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Quiz Chapter 3: Coordination and Response

10 questions · Form 1 Science Bab 3: Coordination and Response

Question 1 of 10Score: 0

Which animal behavior aids cooling through saliva evaporation on its tongue?

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which animal behavior aids cooling through saliva evaporation on its tongue?

  1. A lizard hiding in a burrow
  2. A dog panting with its tongue hanging out
  3. A bird fluffing its feathers
  4. A snake basking on a warm rock
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Answer: B

Panting allows dogs to evaporate saliva off their tongue and respiratory tract, lowering their core body temperature.

2. Why do guard cells close stomata during periods of extreme heat or drought?

  1. To increase rate of photosynthesis
  2. To prevent excessive water loss via transpiration
  3. To absorb more carbon dioxide
  4. To release stored oxygen rapidly
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Answer: B

Closing stomata prevents water vapor from escaping, protecting the plant from severe dehydration.

3. Which cell structure directly controls the opening and closing of a stomatal pore in plant leaves?

  1. Epidermal cells
  2. Guard cells
  3. Xylem vessels
  4. Spongy mesophyll cells
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Answer: B

A pair of specialized guard cells flanking each stomatal pore alter their turgor pressure to open or close it.

4. Which organ in the human excretory system regulates both water and mineral salt levels in the blood?

  1. Lungs
  2. Kidneys
  3. Heart
  4. Stomach
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Answer: B

Kidneys filter blood and adjust the reabsorption of water and salts to maintain osmotic balance.

5. What is the primary role of hair standing upright when erector muscles contract in cold weather?

  1. Allows sweat to evaporate faster
  2. Traps a layer of stationary warm air above the skin
  3. Reflects cold sunlight away from the skin
  4. Increases surface area for heat radiation
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Answer: B

Upright hair traps a boundary layer of warm air next to the skin, serving as an insulating barrier against heat loss.

6. Why is homeostasis vital for cellular enzyme function in the human body?

  1. Enzymes function best under stable temperature and pH conditions
  2. Enzymes are destroyed when water levels increase slightly
  3. Enzymes only operate when body temperature reaches 50°C
  4. Enzymes convert water into carbon dioxide directly
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Answer: A

Enzymes are sensitive biological catalysts; extreme changes in temperature or pH reduce their activity or cause denaturation.

7. Which hormone is released by the brain to increase water reabsorption in the kidneys during dehydration?

  1. Insulin
  2. Anti-diuretic hormone (ADH)
  3. Adrenaline
  4. Thyroxine
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Answer: B

Anti-diuretic hormone (ADH) signals the kidneys to reabsorb more water back into the bloodstream.

8. What change in metabolic rate occurs when human body temperature drops below normal?

  1. Metabolic rate decreases to save energy
  2. Metabolic rate increases to produce additional heat energy
  3. Metabolic rate drops to zero immediately
  4. Metabolic rate stays identical regardless of temperature
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Answer: B

Increased metabolic activity breaks down nutrients faster, generating thermal energy to raise body temperature.

9. How do kidneys respond when body water levels are excessively high?

  1. Reabsorb more water and produce concentrated urine
  2. Produce a larger volume of dilute urine
  3. Stop urine production completely
  4. Excrete pure salt crystals
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Answer: B

When surplus water is present, less water is reabsorbed by the kidneys, resulting in a large volume of light, dilute urine.

10. How does a cold-blooded animal like a reptile regulate its body temperature?

  1. By sweating profusely through specialized skin pores
  2. By behavioral means such as basking in sunlight or seeking shade
  3. By shivering continuously throughout the night
  4. By altering its metabolic rate using sweat glands
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Answer: B

Ectotherms (cold-blooded animals) rely on external heat sources, moving between sunny spots and shade to manage body temperature.

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