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

Ecosystem Mock Exam-10

Question No:1

The second stage of hydrosere is occupied by plants like

[A] Typha
[B] Salix
[C] Vallisneria [D] Azoll



Question No:2

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

[A] Sulphur cycle
[B] Phosphorus cycle
[C] Nitrogen cycle [D] Carbon cycle



Question No:3

Identify the possible link “A” in the following feed chain:
Plant —> insert —> Frog -> ” A”-» Eagle

[A] Rabbit
[B] Wolf
[C] Cobra [D] Parrot



Question No:4

Which one of the following is not a functional unit of an ecosystem?

[A] Energy flow
[B] Decomposition
[C] Productivity [D] Stratification



Question No:5

The upright pyramid of number is absent in:

[A] Pond
[B] Forest
[C] Lake [D] Grassland



Question No:6

Natural reservoir of phosphorus is:

[A] Sea water
[B] Animal bones
[C] Rock [D] Fossils



Question No:7

Secondary productivity is rate of formation of none organic matter by:

[A] Producer
[B] Parasite
[C] Consume [D] Decomposer



Question No:8

Which one of the following processes during decomposition is correctly described?

[A] Fragmentation – Carried out by organisms such as earthworm
[B] Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
[C] Catabolism – Last step in the decomposition under fully anaerobic condition [D] Leaching – Water soluble inorganic nutrients rise to the top layers of soil



Question No:9

Match the following and select the correct option:
Column –I— Column – II
(A) Earthworm (1) Pioneer species
(B) Succession (2) Detritivore
(C) Ecosystem service (3) Natality
(D) Population growth (4) Pollination

[A] A:1, B:2, C:3, D:4
[B] A:4, B:1, C:3, D:2
[C] A:3,B:2, C:4, D:1 [D] A:2, B:1, C:4, D:3



Question No:10

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?
Plant —>mice -> snake —> peacock

[A] 0.02 J
[B] 0.002 J
[C] 0.2 J [D] 0.0002 J



Question No:11

Secondary Succession takes place on/in

[A] Bare rock
[B] Degraded forest
[C] Newly created pond [D] Newly cooled lava



Question No:12

The mass of living material at a trophic level at a particular time is called

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



Question No:13

In an ecosystem the rate of production of organic matter during photosynthesis is termed as:

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



Question No:14

During ecological succession:

[A] The establishment of a new biotic community is very fast in its primary phase
[B] The numbers and types of animals remain constant
[C] The changes lead to a community that is in near equilibrium with the environment and is called pioneer community [D] The gradual the predictable change in species composition occurs in a given area



Question No:15

Most animals that live in deep oceanic waters are:

[A] Secondary consumers
[B] Tertiary consumers
[C] Detritivore [D] Primary consumers