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NEET • BIOLOGY • ECO SYSTEM
Eco system practice · Medium
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91
Medium
91 of 111
Remembering
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Which of the following two organisms are producers?
View answer and explanation
Correct option: A
Plants and phytoplanktons
Option A is correct because plants and phytoplanktons are producers, meaning they create their own food through photosynthesis.
92
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Understanding
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The statement, ‘Tiger is in the apex of food chain’, indicates
View answer and explanation
Correct option: D
Tiger is dependent upon large number of herbivores and even more number of trees in forest
Option D (Tiger is dependent upon large number of herbivores and even more number of trees in forest) is correct because a top predator like a tiger relies on a complex food web with numerous herbivores and even more primary producers (trees) at the base.
93
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Understanding
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Which of these decreases in climax stage than the several stages during ecological succession?
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Correct option: B
Net community productivity
Option B (Net community productivity) is correct because net community productivity decreases as an ecosystem approaches its climax stage due to increased respiration.
94
Medium
94 of 111
Analyzing
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Consider the following statements concerning food chains:
i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
ii) Removal of most of the carnivores resulted in an increased population of deers.
iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss.
iv)The length of food chains may vary from 2 to 8 trophic levels.
Which two of the above statements are correct?
i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
ii) Removal of most of the carnivores resulted in an increased population of deers.
iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss.
iv)The length of food chains may vary from 2 to 8 trophic levels.
Which two of the above statements are correct?
View answer and explanation
Correct option: A
(ii) and (iii)
Option A ((ii) and (iii)) is correct because the removal of carnivores increases deer population, and energy loss limits food chain length.
95
Medium
95 of 111
Remembering
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One model that shows how energy passes from one trophic level to another trophic level is called
View answer and explanation
Correct option: A
An energy link
Option B (A food chain) is the correct answer because a food chain illustrates the transfer of energy from one trophic level to another.
96
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Understanding
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A bear that eats a fish that further ate bugs that ate algae is a
View answer and explanation
Correct option: D
Tertiary consumer
Option D (Tertiary consumer) is correct because the bear is eating a fish (secondary consumer) that ate bugs (primary consumer) that ate algae (primary producer), placing the bear at the tertiary consumer level.
97
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Understanding
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What percentage of Herbivores chemical energy is transferred to the chemical energy within the carnivore tissue?
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Correct option: D
0.1
Option D (0.1) is correct because, on average, only about 10% (or 0.1) of the energy from one trophic level is transferred to the next.
98
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Understanding
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All of the following can be adaptations of xerophytes, except
View answer and explanation
Correct option: C
Poorly developed roots
Option C (Poorly developed roots) is correct because xerophytes have *well* developed roots to absorb water from deep or wide areas.
99
Medium
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Application
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In the given food chain, what will be the energy available to carnivore II?
Sunlight (100000 kcal) Producer Herbivore Carnivore I Carnivore II
Sunlight (100000 kcal) Producer Herbivore Carnivore I Carnivore II
View answer and explanation
Correct option: B
1 kcal
Option B (1 kcal) is correct because, with a 10% energy transfer at each trophic level, the energy available to Carnivore II is 100000 * 0.1 * 0.1 * 0.1 * 0.1 kcal = 1 kcal.
100
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Remembering
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The process of which humus is degraded by some microbes to release inorganic nutrients is known as
View answer and explanation
Correct option: A
Mineralization
Option A (Mineralization) is correct because mineralization is the process by which microbes decompose humus, releasing inorganic nutrients.
101
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Remembering
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Primary succession on rocks starts with
View answer and explanation
Correct option: A
Lichen
Option A (Lichen) is correct because lichens are often the first organisms to colonize bare rock in primary succession, breaking down the rock to form soil.
102
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Remembering
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The pioneer species on the bare rocks are?
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Correct option: A
Lichens
Option A is correct because lichens are the pioneer species on bare rocks, capable of breaking down the rock and initiating soil formation.
103
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Analyzing
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Assertion (A): Pyramid of biomass is inverted in aquatic ecosystem.
Reason (R): Longivity increases with the rise in trophic levels.
Reason (R): Longivity increases with the rise in trophic levels.
View answer and explanation
Correct option: A
Both A & R are correct, R is correct explanation to A
Option C (If A is true but R is false) is correct because the pyramid of biomass can be inverted in aquatic ecosystems, but longevity doesn't explain this inversion.
104
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Remembering
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Which one of the following is a sedimentary cycle?
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Correct option: A
Sulphur cycle
Option A (Sulphur cycle) is correct because the sulphur cycle primarily involves the weathering of rocks and the decomposition of organic matter, making it a sedimentary cycle.
105
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Understanding
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Which of the given is not seral community w.r.t. xerarch succession?
(A) Lichens (B) Bryophytes (C) Herbs (D) Forest
(A) Lichens (B) Bryophytes (C) Herbs (D) Forest
View answer and explanation
Correct option: C
Both (A) and (D)
Option C (Both (A) and (D)) is correct because Lichens and Forest are not seral communities, Lichens are pioneer and Forest is climax community in xerarch succession.
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106
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Analyzing
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Mark the odd one out regarding trophic level of the organisms.
View answer and explanation
Correct option: D
Hydra
Option D (Hydra) is the odd one out. Zooplankton, tadpoles, and grasshoppers are primarily herbivores or primary consumers, while hydra are carnivores.
107
Medium
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Analyzing
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The process by which a lake ecosystem is altered by eutrophication involves several stages, each causing the next. Which of the following stages would occur second in the chain of causation?
View answer and explanation
Correct option: A
Algal blooms occur
Option A (Algal blooms occur) is correct because increased phosphorus leads to algal blooms, which then cause other problems.
108
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Remembering
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The species that invade a bare area in ecological succession are called
View answer and explanation
Correct option: D
Pioneer species
Option D (Pioneer species) is correct because pioneer species are the first to colonize a bare area during ecological succession.
109
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Remembering
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Which of the following have sunken stomata?
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Correct option: A
Nerium
Option A is correct because Nerium is a xerophyte adapted to dry conditions, and sunken stomata help reduce water loss.
110
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Analyzing
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Find the incorrect statement
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Correct option: C
Detritus food chain is not at all connected with grazing food chain at any level
Option C is the incorrect statement. Detritus and grazing food chains are interconnected, as energy and nutrients can flow between them.
111
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Remembering
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Word detritus includes
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because detritus includes dead plant parts, remains of animals, and animal excretions.
Revision notes and key takeaways
Review ECO SYSTEM in your textbook or class notes, then use this set to check your understanding.
Showing 91-111 of 111 questions