2005 - WAEC Biology Past Questions and Answers - page 4
31
Which of the following substances has the highest amount of energy in joules per unit weight?
A
Carbohydrates
B
Proteins
C
Fats
D
Vitamins
correct option: c
Fats and ethanol have the greatest amount of food energy per mass, 37 and 29 kJ/g (8.8 and 6.9 kcal/g), respectively. Proteins and most carbohydrates have about 17 kJ/g (4 kcal/g)
Users' Answers & Comments32
Which of the following elements is required in large amounts by plants
A
Molybdenum
B
Boron
C
Copper
D
Phosphorus
correct option: d
Users' Answers & Comments33
Which of the following juices contains the enzyme ptyalin?
A
Gastric juice
B
Pancreatic juice
C
Succus
D
Saliva
correct option: d
Users' Answers & Comments34
Trees in savannah habitats usually have heavy thick bark which mainly
A
reduces the rate of transpiration
B
protect them from the scorching sun
C
protect them from heavy winds
D
resist bush tires
correct option: a
Users' Answers & Comments35
In the marine food web, the source of energy to the producer comes from
A
sea waves
B
sea water
C
sun
D
air
correct option: c
Users' Answers & Comments36
A population is best described as
A
a group of the same species of organisms living together
B
a group of animals and plants living together
C
a group of insects and grasses
D
different species of wild animals
correct option: a
Users' Answers & Comments37
Possession of strong adhesives is a feature of animals living in/on
A
sandy beaches
B
rocky shores
C
benthic zones
D
deserts
correct option: b
Users' Answers & Comments38
A stable self-sustaining environment produced by an interaction between the biotic and abiotic components is best described as
A
a niche
B
a community
C
an ecosystem
D
a habitat
correct option: c
Users' Answers & Comments39
Which of the following factors is not associated with aquatic habitats?
A
Salinity
B
Turbidity
C
Temperature
D
Edaphic
correct option: d
Users' Answers & Comments40
Which of the following instruments is used to measure the speed of a stream?
A
Simple float
B
Secchi disc
C
Quadrat frame
D
Rain gauge
correct option: a
Users' Answers & Comments