SAMPLE QUESTION PAPER (TERM I)
2021-22
CLASS XII (CBSE)
BIOLOGY
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SECTION – A Section – A consists of 24 questions. Attempt any 20 questions from this section. The first attempted 20 questions would be evaluated. |
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| 1 | The structure of bilobed anther consists of
A. 2 thecae, 2 sporangia B. 4 thecae, 4 sporangia C. 4 thecae, 2 sporangia D. 2 thecae, 4 sporangia |
| 2 | The coconut water from tender coconut is
A. cellular endosperm. B. free nuclear endosperm. C. both cellular and nuclear endosperm. D. free nuclear embryo. |
| 3 | Pollen grains are well preserved as fossils because of presence of
A. sporopollenin B. cellulose C. lignocellulose D. pectocellulose |
| 4 | Which of the following statements are correct with respect to hormones secreted by placenta?
(i) Placenta secretes relaxin during later stage of pregnancy. (ii) Placenta secretes high amount of FSH during pregnancy. (iii) Placenta secretes relaxin during initial stage of pregnancy. (iv) Placenta secretes hCG and hPL during pregnancy. A. (i) and (iv) B. (i), (ii) and (iv) C. (iii) and (iv) D. (ii), (iii) and (iv) |
| 5 | Penetration of the sperm in the ovum is followed by
A. formation of first polar body. B. completion of meiosis II. C. first meiosis. D. dissolution of zona pellucida. |
| 6 | The correct sequence of hormone secretion from beginning of menstruation is
A. FSH, progesterone, estrogen. B. estrogen, FSH, progesterone. C. FSH, estrogen, progesterone. D. estrogen, progesterone, FSH. |
| 7 | The thalamus contributes to the fruit formation in
A. banana. B. orange. C. strawberry. D. guava. |
| 8 | How many types of gametes would be produced if the genotype of a parent is AaBB?
A. 1 B. 2 C. 3 D. 4 |
| 9 | Which of the following statements indicates parallelism in genes and chromosomes?
(i) They occur in pairs (ii) They segregate during gamete formation (iii) They show linkage (iv) Independent pairs segregate independently A. (i) and (iii) B. (ii) and (iii) C. (i), (ii) and (iii) D. (i), (ii) and (iv) |
| 10 | Which of the following amino acid substitution is responsible for causing sickle cell anemia?
A. Valine is substituted by Glutamic acid in the α globin chain at the sixth position B. Valine is substituted by Glutamic acid in the β globin chain at seventh position C. Glutamic acid is substituted by Valine in the α globin chain at the sixth position D. Glutamic acid is substituted by Valine in the β globin chain at the sixth position |
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BIOLOGY-SQP 12TH STD CBSE 21-22
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