OCR AS LEVEL BIOLOGY B (Advancing Biology) H022/02 | Biology in Depth (2022 Exam)

This document contains exam done on June 2022 OCR AS Level Biology B (Advancing Biology) H022/02 Biology in depth Question Paper. Download to score A.


Answer all the questions.

1 Fig. 1.1 shows a prepared slide of onion cells in different stages of mitosis, viewed using a light

microscope.

A

B

C

Fig. 1.1

(a) (i) Name the stages of mitosis taking place in cells A and B.

A ........................................................................................................................................

B ........................................................................................................................................

[2]

3

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 (ii) Fig. 1.2 shows a student’s drawing of the cell labelled C in Fig. 1.1.


 Fig. 1.2

 Give two improvements the student could make to their drawing.

1 ........................................................................................................................................

...........................................................................................................................................

2 ........................................................................................................................................

...........................................................................................................................................

[2]

4

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(b) Fig. 1.3 shows the cell cycle in an onion cell.


G2

G1 S

cell

growth

G2 checkpoint

G1 checkpoint

mitosis

DNA

synthesis

cell

growth

 Fig. 1.3

 Mitosis in an onion cell occurs once in 24 hours and lasts for 80 minutes.

 Metaphase takes approximately 6.5 minutes to complete.

 Calculate the percentage of the cell cycle which is spent in metaphase.

Metaphase = ...................................................... % [2]

(c) There are two main checkpoints in the cell cycle, the G1 checkpoint and the G2 checkpoint.

 Explain how each of the checkpoints can ensure the cell develops normally.

G1 .............................................................................................................................................

...................................................................................................................................................

G2 .............................................................................................................................................

...................................................................................................................................................

[2]

5

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(d) The cell cycle is controlled by proteins. These proteins can initiate apoptosis.

 Describe the sequence of events that occurs during apoptosis.

...................................................................................................................................................

...................................................................................................................................................

...................................................................................................................................................

...................................................................................................................................................

...................................................................................................................................................

...................................................................................................................................................

...................................................................................................................................................

.............................................................................................................................................. [3]

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2 Lenticels appear as small brown patches on the surface of some fruit.

A researcher wanted to investigate if water availability affected the number of lenticels on the

surface of apples.

They chose nine apple trees of one variety and watered each tree with a specific volume of water

every day for twelve weeks.

After twelve weeks they counted the total number of lenticels that developed on the surface of

one apple from each tree.

This was repeated with a second variety of apple.

Fig. 2.1 shows the number of lenticels found on the surface of the two varieties of apple.

100

0

200

400

600

800

1000

1200

200 300 400 500 600 700 800 900

Volume of water added to the tree (cm3)

Number

of lenticels

Variety 1 Variety 2

Fig. 2.1

(a) (i) Using only Fig. 2.1, what conclusions can be drawn about the effect of water availability

on lenticel number for these two varieties of apple?

...........................................................................................................................................

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...........................................................................................................................................

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...................................................................................................................................... [2

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Version LATEST 2022
Release date 2022-07-19
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Authors Qwivy.com
Pages 24
Language English
Tags OCR AS LEVEL BIOLOGY B Advancing Biology H022/02 Biology in Depth
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