MCQ (Single Correct Answer)

1

Given below are two statements:

Statement I: The primary source of energy in an ecosystem is solar energy.

Statement II : The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).

In the light of the above statements, choose the most appropriate answer from the options given below:

NEET 2025
2

Who is known as the father of Ecology in India?

NEET 2025
3

Given below are two statements:

Statement I: In ecosystem, there is unidirectional flow of energy of sun from producers to consumers.

Statement II: Ecosystems are exempted from 2nd law of thermodynamics.

In the light of the above statements, choose the most appropriate answer from the options given below:

NEET 2025
4

Which of the following is the unit of productivity of an Ecosystem?

NEET 2025
5

Consider the pyramid of energy of an ecosystem given below:

NEET 2024 (Re-Examination) Biology - Ecosystem Question 5 English

If T$$_4$$ is equivalent to $$1000 \mathrm{~J}$$, what is the value at $$\mathrm{T}_1$$ ?

NEET 2024 (Re-Examination)
6

Which one of the following is not a limitation of ecological pyramids?

NEET 2024 (Re-Examination)
7

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is $$100 x\left(\mathrm{kcal} \mathrm{~m}^{-2}\right) \mathrm{yr}^{-1}$$, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

NEET 2024
8

Match List - I with List - II

List - I List - II
(A) Hydrarch succession (I) Gradual change in the species composition
(B) Xerarch succession (II) Faster and climax reached quickly
(C) Ecological succession (III) Lichens to mesic conditions
(D) Secondary succession (IV) Phytoplankton to mesic conditions

Choose the correct answer from the options given below :

NEET 2023 Manipur
9

The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as :

NEET 2023 Manipur
10

The species of plants that plays a vital role in controlling the relative abundance of other species in a community is called _________.

NEET 2023 Manipur
11

Identify the correct statements :

A. Detrivores perform fragmentation.

B. The humus is further degraded by some microbes during mineralization.

C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.

D. The detritus food chain begins with living organisms.

E. Earthworms break down detritus into smaller particles by a process called catabolism.

Choose the correct answer from the options given below :

NEET 2023
12

In the equation GPP $$-$$ R = NPP

GPP is Gross Primary Productivity

NPP is Net Primary Productivity

R here is __________.

NEET 2023
13

Which one of the following statements is NOT correct?

NEET 2023
14

Match List I with List II:

List I
(Interaction)
List II
(Species A and B)
(A) Mutualism (I) +(A), 0(B)
(B) Commensalism (II) $$-$$(A), 0(B)
(C) Amensalism (III) +(A), $$-$$(B)
(D) Parasitism (IV) +(A), +(B)

Choose the correct answer from the options given below:

NEET 2023
15

All successions irrespective of the habitat proceed to which type of climax community?

NEET 2022 Phase 2
16

The pioneer species in a hydrarch succession are

NEET 2022 Phase 2
17

The species that come to appear in bare area are called

NEET 2022 Phase 2
18

The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called

NEET 2022 Phase 2
19

Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together, they may avoid competition in the same garden by :

NEET 2022 Phase 2
20

Given below are two statements:

Statement I : Decomposition is a process in which the detritus is degraded into simpler substances by microbes.

Statement II : Decomposition is faster if the detritus is rich in lignin and chitin.

In the light of the above statements, choose the correct answer from the options given below :

NEET 2022 Phase 1
21

Which one of the following will accelerate phosphorus cycle?

NEET 2022 Phase 1
22

Detritivores breakdown detritus into smaller particles. This process is called :

NEET 2022 Phase 1
23
The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as :
NEET 2021
24
Which of the following statements is not correct?
NEET 2021
25
In the equation GPP - R = NPP

R represents :
NEET 2021
26
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
NEET 2020 Phase 1
27
Match the trophic levels with their correct species examples in grassland ecosystem.

(A) Fourth trophic level   (i) Crow
(B) Second trophic level  (ii) Vulture
(C) First trophic level      (iii) Rabbit
(D) Third trophic level    (iv) Grass

