IGCSE Co-ordinated Sciences (9–1) 0973 · Biology · 105

0654.B13.3.01 — Describe homeostasis as the maintenance of a constant internal environment: past paper questions

6 real questionsasked in 3 of the last 10 exam series2021–2024usually: Complete, State, Name

Real questions on 0654.b13.3.01 — describe homeostasis as the maintenance of a constant internal environment

The newest 6 of 6 written questions. Open one to see it on the real paper.

0973/31 · May/June 2024 · Q7c[1]
State the word that is used to describe the maintenance of a constant internal environment.
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0973/42 · May/June 2024 · Q4a[1]
Blood glucose concentration is controlled so that it remains within set limits. State the name given to this type of control.
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0973/42 · May/June 2024 · Q4e[3]
Table 4.1 compares nervous and hormonal control. Complete Table 4.1. Table 4.1 nervous control form of transmission hormonal control chemical hormones relative speed of action relative longevity of action
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0973/42 · May/June 2023 · Q1b[2]
Accommodation of the eye is an example of sensitivity. Complete the sentence to describe the term sensitivity. Sensitivity is the ability to detect or sense , which are changes in the internal or external and to make appropriate responses.
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0973/31 · October/November 2021 · Q5c[3]
A student investigates the rusting of iron nails. Fig. 5.1 shows the student’s experiments. X dry air Y Z air and water vapour air and water vapour painted nail cotton wool water water drying agent removes water vapour Fig. 5.1 Table 5.2 shows the student’s observations after one week. Complete Table 5.2 to explain the...
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0973/41 · October/November 2021 · Q10d[1]
Name one other hormone that increases the glucose concentration of the blood.
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What examiners said

Many candidates were able to complete the sentence to describe the meaning of the term sensitivity.
— Examiner report, May/June 2023, 0973/42 Q1(b) (Cambridge)

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In the syllabus

105 0654.B13.3.01 — Describe homeostasis as the maintenance of a constant internal environment

Describe homeostasis as the maintenance of a constant internal environment
Explain the concept of homeostatic control by negative feedback with reference to a set point
Describe the control of blood glucose concentration by the liver and the roles of insulin and glucagon
Identify in diagrams and images of the skin: hairs, hair erector muscles, sweat glands, receptors, sensory neurones, blood vessels and fatty tissue
Describe the maintenance of a constant internal body temperature in mammals in terms of: (a). insulation, sweating, shivering, the role of the brain (b). vasodilation and vasoconstriction of arterioles supplying skin surface capillaries

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