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
correct option: c
Users' Answers & Comments32
Which of the following enzymes is active in the duodenum?
A
Pepsin
B
Renin
C
Trypsin
D
Amylase
correct option: c
Users' Answers & Comments33
The following organisms are producers except
A
Hibiscus
B
Mushroom
C
Cactus
D
Spirogyra
correct option: b
Users' Answers & Comments34
Which of the following structures produces the greatest variety of digestive enzymes?
A
Salivary glands
B
Pancreas
C
Stomach
D
Colon
correct option: b
Users' Answers & Comments35
The following are abiotic components of an ecosystem except
A
temperature
B
oxygen
C
bacteria
D
soil
correct option: c
Users' Answers & Comments36
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
correct option: c
The formula for estimated population is
\(\frac{No of marked in 1st capture}{No of species} = \frac{No of marked in 2nd capture}{no of species in 2nd capture}\)
= \(\frac{200 \times 120}{40} = 600\)
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
correct option: c
Users' Answers & Comments38
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
correct option: c
Users' Answers & Comments39
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
correct option: c
Users' Answers & Comments40
A xerophyte conserves water by possession of the following features except
A
thick cuticle
B
sunken stomata
C
broad leaves
D
fleshy stem
correct option: c
Users' Answers & Comments