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The diagram shows a section through a leaf - Edexcel - GCSE Biology - Question 6 - 2016 - Paper 1
Question 6
The diagram shows a section through a leaf. (a) Complete the sentence by putting a cross (X) in the box next to your answer. During the day, guard cells open stoma... show full transcript
Worked Solution & Example Answer:The diagram shows a section through a leaf - Edexcel - GCSE Biology - Question 6 - 2016 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
Answer
The correct answer is A: carbon dioxide into the leaf for photosynthesis. Carbon dioxide is essential for the process of photosynthesis as it is one of the primary reactants needed to produce glucose and oxygen.
Step 2
Suggest the benefits to a plant of having different numbers of chloroplasts in different types of cells in the leaf.
Answer
Having different numbers of chloroplasts in various cells maximizes the efficiency of photosynthesis.
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Chloroplasts absorb light: More chloroplasts in cells exposed to sunlight enhances light absorption, leading to more energy for photosynthesis.
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Location of chloroplasts: Chloroplasts are more concentrated at the top of the leaf, allowing for optimal light exposure, while fewer are located in the lower layers to minimize light blockage.
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Adaptation to cell type: Different cells, such as palisade and spongy mesophyll, serve distinct roles. Palisade cells, which have more chloroplasts, are the primary site for photosynthesis, while spongy mesophyll aids gas exchange and accommodates for any shade.
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Guard cells: Chloroplasts in guard cells help regulate stomatal opening, controlling gas exchange while minimizing water loss. This adaptability supports survival in varying light conditions.