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NEET • BIOLOGY • ECO SYSTEM
Eco system practice · Medium
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31
Medium
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Remembering
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The process by which water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts is called as
View answer and explanation
Correct option: B
Leaching
Option B (Leaching) is correct because leaching is the process where water-soluble nutrients are carried down through the soil and may precipitate as unavailable salts.
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Remembering
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Ecological succession is a
View answer and explanation
Correct option: A
Long term process
Option A (Long term process) is correct because ecological succession involves gradual changes in species composition over extended periods.
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Analyzing
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Assertion: Green plants only show primary productivity.
Reason: Chemosynthesizers are responsible for primary productivity also.
Reason: Chemosynthesizers are responsible for primary productivity also.
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 is correct because both green plants and chemosynthesizers can perform primary productivity, but the reason doesn't explain why the assertion is true.
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Understanding
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Gross primary productivity is utilised by …A… in …B…
Choose the correct option for A and B
Choose the correct option for A and B
View answer and explanation
Correct option: B
A-plants; B-respiration
Option B (A-plants; B-respiration) is correct because gross primary productivity is the total amount of energy captured by plants, and some of this energy is used by the plants for respiration.
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Remembering
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At each step of food chain when food energy is transferred from one trophic level to the next higher trophic level only about 10% of energy is passed onto next level. This is known as …A… given by …B… in …C… . Here A, B and C Refers to
View answer and explanation
Correct option: B
A-10% law, B-Lindeman, C-1942
Option B (A-10% law, B-Lindeman, C-1942) is correct because it accurately identifies the 10% law of energy transfer, the scientist who proposed it, and the year it was proposed.
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Remembering
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Stratification occurs in
View answer and explanation
Correct option: B
Tropical forest
Option B (Tropical forest) is correct because tropical forests exhibit distinct vertical layers (strata) of vegetation.
37
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Analyzing
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Assertion: The consequence of the second law of thermodynamics is the loss of biologically useful energy as heat with every energy transfer in a food chain.
Reason: Energy does not permanently remain trapped in any organism, it is either passed on to a higher trophic level or becomes available to detrivores and decomposers after the organism dies.
Reason: Energy does not permanently remain trapped in any organism, it is either passed on to a higher trophic level or becomes available to detrivores and decomposers after the organism dies.
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 is correct because both the assertion and the reason are true, but the reason does not directly explain why energy is lost as heat (second law of thermodynamics). The second law is about entropy increase, not just energy transfer.
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Analyzing
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Go through the following pairs and choose the correct pairs from the option given below
I. Nerium Sunken lower epidermis of leaves to stomata reduces loss of water
II. Calotropis Non-succulent Root cells with thickened
cell walls
III. Peperomia Leaf succulent Leaf epidermal cell, store
water
IV. Ammophila Dicot Curl their leaves to minimise loss of water
V. Tribulus Ephemeral Water is stored in stem
I. Nerium Sunken lower epidermis of leaves to stomata reduces loss of water
II. Calotropis Non-succulent Root cells with thickened
cell walls
III. Peperomia Leaf succulent Leaf epidermal cell, store
water
IV. Ammophila Dicot Curl their leaves to minimise loss of water
V. Tribulus Ephemeral Water is stored in stem
View answer and explanation
Correct option: B
I, II and III are correct pairs
Option B (I, II and III are correct pairs) is correct because Nerium, Calotropis, and Peperomia exhibit the described adaptations to reduce water loss or store water.
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Understanding
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Consider the following ecosystem
I. Pond ecosystem II. Terrestrial ecosystem
III. Oceans ecosystem IV. Forest ecosystem
There are mainly three food chain in natural ecosystem’s grazing food chain, detritus food chain, parasite food chain
Find out which of the following will have grazing food chain?
I. Pond ecosystem II. Terrestrial ecosystem
III. Oceans ecosystem IV. Forest ecosystem
There are mainly three food chain in natural ecosystem’s grazing food chain, detritus food chain, parasite food chain
Find out which of the following will have grazing food chain?
