2.2.2 Leaves Flashcards
Why is the top surface of a leaf waxy?
To stop water escaping from the leaf.
Which gas diffuses into a leaf?
Carbon dioxide
Why are there fewer chloroplasts in the cells of the bottom side of a leaf?
Because sunlight mainly hits the top of leaves so chloroplasts aren’t needed on the bottom as much.
Identify the diagram
The structure of a leaf
Stomata (holes) in leaves are opened and close by special cells called…
guard cells
Idenitfiy the missing label from the structure of a leaf
Stoma
(a single stomata)
How does being thin help a leaf to carry out photosynthesis?
Gases can move in and out of the leaf easily.
Idenitfiy the missing label from the structure of a leaf
Guard cell
Idenitfiy the missing label from the structure of a leaf
Spongy layer
Why is a leaf normally dark green on top but lighter on the bottom?
There are fewer chloroplasts on the bottom so there is less chlorophyll.
How do gases and water get in and out of a leaf?
Through holes called stomata
Idenitfiy the missing label from the structure of a leaf
Waxy layer
What is the name of the tube that carries glucose around the plant?
Phloem tubes
How is the structure of a leaf suited to carry out photosynthesis?
- Contain chlorophyll to capture sunlight.
- They are thin
- They have a large surface area
- They have veins
Name the 3 main layers of a leaf
- Waxy layer
- Palisade layer
- Spongy layer
How do veins help a leaf to carry out photosynthesis?
They are made from xylem tubes which can transport water for photosynthesis to take place.
How does a large surface area help a leaf to carry out photosynthesis?
A large surface area can capture as much light as possible.
Idenitfiy the missing label from the structure of a leaf
Chloroplast
Which gases diffuse out of a leaf?
Oxygen
Water vapour
Idenitfiy the missing label from the structure of a leaf
Palisade layer
Idenitfiy the missing label from the structure of a leaf
Air space
