2010 - WAEC Biology Past Questions & Answers - page 3

21
The part labelled III is the
A
albumen
B
chalaza
C
yolk
D
air space
CORRECT OPTION: b
22
Which of the following statements ls true about transpiration? It is the
A
loss of water in the form of vapour from the surface of the’ leaf
B
loss of water in the form of vapour from the surface of the root
C
absorption of water in the form of vapour from the body of the pint
D
movement of water through the body of the plant.
CORRECT OPTION: a
23
Transportation of water in the xylem tissue involves the following except
A
root pressure
B
capillary action
C
transpiration pull
D
translocation
CORRECT OPTION: d
24
The following are the major reasons why the butterfly lays eggs under the surface of a leaf except to
A
shade the eggs from the direct rays of the sun.
B
protect the eggs from predators
C
protect the eggs from being washed away by rain drops
D
camouflage the eggs
CORRECT OPTION: d
25
In which of the following organic compounds is the hydrogen-oxygen ratio equal to 2:1?
A
Proteins
B
Carbohydrates
C
Lipids
D
Vitamins
CORRECT OPTION: b
26
A man suffering from obesity must avoid meals containing
A
margarine and butter
B
rice and beans
C
carrots and oranges
D
beef and fish
CORRECT OPTION: a
27
In testing for starch in a leaf, the leaf is first boiled in water for about a minute so that the
A
cell walls are hardened
B
cells are killed
C
chlorophyll is dissolved out
D
iodine will penetrate
CORRECT OPTION: b
28
Which of the following food substances is incorrectly linked to its enzyme?
A
Protein - trypsin
B
Fat - lipase
C
Sucrose - pepsin
D
Starch - amylase
CORRECT OPTION: c
29
Which of the following pH values is the best for the action of the enzymes - renin and pepsin in the
stomach?
A
pH2
B
pH7
C
pH8
D
pH9
CORRECT OPTION: a
30
The bacterium in a mutualistic association with legumes converts
A
nitrates to ammonia
B
ammonium compounds to nitrites
C
nitrogen gas to ammonia
D
nitrites to nitrates
CORRECT OPTION: d
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