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NEET • BIOLOGY • ECO SYSTEM
Eco system practice · Mixed difficulty
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91
Medium
91 of 238
Remembering
+4 | -1
The 10% energy transfer law of food chain was given by
View answer and explanation
Correct option: B
Lindemann
Option B (Lindemann) is correct because Lindemann is the scientist credited with proposing the 10% energy transfer law.
92
Easy
92 of 238
Understanding
+4 | -1
The organisms which physically and chemically breaks the complex dead organic remains are known as
View answer and explanation
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.
93
Hard
93 of 238
Remembering
+4 | -1
Pick the correct combination of gaseous
cycle and sedimentary cycle from the list
given below
cycle and sedimentary cycle from the list
given below
View answer and explanation
Correct option: A
Gaseous : C & N; Sedimentary : P & S
Option A (Gaseous : C & N; Sedimentary : P & S) is correct because carbon and nitrogen cycles are primarily gaseous, while phosphorus and sulphur cycles are primarily sedimentary.
94
Medium
94 of 238
Understanding
+4 | -1
A food web is more realistic than a food chain for showing the feeding relationships in an ecosystem because
View answer and explanation
Correct option: D
Producers are usually eaten by many different consumers and most consumers are eaten by more than one predator
Option D (Producers are usually eaten by many different consumers and most consumers are eaten by more than one predator) is correct because food webs show the complex, interconnected feeding relationships in an ecosystem.
95
Easy
95 of 238
Understanding
+4 | -1
The primary consumers in a pond ecosystem are
View answer and explanation
Correct option: B
Zooplankton
The correct answer is B (Zooplankton) because zooplankton are primary consumers in a pond ecosystem, feeding on phytoplankton.
96
Medium
96 of 238
Understanding
+4 | -1
Some of the stages in the hydrarch are labelled as
I. Marsh meadow stage
II. Reed swamp stage
III. Submerged plant stage
IV. Phytoplankton stage
V. Submerged free floating plant stage
Identify the choice that represents the correct sequence of these stages
I. Marsh meadow stage
II. Reed swamp stage
III. Submerged plant stage
IV. Phytoplankton stage
V. Submerged free floating plant stage
Identify the choice that represents the correct sequence of these stages
View answer and explanation
Correct option: A
IV, III, V, II and I
Option A (IV, III, V, II and I) is correct because it represents the correct sequence of stages in hydrarch succession, starting from phytoplankton and ending with marsh meadow.
97
Easy
97 of 238
Understanding
+4 | -1
For very large area like entire continents, the value of Z in the range of:
View answer and explanation
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.
98
Medium
98 of 238
Understanding
+4 | -1
…A… is required for higher primary productivity. …B… have the lowest primary productivity as the soil is deficient in moisture.
Choose the correct option for A and B
Choose the correct option for A and B
View answer and explanation
Correct option: A
A-Rain; B-desert
Option A (A-Rain; B-desert) is correct because rainfall promotes higher primary productivity, while deserts, lacking moisture, have the lowest.
99
Medium
99 of 238
Remembering
+4 | -1
In an ecosystem, the cycling of nutrient is known as
View answer and explanation
Correct option: D
Biogeochemical cycle
Option D (Biogeochemical cycle) is correct because the cycling of nutrients within an ecosystem involves both biological and geological (abiotic) components.
100
Easy
100 of 238
Remembering
+4 | -1
The ultimate energy source of ecosystem is
View answer and explanation
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.
101
Easy
101 of 238
Remembering
+4 | -1
Energy flow in ecosystem is
View answer and explanation
Correct option: B
Unidirectional
Option B (Unidirectional) is correct because energy flow in an ecosystem is always unidirectional, moving from producers to consumers.
102
Medium
102 of 238
Application
+4 | -1
GPP in an ecosystem is 1000 kJ.Ifproducers utilise20% of GPP for respiration, how much of energy will be available at secondary
View answer and explanation
Correct option: A
8 kJ
Option B (80 Kj) is correct because, after producers use 20% of GPP for respiration, 80% remains as NPP, and 10% of that is available at the secondary consumer level.
103
Medium
103 of 238
Understanding
+4 | -1
What will happen if all the bacteria and fungi are destroyed?
View answer and explanation
Correct option: C
Dead bodies and excretions will pile up
Option C (Dead bodies and excretions will pile up) is correct because bacteria and fungi are essential for decomposition, and without them, organic matter would accumulate.
104
Easy
104 of 238
Remembering
+4 | -1
The decomposers in an ecosystem are
View answer and explanation
Correct option: B
Micro consumers
Option B (Micro consumers) is correct because decomposers, primarily bacteria and fungi, are microorganisms that break down organic matter.
105
Easy
105 of 238
Understanding
+4 | -1
Food chain refers to
View answer and explanation
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.
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106
Easy
106 of 238
Understanding
+4 | -1
Which of the following pyramid of numbers in ecology is not upright?
View answer and explanation
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.
107
Hard
107 of 238
Understanding
+4 | -1
Which of the following statements concerning acid precipitation is incorrect?
