Biology B2 - Specialised Cells
- Created by: QueenGinge1
- Created on: 03-03-16 17:38
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- Specialised Cells
- Palisade Leaf Cells
- Adapted for photosynthesis
- Packed with chloroplasts at the top of the cell where light reaches
- Shape is tall which has a lot of surface area
- Means the sides ae exposed to absorb CO2 from the air in leaf
- Thin shape = loads can be pcked into leaf
- Guard Cells
- Kidney shaped that opens and closes the stomata (pores)in leaves
- when plant is filed with water, cells fill and go turgid
- Makes stomata open so gases can be exchanged for photosynthesis
- When plants short of water they lose water and become flaccid - makes stomata close
- Outer walls and inner thickened walls make it close and open
- Sensitive to light and are closed at night
- To save water without losing out on photosynthesis
- Adapted to function of allowing gas exchange and waterloss
- Red Blood Cells
- Concave shape adapted to carry oxygen
- Big surface area for absorbing oxygen and pass through capillaries smoothly
- Packed with haemoglobin
- They have no nucleus because they need more room for haemoglobin
- Sperm and Egg Cells
- Specialised for reproduction
- Egg cell caries female DNA to nourish developing embryos
- When sperm and egg fuse, cell wall changes to keep other sperm out
- So there is the right amount of chromosomes in it
- Sperm has long tail and streamline head to help it swim
- Has enzymes in the head to help dissolve the eggs cell wall
- Palisade Leaf Cells
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