Palisade Leaf Cell
Are adapted for photosynthesis by:
- Packed with chloroplasts for photosynthesis-so more crammed at top of cell (nearer to the light)
- Tall shape means more surface area exposed down side for absorbing CO2 from air in the leaf
- Thin shape means you can pack loads of them at top of leaf
Palisade leaf cells- grouped together at top of leaf where most of photosynthesis happens.
Guard Cells are adapted to open & close pores
- Special kidney shape which opens & closes the stomata (pores) in a leaf
- When plant has lots of water, guard cells fill with it & go plump and turgid.
- Makes the stomata open so gases can be exchanged for photosynthesis
- Plant is short of water, guard cells lose water & become flaccid (making stomata close)
- Helps to stop too much water vapour escaping
- Thin outer wals & thickened inner walls make the opening & closing work
- Also sensitive to light & close at night to save water, without losing out on photosynthesis
Guard cells- adapted to their function of allowing gas exchange & controlling water loss within a leaf
Red Blood Cells
Red Blood Cells are addapted to carry oxygen
- Concave shape give a bigger surface area for absorbing oxygen
- Also helps them pass smoothly through capillaries to reach the body cells
- Packed with haemoglobin (pigment that absorbs the oxygen)
- No nucleus- leaves more room for haemoglobin
RED BLOOD CELLS ARE AN IMPORTANT PART OF THE BLOOD
Sperm & Egg Cells
Sperm & Egg Cells are specialised for REPRODUCTION
- Main functions of egg cell- to carry female DNA & to nourish the developing embryo in early stages.
- Contains huge food reserves to feed emrbyo
- Sperm fuses with egg, egg's membrane instantly changes its structure to stop any more sperm getting in.
- Makes sure the offspring ends up with right amount of DNA
- Function of the sperm is to get male DNA to female DNA
- Long tail & streamlined head to help swim ro egg
- Lot of mitochondria in cell to provide energy needed.
- Carry enzymes in head to digest through egg cell membrane