26. FSH and LH are made by the
- pituitary gland
- adrenal glands
- ovaries
- pancreas
Answer: A) pituitary gland
Explanation: The pituitary secretes FSH and LH. O Level Biology · Topic 14 Coordination and Control · 14.3 Mammalian hormones
MCQs / Biology / O Level Biology: Coordination and Control
O Level Biology: Coordination and Control MCQs — Biology (page 2)
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.
27. When focusing on a near object,
- suspensory ligaments tighten
- ciliary muscles relax and the lens becomes thinner
- the iris closes
- ciliary muscles contract and the lens becomes fatter
Answer: D) ciliary muscles contract and the lens becomes fatter
Explanation: Near focus needs a thick, more convex lens. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs
28. Negative feedback means
- a change from the set point causes a response that returns it to normal
- the set point keeps changing
- hormones are not involved
- a change causes more of the same change
Answer: A) a change from the set point causes a response that returns it to normal
Explanation: Negative feedback reverses changes. O Level Biology · Topic 14 Coordination and Control · 14.4 Homeostasis
29. Compared with nervous control, hormonal control is
- faster and longer-lasting
- faster and shorter
- slower and longer-lasting
- slower and shorter
Answer: C) slower and longer-lasting
Explanation: Hormones act slowly but last longer. O Level Biology · Topic 14 Coordination and Control · 14.3 Mammalian hormones
30. Which part of the brain monitors and controls body temperature?
- Hypothalamus
- Pituitary gland
- Cerebellum
- Cerebrum
Answer: A) Hypothalamus
Explanation: The hypothalamus is the thermoregulatory centre. O Level Biology · Topic 14 Coordination and Control · 14.5 Temperature control
31. When blood glucose is low, glucagon causes the liver to
- convert glucose to glycogen
- store fat
- make insulin
- convert glycogen to glucose
Answer: D) convert glycogen to glucose
Explanation: Glucagon raises blood glucose. O Level Biology · Topic 14 Coordination and Control · 14.6 Blood glucose control
32. Fatty tissue under the skin helps maintain body temperature by
- making hormones
- detecting temperature
- producing sweat
- providing insulation
Answer: D) providing insulation
Explanation: Fat reduces heat loss. O Level Biology · Topic 14 Coordination and Control · 14.5 Temperature control
33. A reflex action is
- a learned response
- a hormonal response
- a rapid, automatic response to a stimulus
- a slow, conscious decision
Answer: C) a rapid, automatic response to a stimulus
Explanation: Reflexes are fast and involuntary. O Level Biology · Topic 14 Coordination and Control · 14.1 Mammalian nervous system
34. Type 1 diabetes is treated by
- injecting glucagon
- removing the pancreas
- eating more sugar
- injecting insulin
Answer: D) injecting insulin
Explanation: Insulin replaces the missing hormone. O Level Biology · Topic 14 Coordination and Control · 14.6 Blood glucose control
35. In bright light, the pupil becomes smaller because
- ciliary muscles contract
- radial muscles contract
- suspensory ligaments tighten
- circular muscles of the iris contract
Answer: D) circular muscles of the iris contract
Explanation: Circular muscle contraction constricts the pupil. O Level Biology · Topic 14 Coordination and Control · 14.2 Mammalian sense organs
36. At a synapse, the neurotransmitter
- travels as an electrical impulse across the gap
- binds to vesicles in the first neurone
- diffuses across the gap and binds to receptor proteins
- is made by the second neurone
Answer: C) diffuses across the gap and binds to receptor proteins
Explanation: Neurotransmitters diffuse and bind to receptors. O Level Biology · Topic 14 Coordination and Control · 14.1 Mammalian nervous system
37. Adrenaline increases
- insulin release only
- heart rate and blood glucose
- digestion
- sleep
Answer: B) heart rate and blood glucose
Explanation: Fight or flight effects. O Level Biology · Topic 14 Coordination and Control · 14.3 Mammalian hormones
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