NEET 2021 Ecosystem Objective Questions,answers,solutions,pdfs,mcqs

Ecosystem Mock Exam-9

Question No:1

Assertion: Of the incident solar radiation less than 0 % of its PAR.
Reason: Plant capture – 0 % of the PAR.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false [D] If both the assertion and reason are false



Question No:2

Assertion: Biomass of a species is expressed in terms of dry weight in more accurate than fresh weight.
Reason: Fresh weight is affected by environment condition.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false [D] If both the assertion and reason are false



Question No:3

Assertion: Pyramid of energy is always upright.
Reason: Energy flow is unidirectional & some energy is always lost as heat at each step.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false [D] If both the assertion and reason are false



Question No:4

Assertion: Gradual and fairly predictable change in the species composition of a given area is called succession.
Reason: Succession & evolution are same.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false [D] If both the assertion and reason are false



Question No:5

Assertion: Secondary succession is faster than primary succession.
Reason: Some soil or sediments are presents.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false [D] If both the assertion and reason are false



Question No:6

Assertion: Phosphorus cycle is sedimentary cycle.
Reason: Reservoir of phosphorus located in earth’s crust.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false [D] If both the assertion and reason are false



Question No:7

The biomass available for consumption by the herbivores and the decomposers is called:

[A] Net primary productivity
[B] Secondary productivity
[C] Standing crop [D] Gross primary productivity



Question No:8

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

[A] Sparrow
[B] Lion
[C] Goat [D] Frog



Question No:9

Both hydrarch and xerarch successions lead to

[A] Medium water conditions
[B] Xeric conditions
[C] Highly dry conditions [D] Excessive wet conditions



Question No:10

The breakdown of detritus into smaller particles by earthworm is a process called

[A] Humification
[B] Fragmentation
[C] Mineralisation [D] Catabolism



Question No:11

Which of the following statements is correct for secondary succession?

[A] It occurs on a deforested site
[B] It follows primary succession
[C] It is similar to primary succession except that it has a relatively fast pace [D] It begins on a bare rock



Question No:12

Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?

[A] It shows energy content of different trophic level organisms
[B] It is inverted in shape
[C] It is upright in shape [D] Its base is broad



Question No:13

Mass of living matter at a trophic level in an area at any time is called:

[A] Detritus
[B] Humus
[C] Standing state [D] Standing crop



Question No:14

Of the total incident solar radiation the proportion of PAR is:

[A] About 60%
[B] Less than 50%
[C] More than 80% [D] About 70%



Question No:15

The rate of formation of new organic matter by rabbit in a grassland, is called:

[A] Secondary productivity
[B] Net primary productivity
[C] Gross primary productivity [D] Net productivity