Populations & Ecosystems Test

Question 1/10
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Under unfavourable conditions many zooplankton species in lakes and ponds are known to enter ________, a stage of suspended development.

A
Conform

B
Diapause

C
Migrate

D
Dormant

Question 2/10
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Which of the following leaf modifications occur(s) in the desert areas to inhibit water loss?
1. Hard and waxy leaves
2. Tiny leaves
3. Thorns instead of leaves
Select the correct answer using the code given below:

A
2 and 3 only

B
2 only

C
1 and 3 only

D
1, 2 and 3

Question 3/10
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Asymptote in a logistic growth curve is obtained when

A
K > N

B
K < N

C
K = N

D
None of these

Question 4/10
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_______ is the interaction in which one species is benefitted and the other is neither harmed nor benefitted.

A
Commensalism

B
Mutualism

C
Parasitism

D
Predation

Question 5/10
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The age pyramid with a narrow base indicates

A
High number of young individuals

B
Low number of young individuals

C
High number of old individuals

D
Low number of old individuals

Question 6/10
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Match the following
(a) Herbivorous (i) Third tropical level
(b) Carnivorous (ii) Primary consumers
(c) Producers (iii) feeds on dead remains
(d) Decomposer (iv) Prepare food from solar energy

A
(a) - (ii), (b) - (i), (c) - (iii), (d) - (iv)

B
(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)

C
a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)

D
(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)

Question 7/10
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Consider the following statements regarding Decomposers.
1. By the process of leaching, water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts.
2. Humification leads to the accumulation of a dark-coloured amorphous substance called humus that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.
Which of the statements given above is/are correct?

A
1 only

B
2 only

C
Both 1 and 2

D
Neither 1 nor 2

Question 8/10
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A sedimentary biogeochemical cycle has its reservoir in the

A
Atmosphere

B
Earth's crust

C
Living beings

D
None of the above

Question 9/10
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Newly cooled lava, bare rock, newly created pond or reservoir are examples of areas where ________ occured?

A
Secondary succession

B
Primary succession

C
Tertiary succession

D
No succession

Question 10/10
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In which of the following ecosystems, inverted pyramid of biomass can be observed?

A
Marine

B
Tundra

C
Forest

D
Grass land

(a) Herbivorous	(i) Third tropical level
(b) Carnivorous	(ii) Primary consumers
(c) Producers	(iii) feeds on dead remains
(d) Decomposer	(iv) Prepare food from solar energy

Question 1/10

Conform

Diapause

Migrate

Dormant

Question 2/10

2 and 3 only

2 only

1 and 3 only

1, 2 and 3

Question 3/10

K > N

K < N

K = N

None of these

Question 4/10

Commensalism

Mutualism

Parasitism

Predation

Question 5/10

High number of young individuals

Low number of young individuals

High number of old individuals

Low number of old individuals

Question 6/10

(a) - (ii), (b) - (i), (c) - (iii), (d) - (iv)

(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)

a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)

(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)

Question 7/10

1 only

2 only

Both 1 and 2

Neither 1 nor 2

Question 8/10

Atmosphere

Earth's crust

Living beings

None of the above

Question 9/10

Secondary succession

Primary succession

Tertiary succession

No succession

Question 10/10

Marine

Tundra

Forest

Grass land