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NEET • BIOLOGY • ECO SYSTEM
Eco system practice · Easy
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61
Easy
61 of 85
Remembering
+4 | -1
Decomposition of organic matter is brought about by
View answer and explanation
Correct option: C
Microorganisms
Option C (Microorganisms) is correct because bacteria and fungi are the primary decomposers of organic matter.
62
Easy
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Understanding
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Which of the following statements for pyramid of energy is INCORRECT, whereas remaining stands correct?
View answer and explanation
Correct option: B
It may be inverted
Option B (It may be inverted) is correct because the pyramid of energy is *always* upright, never inverted.
63
Easy
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Remembering
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The ecological pyramid that is always upright
View answer and explanation
Correct option: A
Pyramid of energy
Option A (Pyramid of energy) is always upright because energy decreases at each successive trophic level due to energy loss as heat.
64
Easy
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Understanding
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Identify the possible link “A” in the following food chain.
View answer and explanation
Correct option: C
Cobra
Option C (Cobra) is the most likely link because cobras are known to prey on frogs and are, in turn, preyed upon by eagles.
65
Easy
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Understanding
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If a predator is over exploitation its prey in a ecosystem then what might be consequences of this?
View answer and explanation
Correct option: C
Both (a) and (b)
Option C (Both (a) and (b)) is correct because overexploitation can lead to the extinction of both the prey and, subsequently, the predator.
66
Easy
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Understanding
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Secondary producers in an ecosystem are
View answer and explanation
Correct option: B
Grazers & Browsers
The correct answer is B (Grazers & Browsers) because secondary producers are organisms that consume primary producers (autotrophic plants). Grazers and browsers fit this description.
67
Easy
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Understanding
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What is the available biomass for the consumption to the heterotrophs (particularly herbivores)?
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Correct option: B
NPP
Option B (NPP) is correct because Net Primary Productivity (NPP) represents the biomass available for consumption by heterotrophs, particularly herbivores.
68
Easy
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Understanding
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Assertion: Mosses and lichens are said to form the pioneer community in xerarch succession.
Reason: It is because during the course of succession these species get established later.
Reason: It is because during the course of succession these species get established later.
View answer and explanation
Correct option: C
If assertion is true but reason is false
Option C (If assertion is true but reason is false) is correct because mosses and lichens are pioneer species, but they get established *early* in succession, not later.
69
Easy
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Remembering
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The organic substance, which decompose slowly are
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because chitin, lignin, and cellulose are all complex organic substances that decompose slowly.
70
Easy
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Understanding
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Which of the following factor is contributing to an overload of the carbon cycle?
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Correct option: C
Deforestation
Option C (Deforestation) is correct because deforestation reduces the number of trees available to absorb carbon dioxide from the atmosphere, thus contributing to an overload of the carbon cycle.
71
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Understanding
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An inverted pyramid of …A… may occasionally be observed in …B… communities
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Correct option: C
A-biomass; B-marine
Option C (A-biomass; B-marine) is correct because inverted pyramids of biomass can occur in marine ecosystems where the biomass of phytoplankton is less than that of zooplankton.
72
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Understanding
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Succession on bare land converts it into
View answer and explanation
Correct option: C
Forest with mesic condition
Option C (Forest with mesic condition) is correct because both hydrarch and xerarch successions lead to a mesic (moderate moisture) condition.
73
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Remembering
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Ecosystem may be defined as
View answer and explanation
Correct option: D
All plants and animal species along with their environment
Option D is correct because an ecosystem includes all plants and animal species along with their environment, encompassing both biotic and abiotic factors.
74
Easy
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Understanding
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Which one of the following types of organisms occupy more than one trophich level in a pond ecosystem?
View answer and explanation
Correct option: B
Fish
Option B (Fish) is correct because fish can occupy multiple trophic levels in a pond ecosystem, feeding on both primary consumers (zooplankton) and other secondary consumers.
