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CIE iGCSE Co-Ordinated Science B13.2 Hormones Exam Style Questions Paper 1

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Question

Which row shows effects of adrenaline?

▶️ Answer/Explanation
Adrenaline is released during ‘fight or flight’ situations. Its effects include increasing the heart rate to pump more oxygen to muscles, and increasing pupil diameter to allow more light to enter the eyes for better vision. Both these effects prepare the body for action.
✅ Answer: (A)

Question

Which row shows the effect of adrenaline?

▶️ Answer/Explanation
Adrenaline prepares the body for ‘fight or flight’ by increasing heart rate to deliver more oxygen to muscles and widening the pupils to allow more light into the eyes for better vision. Therefore, both effects match row D, which shows pupil diameter widens and heart rate increases.
✅ Answer: (D)

Question

Which activities increase the secretion of adrenaline in the human body?

▶️ Answer/Explanation
Adrenaline is released by the adrenal glands in stressful or “fight or flight” situations such as fear, excitement or danger.
Calm, routine activities with no element of stress or excitement do not trigger extra adrenaline release.
The correct activities are those representing sudden stress, excitement or danger, matching the listed option.
✅ Answer: (A)

Question

Which row about hormones is correct?

▶️ Answer/Explanation
Hormones are chemical messengers released by glands and carried in the blood to a target organ.
Each correct row must match a named hormone with both its true gland of secretion and its true effect on the body.
Checking each row against known hormone facts, such as insulin from the pancreas lowering blood glucose, identifies the only fully correct combination.
✅ Answer: (C)

Question

One response to a frightening situation is an increase in heart rate caused by the release of adrenaline.

Which statement about adrenaline is correct?

A. It is an enzyme produced by an organ and travels in the blood to the heart.
B. It is an enzyme produced by an organ and travels down a nerve to the brain.
C. It is a hormone produced by a gland and travels in the blood to the heart.
D. It is a hormone produced by a gland and travels down a nerve to the brain.

▶️ Answer/Explanation
Adrenaline is a hormone, not an enzyme, so it is secreted by a gland (the adrenal gland) rather than being produced by an organ as an enzyme.
Hormones travel to their target organs in the bloodstream rather than along nerves.
Adrenaline travels in the blood to the heart, where it increases heart rate.
✅ Answer: (C)
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