Number of humans forming a chain for food

Animals gathered near a source of food

Different communities of plants and microbes interact with their physico-chemical environments

A localized assemblage of several plants and animals

An assemblage of plants, animals and their surroundings

It is slower if detritus is rich in sugar and nitrogen

Low temperature and anaerobiosis promote the decomposition resulting in build up of organic materials

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NEET • BIOLOGY • ECO SYSTEM

Eco system practice · Easy

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31 Easy

31 of 85

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Decomposers are

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Correct option: D

Heterotrophs

Option D (Heterotrophs) is correct because decomposers obtain their nutrition from dead organic matter.

32 Easy

32 of 85

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Assertion: Secondary succession is faster than primary succession.

Reason: Some soil or sediments are present.

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Correct option: A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because secondary succession starts on pre-existing soil, making it faster than primary succession.

33 Easy

33 of 85

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The organisms which physically and chemically breaks the complex dead organic remains are known as

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Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because scavengers and decomposers both break down dead organic remains, physically and chemically.

34 Easy

34 of 85

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The primary consumers in a pond ecosystem are

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Correct option: B

Zooplankton

The correct answer is B (Zooplankton) because zooplankton are primary consumers in a pond ecosystem, feeding on phytoplankton.

35 Easy

35 of 85

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For very large area like entire continents, the value of Z in the range of:

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Correct option: C

0.6 to 1.2

Option C (0.6 to 1.2) is the correct range for the Z value in the species-area relationship when considering very large areas like entire continents.

36 Easy

36 of 85

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The ultimate energy source of ecosystem is

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Correct option: A

Solar energy

Option A (Solar energy) is correct because solar energy is the ultimate source of energy for most ecosystems on Earth.

37 Easy

37 of 85

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Energy flow in ecosystem is

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Correct option: B

Unidirectional

Option B (Unidirectional) is correct because energy flow in an ecosystem is always unidirectional, moving from producers to consumers.

38 Easy

38 of 85

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The decomposers in an ecosystem are

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Correct option: B

Micro consumers

Option B (Micro consumers) is correct because decomposers, primarily bacteria and fungi, are microorganisms that break down organic matter.

39 Easy

39 of 85

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Food chain refers to

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Correct option: C

Transfer of energy from producers to consumers

Option C (Transfer of energy from producers to consumers) is correct because a food chain describes the sequence of energy transfer between organisms at different trophic levels.

40 Easy

40 of 85

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Which of the following pyramid of numbers in ecology is not upright?

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Correct option: C

Tree ecosystem

The correct answer is C (Tree ecosystem) because in a tree ecosystem, the pyramid of numbers is inverted, with one tree supporting many herbivores and even more parasites.

41 Easy

41 of 85

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The species that come to appear in bare area
are called

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Correct option: B

Pioneer species

Option B is correct because pioneer species are the first to colonize a bare area, initiating ecological succession.

42 Easy

42 of 85

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Which of the following organisms form the decomposers?

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Correct option: D

Both (b) and (c)

Option D (Both (b) and (c)) is correct because both bacteria and saprophytic fungi are major decomposers in ecosystems.

43 Easy

43 of 85

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Which statement is true corresponding to the given food chain?
Grass

\to

Rabbits

\to

Snakes

\to

Hawks

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Correct option: B

Each prey population has a greater biomass than its predator population.

Option B (Each prey population has a greater biomass than its predator population) is correct because energy is lost at each trophic level, so the biomass of prey must be greater to support the predator population.

44 Easy

44 of 85

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The rate of which organic compounds are formed in a green plant or in a population of green plants per unit time and area is known as the

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Correct option: B

Gross primary productivity

Option B (Gross primary productivity) is correct because it refers to the total rate of organic matter production before any is used for respiration.

45 Easy

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Secondary productivity is

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Correct option: A

The rate of formation of new organic matter by consumers

Option A (The rate of formation of new organic matter by consumers) is the correct definition of secondary productivity.

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46 Easy

46 of 85

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Reservoir for phosphorus cycle is

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Correct option: C

Located in Earth’s crust

Option C (Located in Earth’s crust) is correct because phosphorus is primarily stored in rocks and minerals within the Earth's crust.

47 Easy

47 of 85

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Most diverse organisms of an ecosystem are

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Correct option: D

Decomposers

Option D (Decomposers) is correct because decomposers, including bacteria and fungi, are incredibly diverse in their metabolic capabilities and species.

48 Easy

48 of 85

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In primary succession in water, the pioneer species are

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Correct option: B

Small phytoplanktons

Option B is correct because in primary succession in water, small phytoplanktons are the pioneer species that initially colonize the area.

49 Easy

49 of 85

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Phosphorus is required for making
I. shell
II. bones
III. teeth
Choose the correct option

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Correct option: D

I, II and III

Option D (I, II and III) is correct because phosphorus is a key component of shells, bones, and teeth.

50 Easy

50 of 85

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An ecosystem is

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Correct option: A

Different communities of plants, animals and microbes interact together with their physico-chemical equations

Option A (Different communities of plants, animals and microbes interact together with their physico-chemical equations) is the most complete definition of an ecosystem.

51 Easy

51 of 85

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In an ecosystem the rate of production of organic matter by producers which is available to herbivores is

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Correct option: A

Net primary productivity

Option A (Net primary productivity) is correct because NPP represents the rate of organic matter production by producers available to herbivores after accounting for respiration.

52 Easy

52 of 85

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Which specialised cell provides interconnectivity for air spaces?

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Correct option: A

Parenchyma

Option A is correct. Parenchyma cells, due to their thin walls and intercellular spaces, facilitate interconnectivity for air spaces in plant tissues.

53 Easy

53 of 85

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Rabbits eats grass and other plants to survive, but they do not eat animals. Refer the best category for rabbits?

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Correct option: D

Herbivores

Option D (Herbivores) is correct because rabbits consume plants and not animals, fitting the definition of herbivores.

54 Easy

54 of 85

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The lentic ecosystem includes

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Correct option: B

Standing water

Option B (Standing water) is correct because lentic ecosystems are characterized by still or standing water, such as lakes and ponds.

55 Easy

55 of 85

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The products of decomposition process are

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Correct option: D

Both (a) and (b)

Option D (Both (a) and (b)) is correct because decomposition results in the formation of humus and the release of inorganic nutrients.

56 Easy

56 of 85

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The process of accumulation of a dark coloured amorphous substance that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate is called

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Correct option: B

Humification

Option B (Humification) is correct because humification is the process of forming humus, a dark, amorphous substance resistant to decomposition.

57 Easy

57 of 85

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In a food chain, the total amount of living material is depicted by

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Correct option: A

Pyramid of biomass

Option A (Pyramid of biomass) depicts the total amount of living material in a food chain at different trophic levels.

58 Easy

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Decomposition is

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Correct option: A

Controlled by chemical composition of detritus and climatic factors

Option A (Controlled by chemical composition of detritus and climatic factors) is correct because the rate of decomposition is influenced by the nature of the detritus and environmental conditions.

59 Easy

59 of 85

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In grazing food chain energy comes from

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Correct option: B

Sun

Option B (Sun) is correct because in a grazing food chain, the energy originates from the sun, which is captured by producers.

60 Easy

60 of 85

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Which of the following statements are correct?
I. Least productive ecosystems are deserts and deep lakes
II. Sugarcane is the most productive crop
III. Most productive ecosystem is coral reef
Choose the correct option

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Correct option: D

I, II and III

Option D (I, II and III) is correct because all three statements are accurate: deserts and deep lakes are less productive, sugarcane is a highly productive crop, and coral reefs are among the most productive ecosystems.

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