Quiz on Gas Exchange and Transpiration

What is the main function of the lamina?

• Absorbs water from the soil

• Conducts food to other parts of the plant

• Provides a large surface area for photosynthesis

• Protects the plant from herbivores

The cuticle on a leaf helps to:

• Transport water

• Reduce water loss

• Store food

• Perform gaseous exchange

Which internal structure of a leaf contains the most chloroplasts?

• Spongy mesophyll

• Palisade mesophyll

• Xylem

• Phloem

What is the function of phloem in a leaf?

• Transporting water and minerals

• Transporting food produced in photosynthesis

• Providing mechanical support

• Carrying oxygen to cells

What is the main organ for gaseous exchange in plants?

• Roots

• Stem

• Leaves

• Flowers

The stomata in a leaf are mainly found in the:

• Upper epidermis

• Lower epidermis

• Palisade mesophyll

• Vascular bundle

What triggers the opening of stomata?

• Presence of light

• High carbon dioxide concentration

• Water deficiency

• Low humidity

During nighttime, stomata of desert plants remain closed to:

• Prevent oxygen loss

• Reduce transpiration

• Increase carbon dioxide absorption

• Absorb more sunlight

Transpiration is the process where plants:

• Absorb water through roots

• Convert light energy into food

• Lose water as vapor through stomata

• Store starch in leaves

The rate of transpiration increases with:

• Higher humidity

• Lower temperature

• Stronger wind speed

• Less sunlight