BECE MOCK 3
NAME:……………………………………………………
SEPTEMBER 2020
INDEX NUMBER:……………………………………….
INTEGRATED SCIENCE 2
ESSAY
1 HOUR 15 MINUTES
Paper 2
100 MARKS
This paper is in two sections, A and B. Answer Question 1 in Section A and any other four Questions in Section
B. Answer all questions in your answer booklet.
Credit will be given for clarity of expression and orderly presentation for material.
Section A
(40 marks)
Answer all of Question 1
1. (a) A farmer used the crops A, B, C and D illustrated in the figure below in a crop rotation programme in
his backyard garden for four successive growing seasons.
A
i.
ii.
iii.
iv.
v.
B
C
D
Identify each of the crops A, B, C and D in the figure above.
Draw a table to give a possible sequence of the crops during the four growing seasons.
Explain the importance of crops B in the cropping programme.
Give one advantage the farmer is likely to gain by adopting the crop rotation programme.
State four crop pest that can attack crops A, B, C, and D, and mention one method of controlling
these crop pest
(b) A student sat near a pool and saw a coin in the pool, he observed that the coin was not in it position
when he entered the pool. Study the diagram carefully and answer the questions that follow.
i.
ii.
iii.
What phenomenon does the diagram illustrate?
Explain why the coin at the bottom of the pond appears closer to the surface than it actual.
State other two conditions the phenomenon mentioned in (i) above help explain.
(c) The diagram below shows the set up of an experiment in which a student added some quantity of
hydrochloric acid to some quantity of sodium hydroxide solution of the same concentration.
i.
ii.
iii.
Name the parts labeled I, II, III and IV.
Mention one instrument that could be used to transfer the hydrochloric acid solution into II.
What is the name of the reaction that occurred between the dilute hydrochloric acid and sodium
hydroxide solution?
What is the name of the compound that would left in an evaporating dish if the liquid mixture III is
heated?
iv.
(d) Study the diagrams below carefully and answer the questions that follow.
IV
III
II
i.
ii.
iii.
iv.
A
I
B
Identify A and B.
Name the parts labeled I, II, III and IV.
What occurs when A and B fuses to form a zygote?
Explain briefly how a baby is formed.
Section B
(60 MARKS)
Answer four questions only from this section
2. a. i. What is matter?
ii. List the three particles which make up matter.
b. i. Name the two elements that combines to form water.
ii. Write a balanced chemical equation to show how the water is formed from the named elements.
c. i. What is technology?
ii. State two differences between science and technology.
d. List three components of soil.
3. a. i. What is refraction of light?
ii. Sketch a diagram to show the path of a light ray when it travels from air to glass.
b. Explain why it is difficult to separate iron from sulphur mixture after strong heating.
c. i. What is surface tension?
ii. State one application of surface tension.
d. Explain how oxygen (air) gets into the lungs of human.
4. a. Explain briefly the following.
i.
Force
ii.
Cohesion
iii.
Adhesion
iv.
Capillarity
b. Explain why water wets glass and mercury does not.
c. A machine was used to lift a load of 30N through a distance of 2m. The effort applied was 10N, through
a distance of 8m. Calculate the following
i.
ii.
iii.
iv.
v.
the mechanical advantage of the machine.
the velocity ratio of the machine.
the work input of the machine.
the work output of the machine.
the efficiency of the machine.
d. Write a well balanced chemical equation for photosynthesis.
5. a. i. Define blood vessels.
ii. State the three types of blood vessels.
b. A man wearing a pair of shoes that have flat heels exerts less pressure on the ground than a lady of the
same weight wearing high heels, why?
c. i. What is soil moisture?
ii. State two importance of soil water.
d. i. What is a molecule?
ii. Give two examples of a molecule.
6. a. Define the following
i.
pest
ii.
parasite
iii.
host
iv.
ectoparasite
v.
endoparasite
b. i. What is climate?
ii. State all the elements of climate.
c.
Differentiate between a solvent and a solute with an example each.
d.
Explain why ships float on water.