This document contains 2022

AQA A LEVEL BIOLOGY Paper 1 7402/1 ( June 2022 )

Question Paper + Mark Scheme

Answer all questions in the spaces provided. box

0 1 . 1 Describe the structure and function of the nucleus.

[4 marks]

Question 1 continues on the next page

4

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IB/M/Jun22/7402/1

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outside the

box 0 1 . 2 Name the main polymer that forms the following cell walls.

[1 mark]

Plant cell wall

Fungal cell wall

Scientists investigated the effect of the number of fungal species in soil on the

diversity of plant species.

Table 1 shows their raw data for soil containing 14 fungal species.

Table 1

Plant species Total shoot biomass / g m–2

Poa compressa 2

Achillea millefolium 4

Aster cordifolius 5

Aster novae-angliae 7

Chrysanthemum leucanthemum 15

Daucus carota 36

Fragaria virginiana 51

0 1 . 3 Suggest one reason the scientists used biomass instead of the number of individuals

of each plant species when collecting data to measure diversity.

[1 mark]

5

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IB/M/Jun22/7402/1

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outside the

box 0 1 . 4 The scientists used this equation to calculate the plant species index of diversity.

???????? = 1 −��

????????

????????�

2

where n = shoot biomass of each plant species

and N = total shoot biomass of all plant species

Use this equation to calculate the index of diversity for the data in Table 1