Free Thermoregulation MCQs with Answers
45 Thermoregulation MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Thermoregulation maintains body temperature through negative feedback controlled mainly by the hypothalamus. It covers vasodilation and vasoconstriction, sweating, shivering, changes in metabolic heat production and behavioural responses, while distinguishing heat loss by radiation, conduction, convection and evaporation from temperature regulation itself.
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45 questions · page 2 of 3
- A. Elevation of temperature in cold conditions.
- B. Embracing the enzymes and other proteins and prevent their denaturation.
- C. Change the chemical nature of other proteins thus making them heat resistant.
- D. Help in evaporative cooling.
Explanation: Heat shock proteins act as molecular chaperones during heat stress by binding to vulnerable proteins, helping them retain their functional…
Correct answer: Embracing the enzymes and other proteins and prevent their denaturation.- A. Pigmentation.
- B. Respiration.
- C. Evaporative cooling.
- D. Excretion.
Explanation: Panting increases evaporation of water from the respiratory passages, and evaporation removes heat from the body.
Correct answer: Evaporative cooling.- A. Providing insulation in cold environment.
- B. Providing insulation in hot environment
- C. Rapid heat production.
- D. Controlling heat production.Health
Explanation: Brown fat contains many mitochondria and uncoupling proteins that release energy from respiration as heat instead of storing it mainly as…
Correct answer: Rapid heat production.- A. Cerebrum
- B. Cerebellum
- C. Thalamus
- D. Hypothalamus
Explanation: The hypothalamus acts as the body's thermoregulatory centre by comparing blood temperature with a set point and coordinating sweating…
Correct answer: Hypothalamus- A. Tropical rain forest
- B. Tundra
- C. Grass land
- D. Desert
Explanation: The kangaroo rat is adapted to deserts, where it survives with very little free water by obtaining water from seeds and producing highly…
Correct answer: Desert- A. Activation of sweat glands
- B. Dilation of skin blood vessels
- C. Panting
- D. Thermogenesis
Explanation: Thermogenesis is increased heat production, such as by shivering and increased metabolic activity, and helps an animal maintain body…
Correct answer: Thermogenesis- A. Taxonomy
- B. Physiology
- C. Morphology
- D. Anatomy
Explanation: Stomatal movement involves physiological changes in guard-cell turgor that regulate gas exchange and water loss.
Correct answer: Physiology- A. Vasodilation
- B. Activation of sweat glands
- C. Thermogenesis
- D. Evaporative cooling
Explanation: At high temperature, the body reduces thermogenesis, or heat production, because producing more heat would raise body temperature further.
Correct answer: Thermogenesis- A. A
- B. B
- C. C
- D. D
Explanation: Sparrows are endothermic, meaning they generate their own body heat and maintain a relatively constant internal body temperature…
Correct answer: C- A. Convection
- B. Conduction
- C. Evaporation
- D. Radiation
Explanation: Vasodilation brings more blood and heat to the body surface, facilitating radiation and evaporative heat loss, which helps to cool the…
Correct answer: Radiation- A. Feather or fur
- B. Vasoconstriction
- C. Wind blowing across the body surface
- D. Counter current heat exchange
Explanation: Wind blowing across the body surface can increase the rate of heat exchange.
Correct answer: Wind blowing across the body surface- A. A
- B. B
- C. C
- D. D
Explanation: When the outer air temperature is higher than body temperature, the body's thermoregulatory response shifts to cooling mechanisms such as…
Correct answer: D- A. More sweating, vasoconstriction
- B. Less sweating, vasodilation
- C. Less sweating, vasoconstriction
- D. More sweating, vasodilation
Explanation: When the body is overheated, sweating and vasodilation are the primary mechanisms employed to regulate body temperature.
Correct answer: More sweating, vasodilation- A. Hypothalamus
- B. Medulla
- C. Cerebrum
- D. Pons
Explanation: Hypothalamus consists of a homeostatic thermostat in the brain as it regulates a wide spectrum of physiological functions such as hunger…
Correct answer: Hypothalamus- A. Homeostasis
- B. Natural health
- C. Strucutral adaptation
- D. Osmoregulation
Explanation: Homeostasis is the tendency of an organism or cell to regulate its internal conditions, such as the chemical composition of its body…
Correct answer: Homeostasis- A. Hormones
- B. Osmosis
- C. Homeostasis
- D. Ecology
Explanation: This is a standard answer. The maintenance of a stable/constant internal environment is called homeostasis.
Correct answer: Homeostasis- A. Thalamus
- B. Hypothalamus
- C. Pones
- D. Cerebellum
Explanation: Our internal body temperature is regulated by a part of our brain called the hypothalamus.
Correct answer: Hypothalamus- A. Kidneys
- B. Brain
- C. Lungs
- D. Liver
Explanation: The body's temperature control center is the hypothalamus which itself is part of the brain.
Correct answer: Brain39. Humans regulate their internal body temperature within a very narrow range. This is an example of?
- A. Homeostasis
- B. Evolution
- C. Genetics
- D. Metabolism
Explanation: Homeostasis refers to the body's ability to maintain a stable and balanced internal environment, despite external changes.
Correct answer: Homeostasis- A. Heterotherms
- B. Endotherms
- C. Ectotherms
- D. None of these
Explanation: Heterotherms are those animals who are capable of varying degrees of endothermic heat production but generally do not regulate their body…
Correct answer: Heterotherms