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gcse science B4 - A
specific for ocr gateway additonal science B.
| Question | Answer |
|---|---|
| which cell contains many chloroplasts? (high photosynthesis rate, lots of sugars and starch produced) | palisade cell |
| how does carbon dioxide enter and oxygen exit a leaf? | diffusion through the stomata |
| how is the epidermis adapted to maximize photosynthesis? | thin and transparent: allowing light through to inner cells. |
| how are the palisade cells adapted to maximize photosynthesis? | contain large numbers of chloroplasts to absorb lots of light energy |
| how are the chloroplasts adapted to maximize photosynthesis? | arranged mainly down the sides of palisade cells: allowing some light to reach the mesophyll cells |
| how are the air spaces between mesophyll cells adapted to maximize photosynthesis? | allow gases to diffuse easily and reach all cells |
| how are the mesophyll cells adapted to maximize photosynthesis? | small and irregular: increases surface to area volume ratio so large amounts of gases can enter/exit |
| how is a leaf adapted for photosynthesis? broad: | meaning there is a large surface area to absorb light |
| how is a leaf adapted for photosynthesis? thin: | so gases don't have far to travel and light can reach all the way through it |
| how is a leaf adapted for photosynthesis? chlorophyll: | in most of its cells |
| how is a leaf adapted for photosynthesis? network of specialized cells in veins: | which support it and carry water and sugars to different parts of the plant |
| how is a leaf adapted for photosynthesis? stomata: | which allows gas exchange: carbon dioxide to diffuse in, oxygen to diffuse out. |
Created by:
jirwin
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