iGCSE Biology (0610)-14.4 Homeostasis - iGCSE Style Questions Paper 3

Question

(a) The human body must maintain a constant internal environment.
(i) State the term used to describe the maintenance of a constant internal environment.

(ii) Secretion of hormones by endocrine glands is one way that a constant internal environment is maintained.
Fig. 7.1 shows the locations of some endocrine glands and some organs in the human body.

Table 7.1 shows some of the names of the endocrine glands, the hormones they secrete, their functions and their letters from Fig. 7.1.

(b) State how hormones secreted by an endocrine gland reach their target organ.

(c) (i) The nervous system also helps the body to maintain a constant internal environment. Complete Table 7.2 to compare nervous and hormonal control

(ii) State one type of neurone found in a reflex arc.

▶️ Answer/Explanation

Solution

Ans:

(a)(i) Homeostasis – the process by which the body maintains a stable internal environment despite external changes.

(a)(ii) The completed table matches endocrine glands (e.g., pancreas, adrenal glands) with their hormones (insulin, adrenaline) and functions (regulating blood sugar, fight-or-flight response).

(b) Hormones travel through the bloodstream to reach their target organs.

(c)(i) Nervous control is fast and short-lived (e.g., reflexes), while hormonal control is slower but longer-lasting (e.g., growth regulation).

(c)(ii) Sensory, relay, or motor neurones are found in a reflex arc, transmitting signals rapidly for quick responses.

Question

The boxes on the left contain the names of some processes taking place in living organisms.
The boxes on the right contain descriptions of these processes.
Draw one straight line from each box on the left to a box on the right to link the name of the
process with its description.
An example has been done for you.

Answer/Explanation

Ans

iGCSE Biology (0610)-14.4 Homeostasis – iGCSE Style Questions Paper 3

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