B4 - Leaves and photosynthesis Flashcards Preview

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

What is the green colour in plants caused by?

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


What does the vacuole do?

The vacuole holds water and gives shape to the cell.


What does the cell wall do?

The cell wall gives the cell support.


What is a palisade?

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


What is a spongy mesophyll?

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


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.


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.


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


What part of the plant takes in gas?

The stomata on the underside of the leaves.


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