Stomata are found on the surface of leaves. The diagram shows some of the surface cells of a leaf. (a) (i) Write down the name of the cell labelled X. (ii) Describe two functions of stomata. (i) The diameter of the nucleus in the diagram is 10 millimetres. The actual size of the nucleus is 10 micrometres. Calculate the magnification of the diagram.

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Stomata are found on the surface of leaves - OCR Gateway - GCSE Biology - Question 17 - 2018 - Paper 1

Question 17

Stomata are found on the surface of leaves. The diagram shows some of the surface cells of a leaf. (a) (i) Write down the name of the cell labelled X. (ii) Descri... show full transcript

Worked Solution & Example Answer:Stomata are found on the surface of leaves - OCR Gateway - GCSE Biology - Question 17 - 2018 - Paper 1

Step 1

Write down the name of the cell labelled X.

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Answer

The cell labelled X is the guard cell.

Step 2

Describe two functions of stomata.

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Answer

Stomata allow for gaseous exchange, facilitating the uptake of carbon dioxide (CO₂) and the release of oxygen (O₂).
Stomata help regulate water loss through transpiration, which is essential for maintaining plant hydration.

Step 3

Calculate the magnification of the diagram.

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Answer

The formula for magnification is given by:

$ext{Magnification} = \frac{ ext{Size in the diagram}}{ ext{Actual size}}$

Substituting the values:

$ext{Magnification} = \frac{10 \text{ mm}}{10 \text{ μm}} = \frac{10,000 \text{ μm}}{10 \text{ μm}} = 1000\text{ times}$

Thus, the magnification of the diagram is 1000 times.

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Stomata are found on the surface of leaves - OCR Gateway - GCSE Biology - Question 17 - 2018 - Paper 1

Worked Solution & Example Answer:Stomata are found on the surface of leaves - OCR Gateway - GCSE Biology - Question 17 - 2018 - Paper 1

Write down the name of the cell labelled X.

Describe two functions of stomata.

Calculate the magnification of the diagram.

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