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 stomata to allow diffusion of A carbon dioxide into the leaf for photosynthesis B light into the leaf for photosynthesis C oxygen into the leaf for photosynthesis D nitrogen into the leaf to make nitrates (i) (ii) Suggest the benefits to a plant of having different numbers of chloroplasts in different types of cells in the leaf.

GCSE Edexcel Biology Photosynthesis: The diagram shows a section thro

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.

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Answer

The correct answer is A: carbon dioxide into the leaf for photosynthesis. Carbon dioxide is essential for the process of photosynthesis, allowing plants to synthesize food.

Step 2

Suggest the benefits to a plant of having different numbers of chloroplasts in different types of cells in the leaf.

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Answer

Chloroplasts in mesophyll cells: Having more chloroplasts in spongy or palisade cells means that more light can be absorbed, enhancing photosynthesis.
Variation in chloroplast distribution: Different types of cells can maximize photosynthesis efficiency by optimizing light capture based on their position in the leaf.
Adaptation to light conditions: Chloroplasts may be more numerous in areas of the leaf that receive more light, while cells in shaded areas have fewer, allowing for specialized functions.
Guard cells: Chloroplasts in guard cells help regulate the opening and closing of stomata, thereby controlling gas exchange and water loss.

The diagram shows a section through a leaf - Edexcel - GCSE Biology - Question 6 - 2016 - Paper 1

Worked Solution & Example Answer:The diagram shows a section through a leaf - Edexcel - GCSE Biology - Question 6 - 2016 - Paper 1

Complete the sentence by putting a cross (X) in the box next to your answer.

Suggest the benefits to a plant of having different numbers of chloroplasts in different types of cells in the leaf.

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