Biology · CBSE

Board exam

2024Class 12Set 57/1/170 marks33 questions

18 of its 33 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.

Sit this paper against the clock, marked by its official answers, or get a new paper like it. Sign in first; practising is part of Pro.

Source: CBSE Board Examination 2024, Class 12 Biology (044), paper 57/1/1, published by CBSE. CBSE's ZIP of every set

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18 questions

Q1Section A1 mark
$In which of the following plants are both male and female flowers born on the same plant and the mode of pollination can be geitonogamy or xenogamy ?$
1. A $Papaya$
2. B $Date Palm$
3. C $Maize$
4. D $Spinach$
Q2Section A1 mark
$Which one of the following hormones is secreted by the human placenta that helps in the maintenance of pregnancy ?$
1. A $Relaxin$
2. B $Human Chorionic Gonadotropin$
3. C $Oxytocin$
4. D $Human Placental Lactogen$
Q3Section A1 mark
$The periodic abstinence by a couple for family planning should be from :$
1. A $Day 5 to 10 of menstrual cycle$
2. B $Day 13 to 15 of menstrual cycle$
3. C $Day 10 to 17 of menstrual cycle$
4. D $Day 16 to 20 of menstrual cycle$
Q4Section A1 mark
$Select the incorrect match from the following :$
1. A $45 + XX — Broad palm with characteristic palm crease$
2. B $44 + XXY — Overall feminine development$
3. C $44 + XO — Sterile females as ovaries are rudimentary$
4. D $44 + XY — Normal male$
Q5Section A1 mark
$You know that there are twenty different types of naturally occurring amino acids and four different types of bases in the DNA. A combination of 3 such bases code for a specific amino acid. If instead there are 96 different amino acids and 12 different bases in the DNA, then the minimum number of combination of bases required to form a codon is :$
1. A $6$
2. B $8$
3. C $2$
4. D $4$
Q7Section A1 mark
$In which of the following conditions/diseases is there a substantial increase in the activity of mast cells observed in the human body ?$
1. A $Typhoid$
2. B $Allergy$
3. C $Ascariasis$
4. D $AIDS$
Q8Section A1 mark
$Lactobacillus that sets milk into curd is categorised as :$
1. A $Cyanobacteria$
2. B $Archaebacteria$
3. C $Chemosynthetic bacteria$
4. D $Heterotrophic bacteria$
Q9Section A1 mark
$Which one of the following transgenic animals is being used to test the safety of the polio vaccine ?$
1. A $Sheep$
2. B $Goat$
3. C $Pig$
4. D $Mice$

Board exam

2024Class 12Set 57/1/170 marks33 questions

18 of its 33 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.

Sit this paper against the clock, marked by its official answers, or get a new paper like it. Sign in first; practising is part of Pro.

Source: CBSE Board Examination 2024, Class 12 Biology (044), paper 57/1/1, published by CBSE. CBSE's ZIP of every set