View answer and explanation
Correct option: A
Acids that enter the atmosphere primarily affect ecosystems located less than 100 kilometers from the source of the pollution
Option A is correct because acids can travel long distances in the atmosphere, affecting ecosystems far from the pollution source.
108
Medium
108 of 238
Understanding
+4 | -1
In the following, there is no difference.
View answer and explanation
Correct option: B
Primary consumers and herbivores
Option B (Primary consumers and herbivores) is correct because primary consumers are, by definition, herbivores that consume producers.
109
Easy
109 of 238
Remembering
+4 | -1
The species that come to appear in bare area
are called
are called
View answer and explanation
Correct option: B
Pioneer species
Option B is correct because pioneer species are the first to colonize a bare area, initiating ecological succession.
110
Medium
110 of 238
Remembering
+4 | -1
Littoral zone is located along the
View answer and explanation
Correct option: B
Sea
Option B (Sea) is correct because the littoral zone is the area of a sea, lake, or river that is close to the shore.
111
Easy
111 of 238
Understanding
+4 | -1
Which of the following organisms form the decomposers?
View answer and explanation
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.
112
Easy
112 of 238
Understanding
+4 | -1
Which statement is true corresponding to the given food chain?
Grass Rabbits Snakes Hawks
Grass Rabbits Snakes Hawks
View answer and explanation
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.
113
Hard
113 of 238
Remembering
+4 | -1
The two vegetations of an ecosystem are separated by:
View answer and explanation
Correct option: B
Ecoline
The correct answer is B (Ecoline) because an ecoline represents the boundary or transition zone between two different vegetation types or ecosystems.
114
Easy
114 of 238
Remembering
+4 | -1
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
View answer and explanation
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.
115
Medium
115 of 238
Analyzing
+4 | -1
Study the following pairs.
I. Peperomia Leaf succulent Leaf epidermal cells store water.
II. Calotropsis Non-succulent Root cells with thickend cell walls.
III. Tribulus Ephermeral Stem stores water.
IV. Ammophila Dicot plant Rolling in of leaves to check water loss Identify the correct pair of answer
I. Peperomia Leaf succulent Leaf epidermal cells store water.
II. Calotropsis Non-succulent Root cells with thickend cell walls.
III. Tribulus Ephermeral Stem stores water.
IV. Ammophila Dicot plant Rolling in of leaves to check water loss Identify the correct pair of answer
View answer and explanation
Correct option: A
I, II
Option A (I, II) is correct because Peperomia and Calotropis exhibit the described adaptations for water storage and conservation.
116
Hard
116 of 238
Understanding
+4 | -1
Which of the following statement(s) is/are correct about biogeochemical cycle?
(i) Gaseous exchanges of phosphorus between organism and environment are negligible.
(ii) All biogeochemical cycles include both organisms and non-living components.
(iii) Most elements remain longest in the living portion of their cycle.
(iv) The chemical elements used by organisms in large quantities cycle back and forth between organisms and environment.
(i) Gaseous exchanges of phosphorus between organism and environment are negligible.
(ii) All biogeochemical cycles include both organisms and non-living components.
(iii) Most elements remain longest in the living portion of their cycle.
(iv) The chemical elements used by organisms in large quantities cycle back and forth between organisms and environment.
View answer and explanation
Correct option: B
(i), (ii) and (iv)
Option B ((i), (ii) and (iv)) is correct because gaseous exchanges of phosphorus are negligible, all biogeochemical cycles include organisms and non-living components, and elements used in large quantities cycle between organisms and the environment.
117
Easy
117 of 238
Remembering
+4 | -1
Secondary productivity is
View answer and explanation
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.
118
Hard
118 of 238
Understanding
+4 | -1
Consider the following statements.
(i) An ecosystem is a functional unit of nature and comprises abiotic and biotic components.
(ii) Abiotic components are organic materials.
(iii) Biotic components are producers, consumers and decomposers.
(iv) Energy flow is bidirectional.
Which two statements are correct?
(i) An ecosystem is a functional unit of nature and comprises abiotic and biotic components.
(ii) Abiotic components are organic materials.
(iii) Biotic components are producers, consumers and decomposers.
(iv) Energy flow is bidirectional.
Which two statements are correct?
View answer and explanation
Correct option: D
(i) and (iii)
Option D ((i) and (iii)) is correct because an ecosystem includes abiotic and biotic components, and biotic components consist of producers, consumers, and decomposers.
119
Easy
119 of 238
Remembering
+4 | -1
Reservoir for phosphorus cycle is
View answer and explanation
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.
120
Easy
120 of 238
Understanding
+4 | -1
Most diverse organisms of an ecosystem are
View answer and explanation
Correct option: D
Decomposers
Option D (Decomposers) is correct because decomposers, including bacteria and fungi, are incredibly diverse in their metabolic capabilities and species.
Revision notes and key takeaways
Review ECO SYSTEM in your textbook or class notes, then use this set to check your understanding.
Showing 91-120 of 238 questions