arrow_backBack to Study Resources

Quiz Chapter 3: Coordination and Response

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

10 questions · plays in fullscreen

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

  1. Lungs
  2. Kidneys
  3. Heart
  4. Stomach
Show answer

Answer: B

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

2. 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
Show answer

Answer: B

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

3. What is the primary scientific term for the maintenance of a stable internal environment in an organism?

  1. Metabolism
  2. Transpiration
  3. Homeostasis
  4. Photosynthesis
Show answer

Answer: C

Homeostasis refers to mechanisms that maintain internal equilibrium despite external fluctuations.

4. 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
Show answer

Answer: B

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

5. What effect does vasodilation (dilation of blood vessels) near the skin surface have on the body?

  1. Decreases blood flow to conserve heat
  2. Increases blood flow to release heat into the surroundings
  3. Prevents sweating from occurring
  4. Triggers rapid shivering of skeletal muscles
Show answer

Answer: B

Widening of surface capillaries allows more warm blood to pass near the cooler outer skin, radiating heat outward.

6. Which of the following describes an internal factor regulated by homeostasis in humans?

  1. Surrounding air temperature
  2. Blood glucose level
  3. Sunlight intensity
  4. Wind speed
Show answer

Answer: B

Internal factors regulated include blood glucose, body temperature, water content, and blood pH.

7. Process by which plants lose water vapor through open stomata into the atmosphere is called:

  1. Respiration
  2. Photosynthesis
  3. Transpiration
  4. Osmosis
Show answer

Answer: C

Transpiration is the evaporation of water from plant leaves through open stomatal pores.

8. 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
Show answer

Answer: A

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

9. How do cats utilize behavioral homeostasis to cool down on hot days?

  1. Licking their fur to allow cooling by saliva evaporation
  2. Basking on hot concrete pavements
  3. Drinking salt water from puddles
  4. Panting continuously like dogs
Show answer

Answer: A

Cats coat their fur with saliva, which absorbs body heat as it evaporates into the surrounding air.

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
Show answer

Answer: B

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

Sponsored