L2: Photosynthesis & Leaf Structure Reading Check Questions

What is the purpose of the waxy cuticle on the surface of a leaf?

• To allow gases to move freely

• To help prevent water loss

Answer explanation

The purpose of the waxy cuticle on the surface of a leaf is to help prevent water loss.

Which cells in a leaf conduct photosynthesis?

• Guard cells

• Mesophyll cells

Answer explanation

Mesophyll cells are the cells in a leaf that conduct photosynthesis.

What is the function of veins in a leaf?

• To supply water and nutrients to leaf cells

• To protect the plant against predators

Answer explanation

Veins in a leaf function to supply water and nutrients to leaf cells.

How do guard cells regulate water loss in a leaf?

• By conducting photosynthesis

• By closing the stomata

Answer explanation

Guard cells regulate water loss in a leaf by closing the stomates. This helps to prevent excessive transpiration and conserve water.

Which part of a leaf allows gases to enter and leave?

• Stomata

• Mesophyll cells

Answer explanation

Stomates are the small openings on the surface of leaves that allow gases, such as oxygen and carbon dioxide, to enter and leave the leaf. They are responsible for gas exchange in plants.

What happens to a plant when it loses more water through transpiration than it can replace?

• The plant grows taller

• The plant wilts

Answer explanation

When a plant loses more water through transpiration than it can replace, it wilts. This is the correct choice.

In which part of a leaf does photosynthesis occur?

• Guard cells

• Mesophyll cells

Answer explanation

Photosynthesis occurs in the mesophyll cells of a leaf. These cells contain chloroplasts, which are responsible for capturing sunlight and converting it into energy through photosynthesis.

What is the primary function of most leaves?

• To conduct photosynthesis

• To store water

Answer explanation

Most leaves conduct photosynthesis, which is their main function.

Which type of leaves lose less water?

• Leaves with a large surface area

• Leaves with a thick cuticle

Answer explanation

Leaves with a thick cuticle lose less water due to the protective layer on their surface.

Where does photosynthesis take place in plants like cacti?

• In the stems

• In the leaves

Answer explanation

Photosynthesis in plants like cacti takes place in the stems. The stems contain chlorophyll and other necessary components for photosynthesis.