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NEET Biology 2021 PYQs
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100 questions in NEET 2021
Inspite of interspecific competition in nature, which mechanism the competing species might have
evolved for their survival?
A
Resource partitioning
B
Competitive release
C
Mutualism
D
Predation
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Amensalism can be represented as:
A
Species A (–); Species B (0)
B
Species A (+); Species B (+)
C
Species A (–); Species B (–)
D
Species A (+); Species B (0)
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The amount of nutrients, such as carbon, nitrogen,
phosphorus and calcium present in the soil at any
given time, is referred as:
A
Climax
B
Climax community
C
Standing state
D
Standing crop
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Which of the following statements is not correct?
A
Pyramid of biomass in sea is generally inverted.
B
Pyramid of biomass in sea is generally upright.
C
Pyramid of energy is always upright.
D
Pyramid of numbers in a grassland ecosystem
is upright.
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In the equation GPP–R = NPP.
A
Radiant energy
B
Retardation factor
C
Environment factor
D
Respiration losses
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Which of the following statements is correct?
A
Fusion of two cells is called Karyogamy.
B
Fusion of protoplasms between two motile on
non-motile gametes is called plasmogamy.
C
Organisms that depend on living plants are
called saprophytes.
D
Some of the organisms can fix atmospheric
nitrogen in specialized cells called sheath cells.
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Explanation: Option 2 is correct. Plasmogamy means the fusion of cytoplasm (protoplasm) of two gametes, which may be motile or non-motile. Karyogamy (not option 1) is the fusion of the nuclei. Option 3 is incorrect because saprophytes feed on dead organic matter, whereas organisms that depend on living plants are parasites. Option 4 is incorrect because nitrogen fixation in cyanobacteria occurs in specialized cells called heterocysts, not sheath cells.
🧠 Did You Know? In fungi, plasmogamy often occurs first, followed by karyogamy to form a diploid nucleus.
💡 NCERT Memory Line: Plasmogamy = fusion of cytoplasm; Karyogamy = fusion of nuclei.
Match Column-I with Column-II.
A
A-I, B-II, C-III, D-IV
B
A-II, B-III, C-IV, D-I
C
A-IV, B-II, C-I, D-III
D
A-III, B-IV, C-II, D-I
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Select the correct pair.
A
Large colorless empty cells in the epidermis of grass leaves
- Subsidiary cells
B
In dicot leaves, vascular bundles are surrounded by large thick-walled cells
- Conjunctive tissue
C
Cells of medullary rays that form part of cambial ring
- Interfascicular cambium
D
Loose parenchyma cells rupturing the epidermis and forming a lensshaped opening in bark
- Spongy parenchyma
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Match List-I with List-II.
List-I
List-II
(A)Protein
(I)C = C double bonds
(B)Unsaturated fatty acid
(II)Phosphodiester bonds
(C)Nucleic acid
(III)Glycosidic bonds
(D)Polysaccharide
(IV)Peptide bonds
Choose the correct answer from the options given below:
A
A-I, B-IV, C-III, D-II
B
A-II, B-I, C-IV, D-III
C
A-IV, B-III, C-I, D-II
D
A-IV, B-I, C-II, D-III
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Match List-I with List-II.
List-I
List-II
(A)S phase
(I)protein are synthesized
(B)G2 phase
(II)Inactive phase
(C)Quiescent stage
(III)Interval between mitosis and initiation of DNA replication
(D)G1 phase
(IV)DNA replication
Choose the correct answer from the options given below:
A
A-IV, B-II, C-III, D-I,
B
A-IV, B-I, C-II, D-III,
C
A-II, B-IV, C-III, D-I,
D
A-III, B-II, C-I, D-IV,
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