2011 - WAEC Biology Past Questions and Answers - page 3
21
The testes in male mammals descend into the scrotal sac because
A
there is congestion in the lower abdomen
B
they run the risk of being destroyed
C
they need special support
D
they require a relatively low temperature
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Some animals return to water bodies to reproduce because
A
natural enemies destroy their eggs on land
B
water nourishes their embryos and their young ones
C
they are close to their ancestors and imitate them
D
the temperature on land is not suitable for the development of their embryos
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Which of the following methods is appropriate for the cultivation of cassava?
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What will be the chromosome number of the hybrid of two varieties of a plant with 36 chromosomes in the endosperm cell?
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Kreb’s cycle occurs in the
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The process whereby electrons are emitted from chlorophyll and returned to it unchanged is known as
A
non-cyclic phosphorylation
D
cyclic photophorylatlion
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Which of the following statements about photosynthesis is not true?
A
Plants can photosynthesize without an increase in dry weight
B
Carbon dioxide is absorbed by the leaves in bright light
C
oxygen is produced during photosynthesis from the breakdown of water
D
Photosynthesis occurs in green plants
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The removal of all the phloem tissues of the stem of a plant close to the root system for a long period of time is likely to
A
provide more energy to the roots
B
accumulate more starch in the roots
C
cause the underground roots to develop buds
D
cause the p ant to wither and die
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Which of the following groups of substances are not six-carbon compounds?
C
Glucose, Lactose and Pyruvate
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The conversion of glucose to starch in the leaf during the day principally
B
prevents osmotic problems
C
enables the leaf to store the starch
D
enables glucose to be used up
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