specialised cells
- Created by: amandacygal
- Created on: 28-01-15 15:46
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- specialised cells
- palisade leaf cell
- adapted with chloroplasts for photosynthesis; nearer the top of the cell to get more light
- tall shape: more surface area to absorb carbon dioxide from the atmosphere
- thin; this means you can pack more of them at the top of the leaf as this is where more photosynthesis happens
- tall shape: more surface area to absorb carbon dioxide from the atmosphere
- adapted with chloroplasts for photosynthesis; nearer the top of the cell to get more light
- guard cells
- adapted to open and close pores
- kidney shape which opens and closes the stomata (pores) in aleaf
- when there is lots of water the guard cells will fill up and become turgid: the stomata will open so gases can be exchamhed for photosynthesis
- if the plant is short of water the guard cells lose more water and become flaccid, this closes the stomata to help prevent the loss of too much water.
- when there is lots of water the guard cells will fill up and become turgid: the stomata will open so gases can be exchamhed for photosynthesis
- kidney shape which opens and closes the stomata (pores) in aleaf
- thin outer walls and thicker inner walls make the opening and closeing work
- sensitive to light so they close at night: saving water without losing out on photosynthesis
- adapted for gas exchange and controlling water loss within a leaf
- adapted to open and close pores
- red blood cells
- concave shape gives a big surface area for absorbing oxygen, this also lets them pass easily through capillaries
- packed with haemoglobin which absorbs the oxygen
- have no nucleus leaving more room for haemoglobin
- sperm and egg cells
- egg cell:carries DNA and nourishes developing embryos, contains food reserves to feed embryo
- when a sperm fuses with egg the egg changes shape so that no other sperm cells can get in ensuring the right amount of DNA.
- sperm: male DNA to female DNA. long tail and a streamlined head to help it swim to the egg. lots of mitochondria to provide energy
- enzymes in the head to digest through the egg cell membrane.
- egg cell:carries DNA and nourishes developing embryos, contains food reserves to feed embryo
- palisade leaf cell
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