Class 12 Biology · Chapter 1 · Test 3
Thermoregulation
36 MCQs
36 questions · 30 min · 36 marks
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Sample questions
The first 5 of 36. Try each one, then tap to see the answer.
Question 1
What is the primary heat source for endotherms?
- ASunlight
- BInternal metabolism
- CWarm rocks
- DConvection
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Answer: B
Endotherms generate most of their body heat through internal metabolism.
Question 2
What is the control center for human thermoregulation?
- APituitary gland
- BHypothalamus
- CAdrenal gland
- DMedulla oblongata
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Answer: B
The hypothalamus acts as the thermostat and control centre.
Question 3
Thermoregulation is the process by which organisms:
- ABalance water and solutes
- BRemove nitrogenous wastes
- CMaintain internal body temperature within a tolerable range
- DDetect changes in blood pressure
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Answer: C
Thermoregulation is the homeostatic process of keeping internal temperature within a tolerable range, regardless of the external temperature.
Question 4
If temperature falls below the enzyme optimum, what happens?
- AEnzyme-substrate collisions decrease and metabolic rates drop
- BEnzymes denature
- CEnzymes speed up
- DMembranes become fluid
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Answer: A
Lower temperature reduces enzyme-substrate collisions so metabolic rate drops.
Question 5
Temperatures well above the optimum cause enzymes to:
- AWork faster permanently
- BBecome more specific
- CBe produced in larger amounts
- DDenature and lose function permanently
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Answer: D
High temperatures denature enzymes and destroy their function.
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