CBSE Class 12 Biology 2023 question paper (57/3)

1. A.
   Homozygous sex chromosomes (ZZ) determine female sex in birds
2. B.
   XO type of sex chromosomes determine male sex in grasshoppers
3. C.
   XXY condition in humans, as found in Turner Syndrome, determines male sex
4. D.
   Homozygous sex chromosomes (XX) produce male sex in Drosophila

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1. A.
   (ii) $\rightarrow$ (iv) $\rightarrow$ (iii) $\rightarrow$ (i) $\rightarrow$ (v)
2. B.
   (i) $\rightarrow$ (ii) $\rightarrow$ (v) $\rightarrow$ (iv) $\rightarrow$ (iii)
3. C.
   (iii) $\rightarrow$ (iv) $\rightarrow$ (i) $\rightarrow$ (ii) $\rightarrow$ (v)
4. D.
   (iv) $\rightarrow$ (iii) $\rightarrow$ (ii) $\rightarrow$ (v) $\rightarrow$ (i)

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1. A.
   Convergent Evolution
2. B.
   Disruptive Selection
3. C.
   Divergent Evolution
4. D.
   Homologous Ancestry

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1. A.
   Point S
2. B.
   Point R
3. C.
   Point Q
4. D.
   Point P

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1. A.
   P-i, Q-iii, R-ii, S-iv
2. B.
   P-i, Q-iv, R-iii, S-ii
3. C.
   P-iii, Q-iv, R-i, S-ii
4. D.
   P-ii, Q-iii, R-i, S-iv

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1. A.
   Phoenix dactylifera
2. B.
   Striga asiatica
3. C.
   Mangifera indica
4. D.
   Yucca gigantea

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1. A.
   (i) and (iv) only
2. B.
   (iii) only
3. C.
   (iv) only
4. D.
   (iii) and (iv) only

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1. A.
   (ii), (iii) and (iv) only
2. B.
   (ii) and (iv) only
3. C.
   (i) and (iii) only
4. D.
   (i), (ii) and (iii) only

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1. A.
   Head lice in humans
2. B.
   Cuscuta on a mango tree
3. C.
   Female Anopheles
4. D.
   Ticks on dogs

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1. A.
   Saccharomyces cerevisiae
2. B.
   Propionibacterium sharmanii
3. C.
   Monascus purpureus
4. D.
   Penicillium notatum

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1. A.
   (i) and (iii) only
2. B.
   (ii) and (iii) only
3. C.
   (ii) only
4. D.
   (i) only

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1. A.
   Individual 1 and 3
2. B.
   Individual 1 and 2
3. C.
   Individual 2 and 3
4. D.
   Individual 1 is the only parent of the child amongst 1, 2 and 3

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   (ii) $\rightarrow$ (iv) $\rightarrow$ (iii) $\rightarrow$ (i) $\rightarrow$ (v)
2. B.
   (i) $\rightarrow$ (ii) $\rightarrow$ (v) $\rightarrow$ (iv) $\rightarrow$ (iii)
3. C.
   (iii) $\rightarrow$ (iv) $\rightarrow$ (i) $\rightarrow$ (ii) $\rightarrow$ (v)
4. D.
   (iv) $\rightarrow$ (iii) $\rightarrow$ (ii) $\rightarrow$ (v) $\rightarrow$ (i)

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1. A.
   (i) and (iii) only
2. B.
   (ii) and (iii) only
3. C.
   (iii) and (iv) only
4. D.
   (ii) and (iv) only

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1. A.
   Convergent Evolution
2. B.
   Disruptive Selection
3. C.
   Divergent Evolution
4. D.
   Homologous Ancestry

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1. A.
   P-i, Q-ii, R-iii, S-ii
2. B.
   P-ii, Q-iii, R-iv, S-i
3. C.
   P-iii, Q-i, R-i, S-iii
4. D.
   P-iv, Q-i, R-ii, S-iv

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1. A.
   Point S
2. B.
   Point R
3. C.
   Point Q
4. D.
   Point P

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1. A.
   FSH and LH
2. B.
   LH and Estrogen
3. C.
   FSH and Estrogen
4. D.
   Estrogen and Progesterone

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1. A.
   Oscillatoria
2. B.
   Rhizobium
3. C.
   Anabaena
4. D.
   Nostoc

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1. A.
   (i) and (iii) only
2. B.
   (ii) and (iii) only
3. C.
   (ii) only
4. D.
   (i) only

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1. A.
   Individual 1 and 3
2. B.
   Individual 1 and 2
3. C.
   Individual 2 and 3
4. D.
   Individual 1 is the only parent of the child amongst 1, 2 and 3

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1. A.
   (i) and (iv) only
2. B.
   (iii) only
3. C.
   (iv) only
4. D.
   (iii) and (iv) only

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1. A.
   Grass $\rightarrow$ Goat $\rightarrow$ Fox $\rightarrow$ Tiger
2. B.
   Mice $\rightarrow$ Cat $\rightarrow$ Hyena $\rightarrow$ Cheetah
3. C.
   Grass $\rightarrow$ Rabbit $\rightarrow$ Fox $\rightarrow$ Flea
4. D.
   Grass $\rightarrow$ Insects $\rightarrow$ Sparrow $\rightarrow$ Snake

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1. A.
   (ii), (iii) and (iv) only
2. B.
   (ii) and (iv) only
3. C.
   (i) and (iii) only
4. D.
   (i), (ii) and (iii) only

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Point S
2. B.
   Point R
3. C.
   Point Q
4. D.
   Point P

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1. A.
   Perisperm
2. B.
   Thalamus
3. C.
   Sepals
4. D.
   Peduncle

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1. A.
   Most fertile days: 14 – 21; Least fertile days: 1 – 7
2. B.
   Most fertile days: 10 – 17; Least fertile days: 21 – 28
3. C.
   Most fertile days: 1 – 7; Least fertile days: 14 – 21
4. D.
   Most fertile days: 21 – 28; Least fertile days: 7 – 14

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1. A.
   Ferns
2. B.
   Horsetails
3. C.
   Ginkgos
4. D.
   Bryophytes

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1. A.
   $\text{P}^{32}$
2. B.
   $\text{S}^{32}$
3. C.
   $\text{S}^{35}$
4. D.
   $\text{P}^{35}$

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1. A.
   Individual 1 and 3
2. B.
   Individual 1 and 2
3. C.
   Individual 2 and 3
4. D.
   Individual 1 is the only parent of the child amongst 1, 2 and 3

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1. A.
   (i) and (iii) only
2. B.
   (ii) and (iii) only
3. C.
   (ii) only
4. D.
   (i) only

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1. A.
   Saccharomyces cerevisiae
2. B.
   Propionibacterium sharmanii
3. C.
   Monascus purpureus
4. D.
   Penicillium notatum

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1. A.
   (i) and (iv) only
2. B.
   (iii) only
3. C.
   (iv) only
4. D.
   (iii) and (iv) only

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1. A.
   The Indo-Burma Region
2. B.
   Jaintia Hills in Meghalaya
3. C.
   The Western Ghats and Sri Lanka
4. D.
   The Himalayas

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1. A.
   (ii), (iii) and (iv) only
2. B.
   (ii) and (iv) only
3. C.
   (i) and (iii) only
4. D.
   (i), (ii) and (iii) only

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1. A.
   Convergent Evolution
2. B.
   Disruptive Selection
3. C.
   Divergent Evolution
4. D.
   Homologous Ancestry

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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