Prelims Revision Series | Science and Tech| Ecology (Part -1) | 29

May 24, 2023

Ecotone is:

(A) A polluted area
(B) The bottom of a lake
(C) A zone of transition between two communities
(D) A zone of developing community

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Answer: C

Ecological niche is:

(A) The surface area of the ocean
(B) An ecologically adapted zone
(C) The physical position and functional role of a species within the community
(D) Formed of all plants and animals living at the bottom of a lake

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Answer: C

According to Allen’s Rule, the mammals from colder climates have:

(A) Shorter ears and longer limbs
(B) Longer ears and shorter limbs
(C) Longer ears and longer limbs
(D) Shorter ears and shorter limbs

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Answer: D

Population in a given habitat?

(A) Natality > mortality
(B) Immigration > emigration
(C) Mortality and emigration
(D) Natality and immigration

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Answer: C

What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park?

(A) It will grow normally
(B) It will grow well because it is planted in the same locality
(C) It may not survive because of change in its micro climate
(D) It grows very well because the plant gets more sunlight

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Answer: C

Amensalism is an association between two species where:

(A) One species is harmed and other is benefitted
(B) One species is harmed and other is unaffected
(C) One species is benefitted and other is unaffected
(D) Both the species are harmed.

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Answer: B

Lichens are association of:

(A) Bacteria and fungus
(B) Alga and bacterium
(C) Fungus and alga
(D) Fungus and virus

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Answer: C

Which one of the following organisms reproduces sexually only once in its life time?

(A) Banana
(B) Mango
(C) Tomato
(D) Eucalyptus

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Answer: A

Decomposers like fungi and bacteria are:
i. autotrophs
ii. heterotrophs
iii. saprotrophs
iv. chemo-autotrophs.
Choose the correct answer:

(A) i and iii,
(B) i and iv
(C) ii and iii
(D) i and ii

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Answer: C

An inverted pyramid of biomass can be found in which ecosystem?

(A) Forest
(B) Marine
(C) Grass land
(D) Tundra

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Answer: B

Pyramid of numbers is:

(A) Always upright
(B) Always inverted
(C) Either upright or inverted
(D) Neither upright nor inverted.

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Answer: C

Among the following bio-geo-chemical cycles which one does not have losses due to respiration?

(A) Phosphorus
(B) Nitrogen
(C) Sulphur
(D) All of the above

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Answer: D

Edaphic factor refers to:

(A) Water
(B) Soil
(C) Relative humidity
(D) Altitude

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Answer: B

The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:

(A) Pelagic zone
(B) Benthic zone
(C) Lentic one
(D) Littoral zone

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Answer: D

Climax community is in a state of:

(A) Non-equilibrium
(B) Equilibrium
(C) Disorder
(D) Constant change.

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Answer: B