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NEET Biology (Oct)2020 PYQs
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89 questions in NEET (Oct)2020
Match the items in Column-I with those in Column-II :
Column-I
Column-II
(A)Herbivores-Plants
(I)Commensalism
(B)Mycorrhiza-Plants
(II)Mutualism
(C)Sheep-Cattle
(III)Predation
(D)Orchid-Tree
(IV)Competition
A
(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
B
(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
C
(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
D
(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
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The impact of immigration on population density is:
A
Negative
B
Both positive and negative
C
Neutralized by natality
D
Positive
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According to Alexander von Humboldt:
A
Species richness decreases with increasing area of
exploration
B
Species richness increases with increasing area, but only up to limit
C
There is no relationship between species richness
and area explored.
D
Species richness goes on increasing with increasing
area of exploration
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The rate of decomposition is faster in the ecosystem due to following factors except:
A
Detritus rich in sugars
B
Warm and moist environment
C
Presence of aerobic soil microbes
D
Detritus richer in lignin and chitin
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Which of the following statements is incorrect regarding the phosphorus cycle?
A
Phosphates are the major form of phosphorus
reservoir
B
Phosphorus solubilising bacteria facilitate the release of phosphorus from organic remains
C
There is appreciable respiratory release of
phosphorus into atmosphere
D
It is sedimentary cycle
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In the following in each set a conservation approach and an example of method of conservation are given:
A
(A) and (C)
B
(A) and (D)
C
(B) and (D)
D
(A) and (B)
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Air (Prevention and Control of Pollution) Act was
amended in 1987 to include among pollutants:
A
Vehicular exhaust
B
Allergy causing pollen
C
Noise
D
Particulates of size 2.5 micrometer or below
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For the commercial and industrial production of Citric Acid, which of the following microbes is used?
A
Aspergillus niger
B
Lactobacillus sp
C
Saccharomyces cerevisiae
D
Clostridium butylicum
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Spooling is:
A
Amplification of DNA
B
Cutting of separated DNA bands from the agarose gel
C
Transfer of separated DNA fragments to synthetic
membranes
D
Collection of isolated DNA
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Explanation: Spooling refers to gathering or collecting the isolated DNA strands after extraction, i.e., the DNA that has been purified is spooled around a rod or stick. This is the collection step of DNA isolation. Hence, option 4 is correct.
🧠 Did You Know? In labs, DNA can appear as a white, cottony mass that can be wound or spooled on a glass rod when it precipitates out of solution.
💡 NCERT Memory Line: Spooling = collection of isolated DNA during isolation procedures.