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because grazing food chains, which start with producers, exist in pond, terrestrial, and ocean ecosystems.
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Remembering
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Phosphorus is the major constituent of
I. biological membranes
II. nucleic acids
III. cellular energy transfer system
Choose the correct option
I. biological membranes
II. nucleic acids
III. cellular energy transfer system
Choose the correct option
View answer and explanation
Correct option: D
I, II and III
Option D (I, II and III) is correct because phosphorus is indeed a major constituent of biological membranes, nucleic acids, and cellular energy transfer systems.
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Remembering
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Plant successions occurring in a sandy area is
View answer and explanation
Correct option: A
Psammosere
Option A is correct because plant succession occurring in a sandy area is called a psammosere.
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Understanding
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Primary succession occurs in?
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because primary succession occurs on newly formed or exposed land with no existing soil, such as newly cooled lava, bare rock, or a newly created pond.
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Understanding
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What is the medium by which carbon cycle takes place?
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because the carbon cycle involves the atmosphere, oceans, and living/dead organisms as mediums for carbon exchange.
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Remembering
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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.
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Understanding
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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.
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Understanding
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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.
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Understanding
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…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.
48
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Remembering
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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.
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Application
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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.
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Understanding
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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.
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Understanding
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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.
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Remembering
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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.
53
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Analyzing
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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.
54
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Analyzing
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Assertion: Pyramid of energy may be upright or inverted.
Reason: Only 20% of energy goes to next trophic level.
Reason: Only 20% of energy goes to next trophic level.
View answer and explanation
Correct option: D
If both the Assertion and Reason are incorrect.
If both the Assertion and Reason are incorrect. Pyramid of energy is always upright. Only 10% of energy goes to next trophic level.
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Analyzing
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Assertion (A): In a terrestrial ecosystem, detritus food chain is a major conduit for energy flow.
Reason (R): Solar energy is direct source of energy supply in detrirus food chain.
Reason (R): Solar energy is direct source of energy supply in detrirus food chain.
View answer and explanation
Correct option: C
If A is true but R is false
Option C is correct. Assertion A is true because detritus food chains are significant in terrestrial ecosystems, but Reason R is false because the energy source is dead organic matter, not solar energy.
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Analyzing
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If is removed totally from the biosphere, which organisms will be affected first?
View answer and explanation
Correct option: B
Secondary consumers
Option C (Producers) is correct because producers are the primary organisms that utilize for photosynthesis. Removing directly impacts their ability to produce food.
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Understanding
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In the phosphorus cycle, weathering makes phosphate available first to
View answer and explanation
Correct option: C
Producers
Option C (Producers) is correct because weathering releases phosphate into the soil, which is then absorbed by producers (plants).
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Remembering
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The pyramid of biomass will be inverted in the ecosystem of
View answer and explanation
Correct option: B
Ponds
Option B (Ponds) is correct. In pond ecosystems, the pyramid of biomass can be inverted because the biomass of phytoplankton (producers) is less than that of zooplankton (consumers) at certain times.
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Understanding
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Consider the following statements about food web
I. One organism hold more than one position
II. The flow of energy is very difficult to calculate
III. Instead of straight line it is a series of branching lines
IV. Competition is amongst the members of same and different trophic levels
Which of the statements given above are correct?
I. One organism hold more than one position
II. The flow of energy is very difficult to calculate
III. Instead of straight line it is a series of branching lines
IV. Competition is amongst the members of same and different trophic levels
Which of the statements given above are correct?
View answer and explanation
Correct option: D
I, II, III and IV
Option D (I, II, III and IV) is correct because all the statements accurately describe characteristics of food webs.
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Application
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The tiger biomass is 10 kg in grass-deer-tiger food chain. The grass biomass will be
View answer and explanation
Correct option: C
One tonne
Option D (10 tonne) is correct because, following the 10% rule, the grass biomass must be 100 times the tiger biomass.
Revision notes and key takeaways
Review ECO SYSTEM in your textbook or class notes, then use this set to check your understanding.
Showing 31-60 of 111 questions