2009 - WAEC Biology Past Questions and Answers - page 4
31
Which of the following statements about ecosystems is false?
A
All the energy entering the ecosystem is passed on to decomposers
B
The primary producers provide energy for herbivores and carnivores
C
Ecosystems must start with the capture of energy by autotrophs
D
Energy transfer from one trophic level to the other is not 100% efficient.
correct option: a
Users' Answers & Comments32
What is the critical limiting factor for plants below the photic zone is an aquatic ecosystem?
A
Availability of nutrients
B
Availability of water
C
Intensity of light
D
Carbon dioxide concentration
correct option: c
Users' Answers & Comments33
Which of the following instruments is used to estimate the number of plants in a habitat?
A
Pooter
B
Pitfall trap
C
Quadrat
D
Sweep net
correct option: c
Users' Answers & Comments34
Which of the following statements is true about sandy soil? It
A
has limited air space
B
is light and easy to dig
C
drains slowly
D
is heavy and poorly aerated
correct option: b
Users' Answers & Comments35
Which of the following organisms is a primary consumer?
A
Dog
B
Sheep
C
Grass
D
Fungus
correct option: b
Users' Answers & Comments36
P → Q → R → S → T
he organism designated P in the food chain above is normally sustained by energy from
A
sunlight
B
carbohydrates
C
green plants
D
mineral salts.
correct option: a
Users' Answers & Comments37
P → Q → R → S → T
Which of the following statements best describes the organism designated R? It
A
feeds on S
B
is a primary consumer
C
is a producer as well as a consumer
D
is a secondary consumer
correct option: d
Users' Answers & Comments38
Food chains are relatively short because
A
of energy recycling in the ecosystem
B
energy gain at each trophic level is high.
C
of energy loss at each trophic level
D
energy flow in an ecosystem is uni-directional.
correct option: c
Users' Answers & Comments39
which of the following organisms does not show colour adaptation to its environment?
A
Chameleon
B
Earthworm
C
Fish
D
Toad
correct option: b
Users' Answers & Comments40
Most tropical plants shed their leaves during dry weather conditions in order to
A
reduce their growth rate.
B
conserve water
C
reduce competition
D
minimize the rate of photosynthesis
correct option: b
Users' Answers & Comments