2012 - WAEC Biology Past Questions and Answers - page 3
21
When fertilization occurs that leads to formation of a zygote, which of the following processes takes place?
A
The tail of the sperm fuses with the egg cell
B
Both tail and head of the sperm fuse with the egg cell
C
The nucleus of the sperm fuses with the egg cell
D
The egg cell develops on its own without the sperm
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Which of the following structures in a flower develops into the seed?
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An illustration of a human male reproductive system is shown above. Which
of the labelled parts can be cut to-ensure permanent sterility?
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The brightly coloured petals in some plants is an adaptive colouration for
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Squirrels easily kill some trees because
A
they inject poisonous substances into the trees.
B
most trees are susceptible to squirrel bites
C
they feed voraciously on the roots
D
they gnaw the bark and destroy
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The major role played by accessory pigments during photosynthesis is
the phloem.
to
A
add colour to plants but not to trap light energy
B
trap light energy that chlorophyll cannot absorb
C
transfer energy from chlorophyll to other pigments
D
prevent chlorophyll from absorbing unnecessary light
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The main raw materials required for photosynthesis are
B
oxygen and carbon dioxide.
D
carbon dioxide and water
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What is the benefit of thunder and lightning to farmers?
A
Addition of nitrates to the soil
C
Removal of harmful bacteria from the soil
D
Addition of rain water to the soil
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Which of the following substances must be present in the soil for growth of a healthy green plant?
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The purpose of proteins in the diet of a mammal is to
A
promote growth and repair cells
C
regulate the flow of chyme
D
serve as co-factors or enzymes
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