GCSE AQA Biology Plant Tissues, Organs & Systems: Water and carbon dioxide are exc

Water and carbon dioxide are exchanged between leaves and the atmosphere through pores called stomata - AQA - GCSE Biology - Question 5 - 2022 - Paper 1

Question 5

Water and carbon dioxide are exchanged between leaves and the atmosphere through pores called stomata. **05.1** Name the cells that control the opening and closing ... show full transcript

Worked Solution & Example Answer:Water and carbon dioxide are exchanged between leaves and the atmosphere through pores called stomata - AQA - GCSE Biology - Question 5 - 2022 - Paper 1

Step 1

Name the cells that control the opening and closing of the stomata.

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Answer

The cells that control the opening and closing of the stomata are called guard cells.

Step 2

Describe two differences between the transpiration stream and translocation.

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Answer

1. The transpiration stream involves the transport of water and minerals through xylem, while translocation is the transport of dissolved sugars through phloem.

2. The transpiration stream moves substances upwards, whereas translocation moves substances bidirectionally throughout the plant.

Step 3

Which environmental conditions would cause the rate of transpiration to be greatest in a plant?

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Answer

The environmental conditions that would cause the rate of transpiration to be greatest in a plant are warm with low humidity.

Step 4

Explain how the changes in the mean width of the stomata in normal conditions are an advantage to the plant.

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Answer

The changes in the mean width of the stomata allow plants to optimize gas exchange. During the day, when photosynthesis is occurring, stomata open wider to take in more carbon dioxide, which is essential for the process. At night, when photosynthesis ceases, stomata can close partially or completely to prevent water loss, thus conserving moisture for the plant.

Water and carbon dioxide are exchanged between leaves and the atmosphere through pores called stomata - AQA - GCSE Biology - Question 5 - 2022 - Paper 1

Worked Solution & Example Answer:Water and carbon dioxide are exchanged between leaves and the atmosphere through pores called stomata - AQA - GCSE Biology - Question 5 - 2022 - Paper 1

Name the cells that control the opening and closing of the stomata.

Describe two differences between the transpiration stream and translocation.

Which environmental conditions would cause the rate of transpiration to be greatest in a plant?

Explain how the changes in the mean width of the stomata in normal conditions are an advantage to the plant.

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