2018 - JAMB Biology Past Questions and Answers - page 3

21

Which of the following processes removes carbon from the atmosphere?

A
putrefaction
B
photosynthesis
C
volcanic eruption
D
burning of fuels
correct option: b
Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2
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22

Which of the following cycles involves the process of precipitation and transpiration?

A
water cycles
B
carbon cycle
C
nitrogen cycle
D
oxygen cycle
correct option: a
Water cycle involves the continuous circulation of water in the Earth-atmosphere system. The most important of this cycle are evaporation, transpiration, condensation, precipitation, and runoff.
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23

What is the critical limiting factor for plants below the photic zone in an aquatic ecosystem?

A
availability of nutrients
B
availability of water
C
intensity of light
D
carbon dioxide concentration
correct option: c
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24

Which of the following instruments is used to estimate the number of plants in a habitat?

A
pooter
B
pitfall trap
C
quadrant
D
sweep net
correct option: c
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25

Which of the following statements is true about sandy soil?

A
has limited air space
B
is light and easy to dig
C
drains slowly
D
is heavy and poorly aerated
correct option: b
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26

Which of the following organisms is a primary consumer?

A
dog
B
sheep
C
grass
D
fungus
correct option: b
Consumers are organisms that generally obtain food by feeding on another organism or organic matter. In a food chain, primary consumers are generally herbivores.
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27

Study the diagram of a food chain shown and use; it to answer the question.

P ---> Q ---> R ---> S ---> T

The organism designated P in the food chain above is normally sustained by energy from

A
sunlight
B
carbohydrates
C
green plants
D
mineral salts
correct option: a
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28

Study the diagram of a food chain shown and use; it to answer the question.

P ---> Q ---> R ---> S ---> T

Which of the following statements best describes the organism designated R? It

A
feeds on S
B
is a primary consumer
C
is a producer as well as a consumer
D
is a secondary consumer
correct option: d
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29

Which of the following diseases is not hereditary?

A
Albinism
B
Scabies
C
Haemophilla
D
Colour blindness
correct option: b
Diseases that are NOT hereditary are ones significant genetic causation can be ruled out with a high degree of confidence.
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30

The immediate product of meiosis in flowering plants is the

A
sporophyte
B
gametophyte
C
zygote
D
pollen grains
correct option: d
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