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21.
The sign + is used to indicate an association where an organism gains, while 0 is used where an organism is unaffected. An association indicated as +0 is known as ----
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A.
predation
B.
commensalism
C.
parasitism
D.
competition
E.
ammensalism

22.
The sum total of all the roles an organism plays in a habitat is referred to as
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A.
ecology.
B.
ecosystem.
C.
habit.
D.
habitat.
E.
niche

23.
Which of the following factors does not control population growth?
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A.
Food shortage
B.
Emigration
C.
Predation
D.
Abundance of food
E.
Natural disaster

24.
Which of the following statements best describe an ecosystem?
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A.
A place where living organisms can live successfully.
B.
The interactions between living organism in a habitat and the non-living part of the environment.
C.
A biological association between a plant and an animal.
D.
A system of grouping organisms in a habitat.
E.
None of the above.

25.
Which of these represents a correct food chain in nature?
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A.
Crustacea → diatom →fish → man
B.
Diatom → crustacea → fish → man
C.
Fish → crustacea → man → diatom
D.
Diatom → fish → crustacea → man
E.
None of the above.

26.
___________ is involved in the mechanism of expelling water from the protozoans during the process of____________
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A.
Contractile vacuole, Osmoregulation
B.
Contractile vacuole, Phagocytosis
C.
Food vacuole, Ultrafilteration
D.
Food vacuole, Pinocytosis
E.
Cell membrane, [email protected]

27.
______________ is used for photosynthesis in Euglena sp.
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A.
Reservoir
B.
Nucleus
C.
Chloroplast
D.
Paramylon granule
E.
Pellicle

28.
A heart with four chambers is found in______________
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A.
Fishes
B.
Insects
C.
Snails
D.
Rats
E.
Worms

29.
Animal cell does not have a ____________
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A.
Membrane
B.
Nucleolus
C.
Food Vacuole
D.
Cell wall
E.
Golgi body

30.
Beriberi is caused by deficiency of vitamin_____________
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A.
A
B.
D
C.
K
D.
E
E.
B

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