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NEET Zoology PYQs
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🧬 Zoology
📘 Class XI & XII
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407 questions in Zoology
Which of the following hormones is not secreted by the human placenta?
A
hCG
B
Estrogen
C
Progesterone
D
LH
Show explanation
The placenta secretes hCG, hPL, estrogens, progesterone and relaxin. LH is secreted by the anterior pituitary gland.
For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?
A
Father: IA i and Mother: IB i
B
Father: IA i and Mother: IA i
C
Father: IB i and Mother: IB i
D
Father: IA IB and Mother: IA i
Show explanation
A child with blood group O has genotype ii. Since the father (IA IB ) has no i allele, this combination cannot produce an O blood group child.
Given below are two statements:Assertion (A): Forelimbs of humans and bats are homologous.Reason (R): Forelimbs of humans and bats have similar anatomical structure.
A
Both A and R are correct and R is the correct explanation of A
B
Both A and R are true, but R is not the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Show explanation
Human and bat forelimbs have the same basic anatomical plan due to common ancestry. They are homologous organs that have evolved to perform different functions.
Colostrum, secreted by the mother during the initial days of lactation, is abundant in
A
IgG
B
IgM
C
IgA
D
IgD
Show explanation
Colostrum is rich in IgA antibodies that provide passive immunity to the newborn.
Given below are two statements:Assertion (A): Abingdon tortoise in Galapagos Islands became extinct within a decade after goats were introduced.Reason (R): Goats were more efficient at browsing than Abingdon tortoise.
A
Both A and R are correct and R is the correct explanation of A
B
Both A and R are correct but R is not the correct explanation of A
C
A is correct but R is not correct
D
A is not correct but R is correct
Show explanation
Introduced goats overgrazed vegetation, outcompeting the Abingdon tortoise for food and contributing to its extinction.
The covering of ovum at ovulation is
A
Endometrium
B
Zona radiata
C
Zona pellucida
D
Chorion
Show explanation
At ovulation, the secondary oocyte is surrounded by the zona pellucida and corona radiata. The principal covering is the zona pellucida.
Match List-I with List-II:
List-I List-II A. Both species are harmed I. Predation B. One species is harmed and the other is benefited II. Mutualism C. Both species are benefited III. Competition D. One is benefited while the other has no effect IV. Commensalism
A
A-III, B-IV, C-II, D-I
B
A-I, B-II, C-III, D-IV
C
A-II, B-I, C-IV, D-III
D
A-III, B-I, C-II, D-IV
Show explanation
Competition harms both species. Predation benefits one and harms the other. Mutualism benefits both species. Commensalism benefits one species while the other is unaffected.
Given below are two statements:Assertion (A): In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf.Reason (R): Stem height is a contrasting trait, with tall being dominant and dwarf being recessive.
A
Both A and R are correct and R is the correct explanation of A
B
Both A and R are correct but R is not the correct explanation of A
C
A is correct but R is not correct
D
A is not correct but R is correct
Show explanation
In Mendel's monohybrid cross, the dominant allele for tallness masks the recessive dwarf allele, so all F1 plants are tall.
Which of the following statements are correct?
A
(a), (b) and (c)
B
(a) and (b) only
C
(a) and (c) only
D
(b) and (c) only
Show explanation
Energy flow is unidirectional, the pyramid of energy is always upright, and only about 10% of energy is transferred from one trophic level to the next.
Which of the following statements is correct about Plasmodium?
A
Reproduces sexually in liver cells
B
Reproduces sexually in RBCs
C
Gametocytes develop in mosquito gut
D
Fertilization takes place in mosquito gut
Show explanation
The asexual life cycle occurs in humans, whereas fertilization and sexual reproduction occur inside the gut of the female Anopheles mosquito.
