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B2: Quiz 21 – Answers
B2: Quiz 21 – Answers
1) A is a stoma (stomata) and B are the guard cells
2) The stomata are usually found on the bottom of leaves because the bottom of leaves are cooler as they are exposed to less sunlight. A cooler temperature means that the water molecules have less kinetic energy, which means that the diffusion of water/ transpiration happens at a lower rate when the stomata are on the bottom of leaves compared to if they were on the top of leaves. So, the stomata being on the bottom of leaves reduces the amount of water loss/ transpiration
3)
a)
i) Flaccid
ii) Turgid
b)
i) Large
ii) Small
c)
i) A
ii) B
4) The stomata are larger during the day because there is a greater light intensity during the day. This greater light intensity means that more photosynthesis reactions take place, which requires more carbon dioxide. The guard cells change shape to increase the size of the stomata, which allows more carbon dioxide to enter the leaves, thus allowing more photosynthesis reactions to take place
2) The stomata are usually found on the bottom of leaves because the bottom of leaves are cooler as they are exposed to less sunlight. A cooler temperature means that the water molecules have less kinetic energy, which means that the diffusion of water/ transpiration happens at a lower rate when the stomata are on the bottom of leaves compared to if they were on the top of leaves. So, the stomata being on the bottom of leaves reduces the amount of water loss/ transpiration
3)
a)
i) Flaccid
ii) Turgid
b)
i) Large
ii) Small
c)
i) A
ii) B
4) The stomata are larger during the day because there is a greater light intensity during the day. This greater light intensity means that more photosynthesis reactions take place, which requires more carbon dioxide. The guard cells change shape to increase the size of the stomata, which allows more carbon dioxide to enter the leaves, thus allowing more photosynthesis reactions to take place
Questions
1) What is the name of structures A and B on the diagram below.
1) What is the name of structures A and B on the diagram below.
2) Are the majority of the stomata found on the top or on the bottom of leaves? Explain why the stomata are found where they are found.
3) The guard cells change shape depending on the amount of water that they contain.
a)
i) If the guard cells are short of water, would they be turgid or flaccid?
ii) If the guard cells have plenty of water, would they be turgid or flaccid?
b)
i) Are the stomata small or large when the guard cells are turgid?
ii) Are the stomata small or large when the guard cells are flaccid?
c) There are two diagrams below of the stomata with different shaped guard cells.
Out of the two diagrams above (A and B),
i) which one shows the guard cells being turgid?
ii) which one shows the guard cells being flaccid?
4) Are the stomata larger during the day or at night? Explain your answer.
i) which one shows the guard cells being turgid?
ii) which one shows the guard cells being flaccid?
4) Are the stomata larger during the day or at night? Explain your answer.