2011 - WAEC Biology Past Questions and Answers - page 4
31
A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution were added to a food substance. The food substance is likely to be a
A
carbohydrate
B
fat
C
protein
D
sugar
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32
Which of the following enzymes is active in the duodenum?
A
Pepsin
B
Renin
C
Trypsin
D
Amylase
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33
The following organisms are producers except
A
Hibiscus
B
Mushroom
C
Cactus
D
Spirogyra
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34
Which of the following structures produces the greatest variety of digestive enzymes?
A
Salivary glands
B
Pancreas
C
Stomach
D
Colon
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35
The following are abiotic components of an ecosystem except
A
temperature
B
oxygen
C
bacteria
D
soil
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36
Use the information on capture-recapture method to calculate the total number of organisms in a habitat.
First capture = 200
Second capture = 120
Number of organisms with mark in second capture = 40
The total number of organisms therefore is
A
200
B
360
C
600
D
800
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37
Ecological investigation in a habitat includes the following procedures except
A
choosing a habitat
B
identification of specimens
C
determining the genetic makeup of specimens
D
measuring abiotic and biotic factors
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38
Which of the following substances when lost from the body of a mammal will not be returned to the ecosystem?
A
Sweat
B
Urea
C
Heat energy
D
Carbon dioxide
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39
The rate of decomposition of organisms is faster in the tropical rain forest than in other biomes because
A
of the relatively constant daylight
B
there are more plants per square feet
C
of abundance of water
D
of constant cool temperature
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40
A xerophyte conserves water by possession of the following features except
A
thick cuticle
B
sunken stomata
C
broad leaves
D
fleshy stem
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