📚
NEET Biology (Sept)2020 PYQs
Previous Year Questions
•
NCERT Based
•
Instant Feedback
📝 NEET (Sept)2020
📘 NCERT Focused
🤖 AI Explanations
This page score:
0 /40
90 questions in NEET (Sept)2020
Identify the correct statement with regard to
G1 phase (Gap 1) of interphase.
A
DNA synthesis or replication takes place.
B
Reorganisation of all cell components takes place.
C
Cell is metabolically active, grows but does not replicate its DNA.
D
Nuclear Division takes place.
Show explanation
Explanation will be generated when opened.
Dissolution of the synaptonemal complex occurs
during:
A
Pachytene
B
Zygotene
C
Diplotene
D
Leptotene
Show explanation
Explanation will be generated when opened.
Match the following with respect to meiosis :
(A)Zygotene
(I)Terminalization
(B)Pachytene
(II)Chiasmata
(C)Diplotene
(III)Crossing over
(D)Diakinesis
(IV)Synapsis
Select the correct option from the following :
A
(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
B
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
C
(A)-(I), (B)-(II), (C)-(IV), (D)-(III)
D
(A)-(II), (B)-(IV), (C)-(III), (D)-(I)
Show explanation
Explanation will be generated when opened.
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is:
A
Transpiration
B
Root pressure
C
Imbibition
D
Plasmolysis
Show explanation
Explanation will be generated when opened.
Match the following concerning essential elements
and their functions in plants:
(A)Iron
(I)Photolysis of water
(B)Zinc
(II)Pollen germination
(C)Boron
(III)Required for chlorophyll biosynthesis
(D)Manganese
(IV)IAA biosynthesis
Select the correct option:
A
(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
B
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
C
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
D
(A)-(IV), (B)-(I), (C)-(II), (III)
Show explanation
Explanation will be generated when opened.
The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are:
A
Ammonia alone
B
Nitrate alone
C
Ammonia and oxygen
D
Ammonia and hydrogen
Show explanation
Explanation will be generated when opened.
In light reaction, plastoquinone facilitates the
transfer of electrons from:
A
PS-II to Cytb6 f complex
B
Cytb6 f complex to PS-I
C
PS-I to NADP+
D
PS-I to ATP synthase
Show explanation
Explanation will be generated when opened.
The oxygenation activity of RuBisCo enzyme in
photorespiration leads to the formation of:
A
2 molecules of 3-C compound
B
1 molecule of 3-C compound
C
1 molecule of 6-C compound
D
1 molecule of 4-C compound and 1 molecule of 2-C compound
Show explanation
Explanation will be generated when opened.
The number of substrate level phosphorylations
in one turn of citric acid cycle is:
A
Zero
B
One
C
Two
D
Three
Show explanation
Explanation: In one turn of the citric acid cycle, substrate-level phosphorylation occurs once. Succinyl-CoA synthetase converts succinyl-CoA to succinate and produces one GTP (or ATP, depending on the organism). Thus, the number of substrate-level phosphorylations per cycle is one. Options Zero, Two, or Three do not match this NCERT-stated observation.
🧠 Did You Know? Only one molecule of GTP/ATP is formed per cycle by substrate-level phosphorylation; the rest of the cycle’s energy is captured in NADH and FADH2 during redox reactions.
💡 NCERT Memory Line: In one turn of the TCA cycle, one substrate-level phosphorylation yields one GTP (ATP) molecule.
Which of the following is not an inhibitory
substance governing seed dormancy?
A
Gibberellic acid
B
Abscisic acid
C
Phenolic acid
D
Para-ascorbic acid
Show explanation
Explanation will be generated when opened.
