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Ecosystem — NEET UG Botany PYQs

737 previous year questions from Ecosystem with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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1

Match List I with List II : List I List II A. Productivity I. Gross primary productivity minus respiration losses B. Net primary productivity II. Rate of formation of new organic m

NEET 2026 Solution View → 2

Ecological pyramids represent the relationship between the organisms at different trophic levels and they are generally inverted for :

NEET 2026 Solution View → 3

Which of the following statements are correct ? (a) Energy flow from producers to consumers is unidirectional (b) Energy pyramid can never be inverted (c) Transfer of energy follow

NEET 2026 Solution View → 4

Which of the following are primary consumers in a food chain ?

NEET 2026 Solution View → 5

Match List I with List II : List I List II A. Decomposition I. Accumulation of dark coloured amorphous colloidal substance B. Detritus II. Release of inorganic nutrients by the act

NEET 2026 Solution View → 6

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

NEET 2025 Solution View → 7

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 photosynt

NEET 2025 Solution View → 8

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

NEET 2025 Solution View → 9

Consider the pyramid of energy of an ecosystem given below: If T₄ is equivalent to 1000 J , what is the value at T₁ ?

NEET 2024 Solution View → 10

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100 x ( kcal m ⁻² ) yr ⁻¹ , what would be the GPP (Gross Primary Productivity) of the third trophic

NEET 2024 Solution View → 11

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

NEET 2024 Solution View → 12

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 Solution View → 13

In the equation GPP - R = NPP GPP is Gross Primary Productivity NPP is Net Primary Productivity R here is :

NEET 2023 Solution View → 14

Identify the correct statement: A. Detrivores perform fragmentation. B. The humus is further degraded by some microbes during mineralisation. C. Water soluble inorganic nutrients g

NEET 2023 Solution View → 15

Match List-I with List-II. Choose the correct answer from the options given below :

NEET 2023 Solution View → 16

Match the List-I with List-II : Choose the correct answer from the options given below :

NEET 2022 Solution View → 17

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

NEET 2022 Solution View → 18

Which one of the following will accelerate phosphorus cycle?

NEET 2022 Solution View → 19

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

NEET 2022 Solution View → 20

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

NEET 2022 Solution View → 21

The pioneer species in a hydrarch succession are:

NEET 2022 Solution View → 22

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 fast

NEET 2022 Solution View → 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 Solution View → 24

In the equation, GPP - R = NPP , R represents:

NEET 2021 Solution View → 25

Which of the following statements is not correct?

NEET 2021 Solution View → 26

Which of the following statements is incorrect?

NEET 2020 Solution View → 27

Which of the following statements is incorrect regarding the phosphorus cycle?

NEET 2020 Solution View → 28

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

NEET 2020 Solution View → 29

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

NEET 2020 Solution View → 30

The rate of decomposition is faster in the ecosystem due to following factors EXCEPT :

NEET 2020 Solution View → 31

Which of the following ecological pyramids is generally inverted?

NEET 2019 Solution View → 32

Assertion : Net primary productivity is gross primary productivity minus respiration. Reason : Secondary productivity is produced by heterotrophs.

AIIMS 2018 Solution View → 33

What type of ecological pyramid would be obtained with following data? Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g

NEET 2018 Solution View → 34

Which of the following ecosystem has the maximum amount of biomass production?

NEET 2017 Solution View → 35

Presence of plants arranged into well-defined vertical layers depending on their height can be seen best in:

NEET 2017 Solution View → 36

Most animals that live in deep oceanic waters are

AIIMS 2016 Solution View → 37

The term ecosystem was coined by:

NEET 2016 Solution View → 38

Which of the following is correctly matched?

NEET 2016 Solution View → 39

Which one of the following is a characteristic feature of cropland ecosystem?

NEET 2016 Solution View → 40

Select the pairs of sedimentary biogeochemical cycles. I. Hydrogen cycle and water cycle II. Phosphorus Cycle and sulphur cycle III. Calcium cycle and magnesium cycle IV. Carbon cy

NEET 2016 Solution View → 41

During ecological succession:

NEET 2015 Solution View → 42

Most animals that live in deep oceanic waters are:

NEET 2015 Solution View → 43

In which of the following both pairs have correct combination?

NEET 2015 Solution View → 44

Vertical distribution of different species occupying different levels in a biotic community is known as:

NEET 2015 Solution View → 45

Secondary succession takes place on/in:

NEET 2015 Solution View → 46

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

NEET 2015 Solution View → 47

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

NEET 2015 Solution View → 48

An association of individuals of different species living in the same habitat and having functional interactions is:

NEET 2015 Solution View → 49

Benthic organisms are found in

JIPMER 2014 Solution View → 50

Overlapping region between two ecosystems is called

JIPMER 2014 Solution View → 51

Stability of ecosystem depends upon

JIPMER 2014 Solution View → 52

Which of the following supports a dense population of plankton and littoral vegetation?

JIPMER 2014 Solution View → 53

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.

NEET 2014 Solution View → 54

If 20J 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

NEET 2014 Solution View → 55

Assertion : Rice field is an ecosystem for plants and animals. Reason : Gut of human/animals is an ecosystem for flora and fauna.

AIIMS 2013 Solution View → 56

The ultimate source of energy for living being is

JIPMER 2013 Solution View → 57

The direction of energy flow is

JIPMER 2013 Solution View → 58

The age pyramid with broad base indicates:

NEET 2013 Solution View → 59

Benthic organisms are affected the most by:

NEET 2013 Solution View → 60

When man eats fish which feeds on zooplanktons which have eaten small plants, the producer in this chain is:

NEET 2013 Solution View → 61

Secondary productivity is rate of formation of new organic matter by

NEET 2013 Solution View → 62

Natural reservoir of phosphorus is

NEET 2013 Solution View → 63

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

NEET 2013 Solution View → 64

Which of the following is a primary consumer in maize field ecosytem?

