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2022 BECE Integrated Science Qs & As for Serious Candidates
PART II
Answer four questions only from this part.
2.a. Define saturated solution
b. State the solvent for the following soluble substances
i. rubber
ii. oil paint
iii. Emulsion paint
iv. Alcohol
c.i Explain osmosis
ii. State two factors affect the rate of osmosis.
d.i. Give two differences between self pollinated and cross pollinated flower.
ii. State three characteristics of enzymes.
3.a.i. Define weathering.
ii. State three differences between sandy soil and clayey soil.
b.i. Write down two components of the circulatory system in human.
ii. What is blood clotting.
c.i. State the law of refraction of light.
ii. Give two effects of refraction of light.
d. Define the following
i. Centripetal force
ii. Centrifugal force
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4.a.i. Explain the term …..
ii. State two properties of ……..
b.i. What are …………. methods?
ii. Mention the …………………methods.
c. Describe how you would …………………………..
5.a.i. Distinguish between ………………………………………………..
ii. State three factors …………………..
b.i. Mention any two groups of …………………………..
ii. What is ……………….?
c. State one function each of the following.
i.
ii.
d. Define …………………..
6.a. State the symbols of the following ……..
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2022 BECE Integrated Science Qs & As for Serious Candidates – SOLUTIONS/ANSWERS
QUESTION 2
(a) Saturated solution is a solution which cannot dissolve any more solute at a given
temperature in the presence of its solute. 2 marks
(b)
| Soluble substances | Solvent |
| Rubber | Benzene |
| Oil paint | Turpentine, Thinner |
| Emulsion paint | Water |
| Alcohol | Water |
0.5 mark each = 2
C(i) Osmosis is the movement of solvent molecules across a semi-permeable membrane from
dilute solution to a more concentrated solution. 2 marks
(ii) 1.Concentration gradient
2. Temperature 1 mark × 2
d (i)
| Self pollinated flower | Cross pollinated flower |
| 1. Occurs on flowers of the same plant | 1. Occurs on flowers of another plant but of the same species |
| 2. Involves only one plant | 2. Involves two or more plants of the same species |
ii.
1. Enzymes speed up chemical reaction
2. They are destroyed at extreme high temperature
3. They are specific in their reactions
4. They do not undergo any change during the reaction 1 mark × 3
QUESTION 3
a. (i) Weathering is the gradual breakdown of rocks into smaller particles by agents
| such as water, temperature, wind. (ii) | 2 marks |
READ:2022 BECE Mathematics Objective Questions With Answers (Super Mock)
| Sandy soil | Clayey soil |
| 1. Has large air spaces between particles | 1. Has very small air spaces between particles |
| 2. Water drains well | 2. Water does not drain well |
| 3. It dries out quickly | 3. It remains wet |
0.5 mark each = 3
b. (i) Blood
Heart
Blood vessels 1 mark × 2
(ii) Blood clotting is the process by which blood changes from its liquid state to a gel
as a result of platelets, red blood cell and white blood cells being trapped by
fibres formed by fibrins at the site of a cut. 2 marks
c. (i) The law of refraction states that, the incident rays and the refracted rays are on
opposite sides of the normal at a point of incidence all lie in the same plane.
2 marks
(ii) 1. Refraction f light causes materials such as stick, drinking straw etc to
appear bent when partially immersed.
2. Refraction of light causes mirage.
3. Refraction of light causes swimming pools and ponds to appear
shallower than their real depth. 1 mark × 2
d.
(i) Centripetal force is the force that keeps a body moving in a circular path.
1 mark
(ii) Centrifugal force is the force that pulls a moving body away from a central
point. 1 mark