CIE iGCSE Co-Ordinated Science B13.2 Hormones Exam Style Questions Paper 1
Question
A student is in a dangerous situation and adrenaline is released into the blood. The table shows changes to pulse rate, breathing rate, and pupil diameter.
Which row correctly describes the effect of adrenaline?
▶️Answer/Explanation
Answer: C
Explanation: Adrenaline increases the pulse rate, breathing rate, and pupil diameter as part of the “fight or flight” response to prepare the body for action.
Question
A student wrote some notes about hormones. She wrote: ‘A hormone is produced by a ……1…… . It is transported in the blood ……2…… . It alters the activity of one or more ……3…… organs.’
Which row correctly completes gaps 1, 2 and 3?
A. 1: gland, 2: cells, 3: specific
B. 1: gland, 2: plasma, 3: target
C. 1: tissue, 2: cells, 3: specific
D. 1: tissue, 2: plasma, 3: target
▶️Answer/Explanation
Answer: B. 1: gland, 2: plasma, 3: target
Explanation: Hormones are chemical messengers produced by glands and transported in the blood plasma. They act on specific target organs to regulate various physiological processes.
Question
Adrenaline is injected into the blood to treat some medical conditions. What would happen as a result of injecting adrenaline?
- 1. narrowing of the pupil in the eye
- 2. increased breathing rate
- 3. increased pulse rate
- A. 1 and 2 only
- B. 1 and 3 only
- C. 2 and 3 only
- D. 1, 2 and 3
▶️Answer/Explanation
Answer: C. 2 and 3 only
Explanation: Adrenaline increases the breathing rate and pulse rate to prepare the body for a “fight or flight” response. It does not cause the pupil to narrow; instead, it causes the pupil to dilate.
Question
What is a hormone?
A a chemical substance, produced by a gland, which alters the activity of target organs
B a protein that acts as a biological catalyst
C a thread-like structure of DNA, carrying genetic information in the form of genes
D an electrical signal that travels along a nerve cell to an effector
▶️Answer/Explanation
Ans :A
Question
Which row shows a person’s response to a ‘fight or flight’ situation?
▶️Answer/Explanation
Ans: D
Question
What are the effects of adrenaline?
▶️Answer/Explanation
Ans : D
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
Ans : C
Question
Which row about hormones is correct?
▶️Answer/Explanation
Ans: C
Question
The graph shows the pulse rate over a period of time.
At which point was adrenaline released into the blood?
▶️Answer/Explanation
Answer: A. A
Explanation: Adrenaline is a hormone that increases the pulse rate. In the graph, the pulse rate spikes at point A, indicating that adrenaline was released into the blood at this point.