NEET 2013 Solution View → 65

Assertion : In a terrestrial ecosystem, detritus food chain is the major conduit for energy flow. Reason : Solar energy is the direct source for energy supply in a detritus food ch

AIIMS 2012 Solution View → 66

Identify the possible link A in the following food chain Green plant Insect Frog A Eagle

NEET 2012 Solution View → 67

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?

NEET 2012 Solution View → 68

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

NEET 2012 Solution View → 69

The upright pyramid of number is absent in

NEET 2012 Solution View → 70

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

NEET 2012 Solution View → 71

Identify the likely organisms (I, II) (III) and (IV) in the food web shown below

NEET 2012 Solution View → 72

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

NEET 2012 Solution View → 73

The second stage of hydrosere is occupied by plants like

NEET 2012 Solution View → 74

Ten percent law of energy transfer in a food chain is given by

JIPMER 2011 Solution View → 75

Intermediate community between pioneer and climax communities is called

JIPMER 2011 Solution View → 76

Which one of the following statements is correct for secondary succession?

NEET 2011 Solution View → 77

Of the total incident solar radiation the proportion of PAR is

NEET 2011 Solution View → 78

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

NEET 2011 Solution View → 79

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

NEET 2011 Solution View → 80

Both, hydrarch and xerarch successions lead to

NEET 2011 Solution View → 81

Eutrophication is often seen in

NEET 2011 Solution View → 82

What type of human population is represented by the following age pyramid?

NEET 2011 Solution View → 83

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

NEET 2011 Solution View → 84

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

NEET 2011 Solution View → 85

Animals take phosphorus from

AIIMS 2010 Solution View → 86

What is the Greek word for ecology?

AIIMS 2010 Solution View → 87

From which of the following plant is a medicine for respiratory disorders obtained?

JIPMER 2010 Solution View → 88

A renewable exhaustible natural resource is

NEET 2010 Solution View → 89

Which of the following representations shows the pyramid of numbers in a forest ecosystem?

NEET 2010 Solution View → 90

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

NEET 2010 Solution View → 91

Assertion : Secondary succession takes place in recently denuded area. Reason : It is caused due to baring of an area.

AIIMS 2009 Solution View → 92

Lichen is the pioneer vegetation on which succession?

JIPMER 2009 Solution View → 93

The presence of diversity at the junction of territories of two different habitats is known as

JIPMER 2009 Solution View → 94

The correct sequence of plants in a hydrosere is

NEET 2009 Solution View → 95

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem ?

NEET 2009 Solution View → 96

Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of :

NEET 2009 Solution View → 97

Which one of the following types organisms occupy more than one trophic level in a pond ecosystem ?

NEET 2009 Solution View → 98

The correct sequence of plants in hydrosere is :

NEET 2009 Solution View → 99

Reduction in vascular tíssue, mechanical tissue and cuticle is characteristic of

NEET 2009 Solution View → 100

The bacteria which attack dead animals are

AIIMS 2008 Solution View → 101

Assertion : The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity. Reason : Gross primary productivity is t

AIIMS 2008 Solution View → 102

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this (1) Lots of urea and phosphate fertilizer were used in the crops

NEET 2008 Solution View → 103

About 70 % of total global carbon is found in

NEET 2008 Solution View → 104

Consider the following statements concerning food chains A. removal of 80 % tigers from an area resulted in greatly increased growth of vegetation B. removal of most of the carnivo

NEET 2008 Solution View → 105

Quercus species are the dominant component in

NEET 2008 Solution View → 106

The slow rate of decomposition of fallen logs in nature is due to their

NEET 2008 Solution View → 107

Consider the following statements concerning food chains (a) Removal of 80 % tigers from an area resulted in greatly increased growth of vegetation (b) Removal of most of the carni

NEET 2008 Solution View → 108

Beta diversity is diversity

AIIMS 2007 Solution View → 109

Assertion : Plants absorb sulphur in the form of sulphate ions. Reason : Sulphur bacteria are required for the formation of sulphate.

AIIMS 2007 Solution View → 110

Ozone in stratosphere extends

AIIMS 2007 Solution View → 111

Which one of the following pairs is mismatched?

JIPMER 2007 Solution View → 112

Assertion : UV radiation causes photodissociation of ozone into O ₂ and O , thus causing damage to the stratospheric ozone layer. Reason : Ozone hole is resulting in global warming

AIIMS 2006 Solution View → 113

Assertion : In tropical rain forests, O-horizon and A-horizon of soil profile are shallow and nutrient-poor. Reason : Excessive growth of micro-organisms in the soil depletes its o

AIIMS 2006 Solution View → 114

Assertion : Deforestation is one main factor contributing to global warming. Reason : Besides CO ₂ , two other gases methane and CFCs are also included under green house gases.

AIIMS 2006 Solution View → 115

Green plants constitute :

JIPMER 2006 Solution View → 116

Which one of the following is not used for construction of ecological pyramids?

NEET 2006 Solution View → 117

Given below is one of the types of ecological pyramids. This type represents

AIIMS 2005 Solution View → 118

Which one of the following correctly represents an organism and its ecological niche?

AIIMS 2005 Solution View → 119

Which one of the following is correct matching of a plant, its habit and the forest type where it normally occurs?

AIIMS 2005 Solution View → 120

If decomposers are removed what will happen to the ecosystem?

JIPMER 2005 Solution View →
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