75
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Remembering
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Sunken stomata is found in the leaves of
View answer and explanation
Correct option: C
Nerium
Option C is correct because Nerium is a xerophyte, and sunken stomata are a characteristic adaptation to reduce water loss in such plants.
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76
Easy
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Application
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Calculate the amount of energy available at the level of lion in the given food chain if the energy available at grass level is
Grass Cow Lion
Grass Cow Lion
View answer and explanation
Correct option: B
Option B () is correct because energy transfer in a food chain follows the 10% rule, where only about 10% of energy is transferred to the next trophic level.
77
Easy
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Understanding
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Assertion: With time ecological succession can turn a lake into a dryland forest.
Reason: Through ecological succession a bare rock can become a forest.
Reason: Through ecological succession a bare rock can become a forest.
View answer and explanation
Correct option: B
If both assertion and reason are true but reason is not the correct explanation of assertion
Option B (If both assertion and reason are true but reason is not the correct explanation of assertion) is correct because both statements are true, but the reason does not explain how a lake turns into a dryland forest.
78
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Analyzing
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Given below are two Statement : one is labelled as Assertion (A) and the other is labelled as Reason
(R)
Assertion (A): Despite occupying about 70percent of the surface, the productivity of oceans are only
55 billion tons.
Reason (R): In deep sea productivity is limited by light and nitrogen
In the light above statements, choose the most appropriate answer from the options given below.
(R)
Assertion (A): Despite occupying about 70percent of the surface, the productivity of oceans are only
55 billion tons.
Reason (R): In deep sea productivity is limited by light and nitrogen
In the light above statements, choose the most appropriate answer from the options given below.
View answer and explanation
Correct option: C
A and R are true and R is the correct explanation of A
Option C (A and R are true and R is the correct explanation of A) is correct because both the assertion and reason are true, and the reason correctly explains why ocean productivity is relatively low despite its large surface area.
79
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Understanding
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In relation to decomposition, which one of the following statements is correct?
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Correct option: D
Decomposition is largely an oxygen – requiring process.
Option D (Decomposition is largely an oxygen – requiring process) is correct because aerobic conditions generally promote faster decomposition rates.
80
Easy
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Remembering
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The pioneer community in xerarch succession is
View answer and explanation
Correct option: C
Lichens
Option C is correct. Lichens are the pioneer species in xerarch succession because they can colonize bare rock and break it down.
81
Easy
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Understanding
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In ecological pyramid the base always represent the …A… and the apex represents …B… Here A and B represents
View answer and explanation
Correct option: A
A-producers; B-top level consumers
Option A (A-producers; B-top level consumers) is correct because producers form the base of the ecological pyramid, and top-level consumers are at the apex.
82
Easy
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Remembering
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An individual transitional communities in ecological succession are termed as
View answer and explanation
Correct option: C
Seral communities
Option C (Seral communities) is correct because transitional communities in ecological succession are called seral communities or seral stages.
83
Easy
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Remembering
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Which one of the following is no used for construction of ecological pyramids?
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Correct option: D
Fresh weight
Option D (Fresh weight) is not used for constructing ecological pyramids because it includes water content, which can vary greatly and distort the representation of actual organic matter.
84
Easy
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Remembering
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Which one of the following is involved in sedimentary cycle?
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Correct option: D
Phosphorus
Option D (Phosphorus) is correct because the phosphorus cycle is primarily a sedimentary cycle, involving the weathering of rocks.
85
Easy
85 of 85
Remembering
+4 | -1
The rate of formation of new organic matter by goat in a forest ecosystem is called
View answer and explanation
Correct option: D
Secondary productivity
Option D (Secondary productivity) is the rate of formation of new organic matter by consumers, such as a goat, in an ecosystem.
Revision notes and key takeaways
Review ECO SYSTEM in your textbook or class notes, then use this set to check your understanding.
Showing 61-85 of 85 questions