OCR Gateway GCSE Biology: Combined Science

Topic Questions

GCSEBiology: Combined ScienceOCR GatewayTopic Questions3. Organism Level Systems3.3 Maintaining Internal Environments

3.3 Maintaining Internal Environments

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1a
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(i)
Diabetes occurs when blood sugar levels are not controlled.

Which hormone reduces blood sugar levels?

 [1]

(ii)
Hormones are produced in endocrine glands.

Describe how hormones control different parts of the body.

 [2]

(iii)

A glucose tolerance test can help identify if a person has diabetes.

The graphs show a glucose tolerance test in three people A, B, and C.q20aiii1-paper1f-june2019-ocrgcsebioocr-gateway-gcse---glucoregulation-graph
One person is healthy and the other two people have different types of diabetes.

Explain the differences between the three graphs and describe how each person with diabetes could control their blood glucose levels.

Use information from the graphs in your answer.

 [6]

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1b
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Drugs can be used to treat one type of diabetes. One drug prevents an enzyme working properly.

Suggest how a drug can stop an enzyme working.

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2a
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Fig. 20.1 shows a section through the skin on the back of the hand.

fig-20-1-paper1f-nov2020-ocrgcsebio

Fig. 20.1

(i)
Which part of the skin detects something touching the back of the hand?
[1]
(ii)
The body responds when something touches the back of the hand.

Complete the sentences to explain how this happens.

The ..................................... receives impulses from the skin along sensory neurones.

These impulses are processed and other impulses are sent along ..................................... neurones to bring about responses.
[2]

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2b
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The skin on some areas of the body contains hairs. Modern hair shampoos contain cleaning agents. One cleaning agent is made from fatty acids.

Explain how a polymer found in plants and animals can be treated to obtain these fatty acids.

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2c
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(i)

The skin is important for controlling body temperature.

Explain why overheating of the body may stop chemical reactions in cells.

[2]

(ii)

Look at Fig. 20.2 which shows two people riding on boards.

Person A is riding a board on sand in a hot desert. Person B is riding a board on snow.
z105yJgC_fig-20-2-paper1f-nov2020-ocrgcsebio
Fig. 20.2


Explain the different problems of temperature regulation for these two people and give examples of the ways their bodies solve these problems.

[6]

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