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31 Years NEET Previous Year Questions: Ecosystem - 1 - NEET MCQ


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20 Questions MCQ Test Biology Class 12 - 31 Years NEET Previous Year Questions: Ecosystem - 1

31 Years NEET Previous Year Questions: Ecosystem - 1 for NEET 2024 is part of Biology Class 12 preparation. The 31 Years NEET Previous Year Questions: Ecosystem - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Years NEET Previous Year Questions: Ecosystem - 1 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Years NEET Previous Year Questions: Ecosystem - 1 below.
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31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 1

The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc. present in the soil at any given time, is referred to as the      [2021]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 1

The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc., present in the soil at any given time, is referred to as the standing state.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 2

In relation to Gross primary productivity and Net primary productivity of an ecosystem. Which one of the following statements is correct?    [2020]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 2

The gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis. Some of this organic matter is lost because of the respiration of plants. The remaining primary productivity is the net primary productivity.

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31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 3

Which ot the following ecological pyramids is generally inverted?   [2019]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 3

Pyramid of biomass in an aquatic ecosystem (e.g., pond, sea) is usually inverted because the biomass of fishes exceeds the biomass of phytoplanktons.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 4

What type of ecological pyramid would be obtained with the following data?    [2018)]
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 4

The given data depicts the inverted pyramid of biomass, usually found in aquatic ecosystem. This can be understood by taking an example of a pond in which phytoplankton (10g) represents the producer. Small fishes (60g) feeding upon these phytoplankton represent primary consumers which are further eaten by the big fishes (120g) representing secondary consumers.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 5

Match the following and select the correct option: [2014]


Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 5
  • Detrivores, (e.g. earthworm) break down detritus into smaller particles.
  • The species that invade a bare area in succession are called pioneer species.
  • The products of ecosystem processes are termed ecosystem services.
    Example: Healthy forest ecosystems purify air and water, mitigate droughts and floods, etc.
  • Natality refers to the number of births during a given period in the population.
31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 6

Edaphic factor refers to:

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 6

An abiotic factor relating to the physical or chemical composition of the soil found in a particular area.
Example: Very alkaline soil may be an edaphic factor limiting the variety of plants growing in a region. 

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 7

Vertical distribution of different species occupying different levels in a biotic community is known as: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 7
  • Stratification is the occurrence of vertical zonation in the ecosystem & indicates the presence of favorable environmental conditions.
    Example: Trees occupy top vertical strata or layer of a forest, shrubs the second. Herbs & grasses occupy the bottom layers.
  • It is absent or poor where environmental conditions are unfavorable.
    Example: Desert ecosystems have very few trees & shrubs.
31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 8

The mass of living material at a trophic level at a particular time is called: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 8

Standing crop is the amount of living biomass in an ecosystem. It indicates the productivity & luxuriance of growth. It is expressed in the form of number or biomass of organisms per unit area

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 9

In an ecosystem the rate of production of organic matter during photosynthesis is termed as:  [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 9

Gross Primary Productivity (GPP) is the rate of production of biomass or accumulation of energy by green plants per unit area per unit time. GPP depends on the chlorophyll content.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 10

Secondary Succession takes place on/in: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 10

Secondary succession takes place in disturbed area having poor vegetation.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 11

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field A possible reason for these changes is that: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 11

The given graph illustrates that population B got success in the grassy field in comparison to population A.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 12

During ecological succession: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 12

The gradual and predictable change, in the composition of species takes place in a given area during ecological succession.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 13

Increase in concentration of the toxicant at successive trophic levels is known as: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 13

Biomagnification means an increase in concentration of toxins through the trophic levels of a food chain.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 14

Industrial melanism is an example of: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 14

Industrial melanism occured in England due to industrial revolution. It caused black coating of moths for the adaptation in the present environment.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 15

In which of the following both pairs have a CORRECT combination? [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 15
  • Carbon and Nitrogen are gaseous nutrient cycle.
  • Sulphur and phosphorus are sedimentary nutrient cycle
31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 16

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 16

Leghemoglobin prevents oxygen poisoning which causes inactivation of nitrogenase.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 17

An association of individuals of different species living in the same habitat and having functional interactions is: [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 17

Biotic community is an association of individuals of different species living in the same habitat and showing functional interactions.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 18

Which of the following is a characteristic feature of the cropland ecosystem? [2016]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 18

Cropland ecosystem is largest anthropogenic ecosystem characterized by less diversity and high productivity.

31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 19

Which of the following would appear as the pioneer organisms on bare rocks? [2016]

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 19
  • Lichens produce small amounts of carbonic acids from their "roots" and these slowly dissolve the rock, releasing nutrients. Other nutrients are obtained from water-borne or air-borne particles of both organic and inorganic materials.
  • The body of a lichen contains an alga; this is able to photosynthesize sugars, some of which are passed on to the fungal component of the lichen. In return the alga gets a tiny but significant amount of shelter within the tissues of the lichen.
31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 20

The term ecosystem was coined by

Detailed Solution for 31 Years NEET Previous Year Questions: Ecosystem - 1 - Question 20

The term ecosystem was first used in 1935 in a publication by British ecologist Arthur Tansley.

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