1993 - JAMB Biology Past Questions and Answers - page 4
31
What is the term used to describe the sum total of biotic and abiotic factors in the environment of the organism?
A
Habitat
B
Biome
C
Ecosystem
D
Ecological niche
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32
Important abiotic factors which affects all plants and animals in the habitat are
A
temperature and turbidity
B
rainfall and relative humididty
C
salinity and wind direction
D
temperature and rainfall
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33
The most important physical factor which affects an organism living in the intertidal zone of the seashore is
A
pH
B
salinity
C
wave action
D
temperature
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34
At which trophic level would the highest accumulation of a non-biodegradable substance occur?
A
Primary producers
B
Tertiary consumers
C
Primary consumers
D
Secondary consumers
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35
Two organisms of different species, living in close association but not dependent on each other are referred to as
A
parasites
B
commensals
C
symbionts
D
autotrophs
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36
Which of the following instruments is NOT used in measuring abiotic factors in any habitat?
A
Microscopic
B
Thermometer
C
Hygrometer
D
Wind vane
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37
Plants adapted for life in salty marsh are called
A
hydrophytes
B
xerophytes
C
halophytes
D
epiphytes
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38
Which group of plants would be the first colonizers in an ecological succession changing rocks to soil?
A
Mosses
B
Ferns
C
Lichens
D
Grasses
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39
Soil fertility can be conserved and renewed by
A
yearly monocropping
B
crop rotation and cover crops
C
bush burning to remove unwanted debris
D
avoiding artificial manures
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40
What ecological condition favours the breeding of black flies?
A
Fresh water habitat
B
Water in ponds and swamp
C
Water in small containers
D
Fast flowing streams
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