Question Papers For Board Examinations 2024

Class – XII

Subject – Biology

• Subject :- Biology
• Class : XII
• Year : 2024

1. In which of the following plants are both male and female flowers born on the same plant and the mode of pollination can be geitonogamy or xenogamy ?
(A) Papaya
(B) Date Palm
(C) Maize
(D) Spinach

2. Which one of the following hormones is secreted by the human placenta that helps in the maintenance of pregnancy ? (A) Relaxin (B) Human Chorionic Gonadotropin(C) Oxytocin (D) Human Placental Lactogen

3. The periodic abstinence by a couple for family planning should be from :
(A) Day 5 to 10 of menstrual cycle
(B) Day 13 to 15 of menstrual cycle
(C) Day 10 to 17 of menstrual cycle
(D) Day 16 to 20 of menstrual cycle

4. Select the incorrect match from the following :
Human Karyotype Characters
(A) 45 + XX Broad palm with characteristic palm crease
(B) 44 + XXY Overall feminine development
(C) 44 + XO Sterile females as ovaries are rudimentary
(D) 44 + XY Normal male

5. You know that there are twenty different types of naturally occurring amino acids and four different types of bases in the DNA. A combination of 3 such bases code for a specific amino acid. If instead there are 96 different amino acids and 12 different bases in the DNA, then the minimum number of combination of bases required to form a codon is:
(A) 6 
(B) 8
(C) 2 
(D) 4

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Courtesy: CBSE