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gcse science B4 - A

specific for ocr gateway additonal science B.

QuestionAnswer
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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