2023 BECE INTEGRATED SCIENCE ESSAY

SECTION A

[40 marks]

Answer all of Question 1.

QUESTION 1

(a)
The diagrams below are illustrations of the male and female reproductive systems for humans.
Study them carefully and answer the questions that follow.

(i) Name each of the parts labelled I, II, V, VI, VII and VIII.
[6 marks]

(ii) State the function of each of the parts labelled III, IV and VII.
[3 marks]

(iii) Name the labelled part where each of the following processes take place:
(a) Fertilization
(b) Production of sperm
(c) Ovulation
[3 marks]

(iv) Name two common infectious diseases that affect both the male and female reproductive system.
[2 marks]

SECTION B

[60 marks]

Answer four questions only from this section.

QUESTION 2

(a)
(i) What is the importance of a fuse in an electrical appliance?
(ii) State two household appliances that have fuse.
[4 marks]

(b)
(i) What is teenage pregnancy?
(ii) State two causes of teenage pregnancy.
[4 marks]

(c) State three precautions against hazards.
[3 marks]

(d)
(i) State two practices that destroy water bodies.
(ii) Give two methods of conserving water bodies.
[4 marks]

QUESTION 3

(a)
(i) What is aerobic respiration?
(ii) State the main difference between aerobic respiration and anaerobic respiration.
[3 marks]

(b)
(i) Explain the term potential difference.
(ii) The potential difference across the terminals of a 100 Ω resistor is 250 V.
Calculate the current flowing through the resistor.
[5 marks]

(c)
(i) Which crop is infected by the Swollen Shoot disease?
(ii) State the causative organism of the disease.
(iii) State the method of spread of the disease.
(iv) Give two ways of preventing the spread of the disease.
[5 marks]

(i) Write the electron configuration for Y.
(ii) State the possible ion that could be formed by X to make it more stable.
[2 marks]

QUESTION 4

(a) What is a neutralization reaction?
[2 marks]

(b) State three physical properties of a soil.
[3 marks]

(c)
(i) Define the term power.
(ii) If a machine hauls a packing case of mass 50 kg up a building that is 10 m high in 30 s, calculate the power of the machine.
( g = 10 ms^–²)
[6 marks]

(d) State four areas where technology is used for the benefit of humans.
[4 marks]

QUESTION 5

(a) State three ways in which mulching restores soil resources.
[3 marks]

(b)
(i) Name the two elements that combine to form ammonia gas.
(ii) Write a balanced chemical equation for the formation of ammonia from the elements named in (i).
[3 marks]

(c)
The following information is on the feeding habits of some organisms:
(i) man feeds on grasscutter
(ii) toad feeds on grasshopper
(iii) snake feeds on toad
(iv) goat feeds on grass
(v) man feeds on hawk
(vi) grasshopper feeds on grass
(vii) hawk feeds on snake
(viii) grasscutter feeds on grass

Use all the information given above to construct a food web.
[4 marks]

(d)
(i) What is a galaxy?
(ii) State the relationship between stars and galaxies.
(iii) Explain briefly the term milky way.
[5 marks]

QUESTION 6

(a)
(i) State three effects of soil erosion on the growth of crop plants.
(ii) Mention one method of controlling soil erosion.
[4 marks]

(b)
(i) Name two science‑related businesses.
(ii) State the principles underlying the operation of each of the businesses named in (i).
[4 marks]

(c)
(i) Explain how the female Anopheles mosquito transmits malaria to humans.
(ii) State one chemical method of controlling mosquitoes.
[4 marks]

(d)
(i) Name two fundamental units of measurement.
(ii) State the physical quantity that one of the units named in (i) measures.
[3 marks]