B2 - Specialised Cells Flashcards
How does being full of chloroplasts help a palisade cell?
They are at the top of the leaf so are closer to the light.
Why does being tall help a palisade cell?
There is a larger surface area to absorb
more CO2.
Why does being thin help a palisade cell?
You can pack lots in the top of the leaf.
How does the shape of a guard cell help it?
It helps to open & close the stomata.
What happens to the guard cells when a plant is full of water?
They become turgid and open the stomata for gaseous exchange.
What happens to the guard cells when a plant has no water?
They become flaccid and close the stomata so no water can escape.
What are walls of the guard cells like and how does this help?
Thin so they can open/close.
How do guard cells save water?
By closing at night due to their light sensitivity.
List 3 ways in which red blood cells are specialised.
1) concave shape.
2) full of haemoglobin.
3) no nucleus.
How does a concave shape help a red blood cell? [2]
1) Larger surface area to absorb oxygen.
2) Can pass easily through capillaries.
How does being full of haemoglobin help a red blood cell?
It can absorb more oxygen.
How does having no nucleus help a red blood cell?
There is more room for haemoglobin.
List 2 ways egg cells are specialised.
1) food reserves.
2) changes membrane.
Why do egg cells have food reserves?
To nourish the embryo.
Why do egg cells change their membrane structure?
To prevent more than one sperm.
