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O Level Biology: Coordination and Control MCQs — Biology

37 multiple-choice questions on O Level Biology: Coordination and Control from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

1. The fovea is the part of the retina with

  1. the optic nerve
  2. blood vessels only
  3. the highest density of receptors
  4. no receptors

Answer: C) the highest density of receptors

Explanation: Sharpest vision at the fovea. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs

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2. Insulin and glucagon are produced by the

  1. kidneys
  2. adrenal glands
  3. liver
  4. pancreas

Answer: D) pancreas

Explanation: The pancreas secretes both. O Level Biology · Topic 14 Coordination and Control · 14.6 Blood glucose control

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3. Homeostasis is

  1. the maintenance of a constant internal environment
  2. the response of plants to light
  3. the production of hormones
  4. the removal of waste

Answer: A) the maintenance of a constant internal environment

Explanation: Definition of homeostasis. O Level Biology · Topic 14 Coordination and Control · 14.4 Homeostasis

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4. Which is an effector?

  1. The spinal cord
  2. A receptor in the skin
  3. A muscle
  4. A sensory neurone

Answer: C) A muscle

Explanation: Effectors are muscles or glands. O Level Biology · Topic 14 Coordination and Control · 14.1 Mammalian nervous system

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5. When cold, the hair erector muscles

  1. contract so hairs trap a layer of air
  2. widen the arterioles
  3. release sweat
  4. relax so hairs lie flat

Answer: A) contract so hairs trap a layer of air

Explanation: Trapped air insulates. O Level Biology · Topic 14 Coordination and Control · 14.5 Temperature control

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6. A hormone is

  1. an electrical impulse
  2. a type of neurone
  3. an enzyme in the gut
  4. a chemical made by a gland and carried in the blood to target organs

Answer: D) a chemical made by a gland and carried in the blood to target organs

Explanation: Definition of a hormone. O Level Biology · Topic 14 Coordination and Control · 14.3 Mammalian hormones

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7. Shivering warms the body because

  1. it narrows arterioles
  2. it traps air
  3. muscle contraction releases heat from respiration
  4. it reduces sweating

Answer: C) muscle contraction releases heat from respiration

Explanation: Respiration in muscles releases heat. O Level Biology · Topic 14 Coordination and Control · 14.5 Temperature control

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8. Synapses ensure that impulses

  1. stop completely
  2. travel in one direction only
  3. travel faster
  4. travel in both directions

Answer: B) travel in one direction only

Explanation: Only one side releases neurotransmitter. O Level Biology · Topic 14 Coordination and Control · 14.1 Mammalian nervous system

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9. Which is controlled by homeostasis?

  1. Body temperature
  2. Height
  3. Eye colour
  4. Blood group

Answer: A) Body temperature

Explanation: Temperature is kept constant. O Level Biology · Topic 14 Coordination and Control · 14.4 Homeostasis

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10. When the body is too hot, arterioles near the skin surface

  1. move deeper into the skin
  2. dilate so more heat is lost
  3. constrict so less heat is lost
  4. move closer to the surface

Answer: B) dilate so more heat is lost

Explanation: Vasodilation increases heat loss. O Level Biology · Topic 14 Coordination and Control · 14.5 Temperature control

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11. Which gland produces adrenaline?

  1. Adrenal gland
  2. Pancreas
  3. Pituitary gland
  4. Ovary

Answer: A) Adrenal gland

Explanation: Adrenal glands secrete adrenaline. O Level Biology · Topic 14 Coordination and Control · 14.3 Mammalian hormones

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12. Which neurone carries impulses from a receptor to the CNS?

  1. Motor neurone
  2. Effector
  3. Sensory neurone
  4. Relay neurone

Answer: C) Sensory neurone

Explanation: Sensory neurones carry impulses to the CNS. O Level Biology · Topic 14 Coordination and Control · 14.1 Mammalian nervous system

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13. Which part refracts most of the light entering the eye?

  1. Iris
  2. Optic nerve
  3. Retina
  4. Cornea

Answer: D) Cornea

Explanation: The cornea does most refraction. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs

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14. A symptom of type 1 diabetes is

  1. very slow heart rate
  2. protein in the blood
  3. glucose in the urine
  4. low blood glucose all the time

Answer: C) glucose in the urine

Explanation: High blood glucose spills into urine. O Level Biology · Topic 14 Coordination and Control · 14.6 Blood glucose control

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15. Which part of the eye contains light receptors?

  1. Retina
  2. Cornea
  3. Iris
  4. Lens

Answer: A) Retina

Explanation: The retina contains rods and cones. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs

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16. When looking at a distant object, the suspensory ligaments are

  1. slack and the lens is fat
  2. tight and the lens is thin
  3. relaxed and the lens is round
  4. cut

Answer: B) tight and the lens is thin

Explanation: Relaxed ciliary muscles pull ligaments tight. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs

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17. Which part of the eye controls how much light enters?

  1. Lens
  2. Optic nerve
  3. Retina
  4. Iris

Answer: D) Iris

Explanation: The iris changes pupil size. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs

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18. The blind spot has no receptors because

  1. the optic nerve leaves the eye there
  2. it contains only cones
  3. it is the fovea
  4. it is covered by the iris

Answer: A) the optic nerve leaves the eye there

Explanation: No rods or cones where the nerve exits. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs

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19. Testosterone is produced by the

  1. ovaries
  2. pancreas
  3. pituitary
  4. testes

Answer: D) testes

Explanation: Testes make testosterone. O Level Biology · Topic 14 Coordination and Control · 14.3 Mammalian hormones

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20. Which hormone lowers blood glucose concentration?

  1. Glucagon
  2. Adrenaline
  3. Oestrogen
  4. Insulin

Answer: D) Insulin

Explanation: Insulin lowers blood glucose. O Level Biology · Topic 14 Coordination and Control · 14.6 Blood glucose control

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21. The central nervous system consists of

  1. all neurones
  2. the spinal cord and nerves
  3. the brain and spinal cord
  4. the brain and nerves

Answer: C) the brain and spinal cord

Explanation: CNS = brain + spinal cord. O Level Biology · Topic 14 Coordination and Control · 14.1 Mammalian nervous system

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22. A person with type 1 diabetes

  1. cannot make glucagon
  2. produces too much insulin
  3. does not produce enough insulin
  4. has no liver

Answer: C) does not produce enough insulin

Explanation: Type 1 = lack of insulin. O Level Biology · Topic 14 Coordination and Control · 14.6 Blood glucose control

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23. What is the correct order in a reflex arc?

  1. receptor → sensory → relay → motor → effector
  2. effector → motor → relay → sensory → receptor
  3. receptor → motor → relay → sensory → effector
  4. relay → sensory → motor → receptor → effector

Answer: A) receptor → sensory → relay → motor → effector

Explanation: Impulse goes receptor to effector. O Level Biology · Topic 14 Coordination and Control · 14.1 Mammalian nervous system

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24. Which organ stores glucose as glycogen?

  1. Stomach
  2. Liver
  3. Kidney
  4. Pancreas

Answer: B) Liver

Explanation: The liver (and muscles) store glycogen. O Level Biology · Topic 14 Coordination and Control · 14.6 Blood glucose control

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25. Sweating cools the body because

  1. sweat stops blood flow
  2. sweat is cold
  3. evaporation of sweat removes heat from the skin
  4. sweat traps air

Answer: C) evaporation of sweat removes heat from the skin

Explanation: Evaporation takes heat energy away. O Level Biology · Topic 14 Coordination and Control · 14.5 Temperature control

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