Select the correct option
NEET 2020 Phase 1
28
Which of the following ecological pyramids is generally inverted?
NEET 2019
29
Which of the following is the most important cause for animals and plants being driven to extinction?
NEET 2019
30
What type of ecological pyramid would be obtained with the following data?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
NEET 2018
31
Which ecosystem has the maximum biomass ?
NEET 2017
32
The primary producers of the deep-sea hydrothermal vent ecosystem are
NEET 2016 Phase 2
33
The term ecosystem was coined by :
NEET 2016 Phase 1
34
Which of the following would appear as the pioneer organisms on bare rocks?
NEET 2016 Phase 1
35
Which one of the following is a characteristic feature of cropland ecosystem ?
NEET 2016 Phase 1
36
In which of the following both pairs have correct combination?
AIPMT 2015
37
During ecological succession :
AIPMT 2015
38
Most animals that live in deep oceanic waters are -
AIPMT 2015
39
In an ecosystem the rate of production of organic matter during photosynthesis is termed as :
AIPMT 2015 Cancelled Paper
40
Most animals are tree dwellers in a:
AIPMT 2015 Cancelled Paper
41
The mass of living material at a trophic level at a particular time is called :
AIPMT 2015 Cancelled Paper
42
Secondary Succession takes place on/in :
AIPMT 2015 Cancelled Paper
43
Vertical distribution of different species occupying different levels in a biotic community is known as :
AIPMT 2015 Cancelled Paper
44
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
AIPMT 2014
45
Match the following and select the correct option:
(a) Earthworm (i) Pioneer species
(b) Succession (ii) Detritivore
(c) Ecosystem service (iii) Natality
(d) Population growth (iv) Pollination
AIPMT 2014
46
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks. AIPMT 2014 Biology - Ecosystem Question 67 English
AIPMT 2014
47
When man eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is :
NEET 2013 (Karnataka)
48
Which one of the following is a primary consumer in maize field ecosystem ?
NEET 2013 (Karnataka)
49
Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere ?
NEET 2013 (Karnataka)
50
Secondary productivity is rate of formation of new organic matter by :
NEET 2013
51
Which one of the following processes during decomposition is correctly described ?
NEET 2013
52
Natural reservoir of phosphorus is :
NEET 2013
53
Identify the likely organisms (a), (b), (c) and (d) in the food web shown below : AIPMT 2012 Mains Biology - Ecosystem Question 52 English
AIPMT 2012 Mains
54
The rate of formation of new organic matter by rabbit in a grassland, is called :
AIPMT 2012 Mains
55
The second stage of hydrosere is occupied by plants like
AIPMT 2012 Mains
56
Which one of the following is not a functional unit of an ecosystem?
AIPMT 2012 Prelims
57
Which one of the following is not a gaseous biogeochemical cycle in ecosystem ?
AIPMT 2012 Prelims
58
Identify the possible link "A" in the following food chain :
Plant → insect → frog →"A"→ Eagle
AIPMT 2012 Prelims
59
The upright pyramid of number is absent in
AIPMT 2012 Prelims
60
Giiven below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels ? AIPMT 2012 Prelims Biology - Ecosystem Question 57 English
AIPMT 2012 Prelims
61
Both, hydrarch and xerarch successions lead to :
AIPMT 2011 Mains
62
Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time ?
AIPMT 2011 Mains
63
The breakdown of detritus into smaller particles by earthworm is a process called
AIPMT 2011 Mains
64
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
AIPMT 2011 Prelims
65
Which one of the following statements is correct for secondary succession?
AIPMT 2011 Prelims
66
Of the total incident solar radiation the proportion of PAR is
AIPMT 2011 Prelims
67
Mass of living matter at a trophic level in an area at any time is called :
AIPMT 2011 Prelims
68
Which of the following representations shows the pyramid of numbers in a forest ecosystem ? AIPMT 2010 Mains Biology - Ecosystem Question 43 English
AIPMT 2010 Mains
69
The biomass available for consumption by the herbivores and the decomposers is called –
AIPMT 2010 Prelims
70
Which one of the following types organisms occupy more than one trophic level in a pond ecosystem ?
AIPMT 2009
71
The correct sequence of plants in hydrosere is :
AIPMT 2009
72
The slow rate of decomposition of fallen logs in nature is due to their:
AIPMT 2008
73
About 70% of total global carbon is found in:
AIPMT 2008
74
Consider the following statements concerning food chains:
(i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(ii) Removal of most of the carnivores resulted in an increased population of deers
(iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss
(iv) The length of food chains may vary from 2 to 8 trophic levels
Which of two of the above statements are correct ?
AIPMT 2008
75
Which one of the following ecosystem types has the highest annual net primary productivity ?
AIPMT 2007
76
Which one of the following is not used for construction of ecological pyramids ?
AIPMT 2006
77
An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having -
AIPMT 2004
78
Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem ?
AIPMT 2004
79
Which of the following plants are used as green manure in crop fields and in sandy soils ?
AIPMT 2003
80
Bamboo plant is growing in a far forest then what will be the trophic level of it ?
AIPMT 2002
81
Plant Decomposers are : -
AIPMT 2001
82
Which is the reason for highest biomass in aquatic ecosystem ?
AIPMT 2000
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