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NEET Biology RE-NEET 2026 PYQs
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90 questions in RE-NEET 2026
How many theca are present in each lobe of a typical bilobed angiosperm anther?
A
2
B
6
C
8
D
12
Show explanation
A typical angiosperm anther is bilobed, and each lobe contains two theca (dithecous anther).
Muscle contraction is initiated by a signal sent by the central nervous system by the release of _______.
A
Acetyl choline
B
Acetyl coenzyme A
C
Cyclic guanine monophosphate
D
Cyclic adenine monophosphate
Show explanation
Acetylcholine is released at the neuromuscular junction and initiates muscle contraction.
Which of the following statements about lac-operon is correct?
A
Gene i is constitutively expressed
B
Lactose activates repressor to bind to the operator
C
Genes i, z, y and a share single common promoter
D
Galactose can act as an inducer of lac operon
Show explanation
The regulatory gene (i) is constitutively expressed. Allolactose, not galactose, acts as the inducer by inactivating the repressor.
Which of the following in the female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the egg?
A
Antipodals
B
Synergids
C
Central cell
D
Polar nucleus
Show explanation
Synergids possess a filiform apparatus that guides the pollen tube towards the egg apparatus.
Which of the following plants produces non-albuminous seeds?
A
Wheat
B
Maize
C
Barley
D
Pea
Show explanation
Pea produces non-albuminous (exalbuminous) seeds because the endosperm is consumed during embryo development.
If the diploid chromosome number of a typical angiosperm is 36, what would be the chromosome number in its endosperm?
A
18
B
36
C
54
D
72
Show explanation
The endosperm is triploid (3n). If the diploid chromosome number is 36 (2n), then n = 18 and the endosperm chromosome number is 3n = 54.
Which of the following statements about the reabsorption process in Henle's loop are correct?+ and water takes place in Henle's loop.
A
(a) and (b) only
B
(b), (c) and (d) only
C
(a), (b) and (c) only
D
(a), (b) and (d) only
Show explanation
The descending limb reabsorbs water, whereas the ascending limb reabsorbs electrolytes and is impermeable to water. The filtrate becomes concentrated in the descending limb.
Which of the following is the correct order of arrangement of vertebral column from head to toe?
A
Cervical vertebra, thoracic vertebra, sacrum, lumbar vertebra
B
Sacrum, lumbar vertebra, thoracic vertebra, cervical vertebra
C
Cervical vertebra, lumbar vertebra, thoracic vertebra, sacrum
D
Cervical vertebra, thoracic vertebra, lumbar vertebra, sacrum
Show explanation
The vertebral column is arranged from top to bottom as cervical, thoracic, lumbar, sacral and coccygeal vertebrae.
Which of the following is not evidence for evolution?
A
Convergent evolution of traits like wings of birds and butterflies
B
Paleontological evidence from fossil records
C
Embryological support for evolution as proposed by Ernst Heckel
D
Divergent evolution of anatomical structures such as forelimbs
Show explanation
Haeckel's biogenetic law has been discredited and is no longer accepted as valid evidence for evolution.
Given below are two statements:Statement I: Modern Homo sapiens arose in Australia and moved across continents.Statement II: Homo sapiens arose around 75000 to 10000 years ago.
A
Both Statement I and Statement II are correct
B
Both Statement I and Statement II are incorrect
C
Statement I is correct but Statement II is incorrect
D
Statement I is incorrect but Statement II is incorrect
Show explanation
Modern Homo sapiens originated in Africa. NCERT states that Homo sapiens arose in Africa about 2 lakh years ago and later spread to other continents.
