primary role of the air spaces in the leaf?

• To store water for photosynthesis

• To provide a large surface area for the exchange of gases

• To protect the leaf from pathogens

• To prevent the loss of water vapor

How do the guard cells control the opening and closing of stomata?

• By absorbing water, causing the stomata to open

• By releasing water, causing the stomata to close

• By changing their shape, regulating the stomatal pore size

• By increasing transpiration rate

The spongy mesophyll in a leaf is primarily adapted to:

• Absorb sunlight for photosynthesis

• Facilitate the movement of gases between cells

• Transport water and nutrients

• Store starch for energy

Which of the following structures is responsible for transporting water and nutrients within the leaf?

• Phloem

• Xylem

• Epidermis

• Guard cells

In a transverse section of a dicotyledonous leaf, which tissue is primarily responsible for photosynthesis?

• Epidermis

• Spongy mesophyll

• Palisade mesophyll

• Xylem

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Which of the following tissues is found just beneath the cuticle in a leaf section?

• Xylem

• Phloem

• Epidermis

• Palisade mesophyll

Which tissue is responsible for transporting sugars from the leaf to other parts of the plant?

• Xylem

• Phloem

• Epidermis

• Spongy mesophyll

In a leaf, the vascular bundle contains:

• Xylem and phloem

• Palisade mesophyll and epidermis

• Spongy mesophyll and xylem

• Epidermis and guard cells

Which layer in the leaf is most directly involved in the regulation of gas exchange?

• Epidermis

• Guard cells

• Palisade mesophyll

• Phloem

Tags

NGSS.HS-LS2-5