Biology 2010 | Study Mode

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Question 21

A food chain always begins with a

consumer

decomposer

producer

primary consumer

Explanation

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Correct option: C

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Question 22

Mycorrhizae promote plant growth by

absorbing inorganic ions from the soil

protecting it from infection

helping it to utilize atmospheric nitrogen

serving as a growth regulator

Explanation

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Correct option: D

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Question 23

The barrier between maternal and foetal blood is the

placenta

liver

umbilical chord

uterine wall

Explanation

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Correct option: A

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Question 24

The blood component that has the greatest affinity for oxygen is the

lymphocytes

leucocytes

erythrocytes

thrombocytes

Explanation

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Correct option: C

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Question 25

Which of the following organisms is mainly found in the marine habitat?

Achatina

Tilapia

Dog fish

Tortoise

Explanation

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Correct option: C

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Question 26

The two halves of the pelvic girdle are joined together at the

public symphysis

ilium

pubis

obturator foramen

Explanation

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Correct option: A

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Question 27

I. Adoption of appropriate nocturnal habits ll. Burrowing lll. Adjusting their internal body temperature. IV Possession of many sweat pores.
Which of the above are ways in which desert animals adapt to extreme heat of the environment?

I and IV only

ll and lll only

l and ll only

l, ll and lll only

Explanation

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Correct option: B

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Question 28

Low annual rainfall, sparse vegetation , high diurnal temperatures and cold nights are characteristic features of the

tropical rainforest

desert

montane forest

guinea savanna

Explanation

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Correct option: B

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Question 29

The activity of an organism which affects the survival of another organism in the same habitat constitutes

an edaphic factor

an abiotic factor

a biotic factor

a physiographic factor

Explanation

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Correct option: C

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Question 30

The average number of individuals of a species per unit area of the habitat is the

population density

population frequency

population size

population distribution

Explanation

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Correct option: A

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