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NEET Biology (Oct)2020 PYQs
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89 questions in NEET (Oct)2020
Match the following:
List-I
List-II
(A)Aquaporin
(I)Amide
(B)Asparagine
(II)Polysaccharide
(C)Abscisic acid
(III)Polypeptide
(D)Chitin
(IV)Carotenoids
Select the correct option:
A
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
B
(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
C
(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
D
(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
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Attachment of spindle fibers to kinetochores of
chromosomes becomes evident in:
A
Anaphase
B
Telophase
C
Prophase
D
Metaphase
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Explanation: In mitosis, the kinetochores on chromosomes attach to spindle microtubules as the chromosomes align. This attachment becomes evident when the chromosomes align at the middle of the cell, i.e., in metaphase, with kinetochores held on by spindle fibers from opposite poles. Thus, the visible connection between kinetochores and spindle fibers is most evident during metaphase of cell division, as per NCERT description.
🧠 Did You Know? Metaphase is characterized by chromosomes lining up at the equator, with kinetochores attached to microtubules from both poles.
💡 NCERT Memory Line: “Chromosomes move to the equator and become arranged at metaphase plate; spindle fibers attach to kinetochores.”
In a mitotic cycle, the correct sequence of phases is:
A
S, G1 , G2 , M
B
G1 , S, G2 , M
C
M, G1 , G2 , S
D
G1 , G2 , S, M
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Match the following events that occur in their respective phases of cell cycle and select the correct option:
(A)G1 phase
(I)Cell grows and organelle
duplication
(B)S phase
(II)DNA replication and chromosome
duplication
(C)G2 phase
(III)Cytoplasmic growth
(D)Metaphase in M-phase
(IV)Alignment of chromosomes
A
(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
B
(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
C
(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
D
(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
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During Meiosis 1, in which stage synapsis takes place?
A
Pachytene
B
Zygotene
C
Diplotene
D
Leptotene
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Select the incorrect statement.
A
Transport of molecules in phloem can be
bidirectional.
B
Movement of minerals in xylem is unidirectional.
C
Unloading of sucrose at sink does not involve the
utilization of ATP.
D
Elements most easily mobilized in plants from one
region to another are: phosphorus, sulphur, nitrogen and potassium.
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In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:
A
Ammonia
B
Glutamate
C
Nitrates
D
Ureides
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Which of the following statements is incorrect?
A
RuBisCO is a bifunctional enzyme
B
In C4 plants, the site of RuBisCO activity is mesophyll cell
C
The substrate molecule for RuBisCO activity is a 5-carbon compound
D
RuBisCO action requires ATP and NADPH
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During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PS II, what is the source which replaces these electrons?
A
Oxygen
B
Water
C
Carbon dioxide
D
Light
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Pyruvate dehydrogenase activity during aerobic
respiration requires:
A
Calcium
B
Iron
C
Cobalt
D
Magnesium
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