B4 - Leaves and photosynthesis Flashcards Preview

Biology - Bethany DONE > B4 - Leaves and photosynthesis > Flashcards

Flashcards in B4 - Leaves and photosynthesis Deck (10):
1

What is the green colour in plants caused by?

Green chloroplasts in plant cells which contain green pigments called chlorophyll.

2

What does the vacuole do?

The vacuole holds water and gives shape to the cell.

3

What does the cell wall do?

The cell wall gives the cell support.

4

What is a palisade?

Tightly packed cells found in the upper layer of a leaf.

5

What is a spongy mesophyll?

Found in the middle of a leaf with large air spaces between.

6

What are guard cells?

Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange.

7

What are vascular bundles?

A strand of conducting vessels in the stem or leaves of a plant, typically with phloem on the outside and xylem on the inside.

8

How are leaf cells adapted for photosynthesis?

- the epidermis is thin and transparent allowing light through
- the palisade cells have lots of chloroplasts to absorb a lot of light
- air spaces between mesophyll cells allow gases to diffuse easily
- mesophyll are small and irregular increasing surface area to volume radio

9

What part of the plant takes in gas?

The stomata on the underside of the leaves.

10

How are leaves adapted for photosynthesis?

- being broad so it has a large surface area to absorb light
- being thin so gases do not have far to diffuse
- having a network of cells in vascular bundles to support it
- having stomata to allow carbon dioxide to diffuse into it and oxygen out
- having guard cells which control the size of the stomata during the day and night