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CAIE IGCSE Biology 14 Coordination and Response Questions

Review nervous and hormonal coordination, sense organs, homeostasis and tropic responses through diagrams and experimental data.

Syllabus
2026–2028
Course
Biology 0610

Covered syllabus points

14.1 Coordination and response14.2 Sense organs14.3 Hormones14.4 Homeostasis14.5 Tropic responses

Question 1

[Maximum number: 1]

Heart rate is influenced by electrical impulses from the brain.

State the name of the type of cell that conducts electrical impulses to the heart.

Question 2

[Maximum number: 12]

The eye is a sense organ that is part of the nervous system.

Question (a)

(a)

Explain why the eye can be described as a sense organ.

[ 2 ]

Question (b)

(b)

State the two parts of the central nervous system.

1
2

[ 2 ]

Question (c)

(c)

Fig. 5.1 is a diagram of a section through the human eye.

Fig. 5.1

Fig. 5.1

[ 4 ]

Question (i)

(i)

Draw an X on Fig. 5.1 to identify the blind spot.

[ 1 ]

Question (ii)

(ii)

Table 5.1 shows some of the parts labelled in Fig. 5.1, their names and their functions.

Complete Table 5.1.

Table 5.1

Table 5.1

[ 3 ]

Question (d)

(d)

State the names of the two effectors that contract and relax during the pupil reflex. and

[ 1 ]

Question (e)

(e)

Explain why a person is unable to focus on distant objects if the suspensory ligaments become permanently overstretched.

[ 3 ]

Question 3

[Maximum number: 9]

Insulin is a hormone that regulates the concentration of glucose in the blood.

Question (a)

(a)

Describe what is meant by the term hormone.

[ 3 ]

Question (b)

(b)

Person A and person B were monitored to see how well they could control their blood glucose concentration.

They did not eat or drink anything other than water for eight hours before the monitoring began. They then drank a glucose solution.

Blood samples were taken at 30 -minute intervals.
The blood samples were tested for glucose concentration.
The results are shown in Fig. 2.1.
blood glucose concentration
/ mg per 100 cm3100 \mathrm{~cm}^{3}

Fig. 2.1

Fig. 2.1

[ 6 ]

Question (i)

(i)

Using Fig. 2.1, explain the response of person B after 90 minutes.

[ 4 ]

Question (ii)

(ii)

Person A had Type 1 diabetes.

Outline the treatment of Type 1 diabetes.

[ 2 ]

Question 4

[Maximum number: 4]

The kidneys filter blood, separate useful molecules from excretory wastes and control the water content of the blood.

Fig. 2.1 is a diagram of a kidney tubule and associated blood vessels. The arrows show the direction of blood flow.

Fig. 2.2 is a drawing of a vertical section through a cell from the lining of region 2 of the tubule.

Fig. 2.1

Fig. 2.1

Fig. 2.2

Fig. 2.2

Question (a)

(a)

The kidneys are examples of organs that help the body to maintain a constant internal environment.

[ 4 ]

Question (i)

(i)

State the term for maintaining a constant internal environment by negative feedback.

[ 1 ]

Question (ii)

(ii)

Explain how negative feedback controls the blood glucose concentration of a person who has not eaten for a day.

[ 3 ]
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