Xerophyte Adaptations Video, Notes and Quiz

What is the primary site of gas exchange in plants?

• Vascular bundle

• Spongy mesophyll

• Palisade mesophyll

• Stomata

What are the two types of cells involved in the transport of water, dissolved mineral ions, and sucrose in plants?

• Guard cells and stomata

• Cuticle and epidermis

• Xylem and phloem

• Palisade and spongy mesophyll cells

What adaptation do xerophytic plants have to reduce water loss?

• Thicker cuticle

• Larger stomata

• Fewer chloroplasts

• Shorter roots

Why do stomata close at night?

• To allow carbon dioxide to diffuse out

• To reduce water loss

• To absorb more sunlight

• To prevent oxygen from escaping

What is the function of guard cells?

• To transport water

• To perform photosynthesis

• To create a pore for gas exchange

• To trap sunlight

Where does most photosynthesis occur in a leaf?

• Spongy mesophyll

• Palisade mesophyll

• Stomata

• Vascular bundle

What gas diffuses into the leaf for photosynthesis?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What structure is primarily responsible for the diffusion of gases in and out of the leaf?

• Stomata

• Cuticle

• Phloem

• Xylem

What is a characteristic feature of the cells in the palisade mesophyll?

• They are round and compact.

• They contain few chloroplasts.

• They are longer and packed with chloroplasts.

• They are primarily for water storage.

Why do xerophytic plants have sunken stomata?

• To attract more carbon dioxide

• To reduce water loss by trapping moisture

• To trap more sunlight

• To increase water absorption