Organisation : Board of School Education Haryana (BSEH)
Exam : Senior Secondary Exam (Class 12th)
Document Type : Question Paper
Subject : Biology
Year : March 2025
Website : https://bseh.org.in/srsec-old-question-paper-march-2025
BSEH Haryana Class 12th Biology Question Paper
Download Board of School Education Haryana (BSEH) Senior Secondary Exam (Class 12th) March 2025 Biology Question Paper.
BSEH Haryana Class 12th Biology Questions
Section-A: (Objective Type Questions)
1. What is the ploidy of endosperm in flowering plants ?
(A) 2n
(B) 3n
(C) 4n
(D) 6n
2. What happens to the BOD of a water body with removal of effluents from it ?
(A) Increases
(B) Decreases
(C) Remains the same
(D) Increases and then stagnates
3. The distance between the two strands of a DNA molecule ………… from one end to another.
(A) increases
(B) remains the same
(C) decreases
(D) none of these
4. The black walnut plant secretes juglone, a chemical substance that destroys other plants like pepper growing within its root zone. What type of population interaction does it denote ?
(A) Predation
(B) Competition
(C) Mutualism
(D) Amensalism
5. Ginkgo biloba is known as a living fossil as it has changed very little over time. It is resistant to disease and pests, is tolerant of a wide range of environmental conditions and is the last standing member of its botanical family. It is the example of which of the following phenomena ?
(A) Speciation
(B) Fossilization
(C) Adaptive radiation
(D) Survival of the fittest
6. The cause of sickle cell anemia is :
(A) Point mutation
(B) Natural selection
(C) Adaptive radiation
(D) Both (B) and (C)
7. Industrial production of which of these products can be negatively affected by the presence of Saccharomyces cerevisiae ?
(A) beer
(B) wine
(C) fruit juice
(D) wheat bread
8. An individual infected with a fungal disease shows dry scaly Lesions on various body parts. Which of the following disease it may be ?
(A) Ringworm
(B) Filariasis
(C) Amoebiasis
(D) Ascariasis
9. A carbon sink is any environment that can store carbon and remove it from the atmosphere ? Which of the following will lead to a decline in carbon sink ?
(A) Deforestation
(B) Population growth
(C) Burning of fossil fuels
(D) Increase in industrial activity
10. What kind of charge is present on DNA molecule ?
11. In PCR reaction at Step-2, denaturation of DNA takes place. Name the factor responsible for it.
12. Brominated Flame Retadants (BFR’s) are chemicals that are released into water bodies by some industries and enter into various food chains. One of the food chain is as follows : Phytoplanktons → Zooplanktons → Herring → Mackerel → Humans. At what organism level in this food chain the concentration of BFR’s will be highest ?
13. …………. are called molecular scissors.
14. Energy is always highest at the first trophic level and reduces as we move up the …………. .
15. The non-coding sequences are called …………. .
The question nos. 16, 17 & 18 given below consists of two statements each :
Assertion (A) and Reason (R). Answer the questions by selecting the appropriate option given below :
16. Assertion (A) : Deoxyribonucleic Acid (DNA) and Ribonucleic Acid (RNA) are the two types of nucleic acids found in living systems.
Reason (R) : RNA acts as the genetic material in most of the organisms.
Options :
(A) Assertion (A) and Reason (R) both are true and Reason (R) is the correct explanation of Assertion (A).
(B) Assertion (A) and Reason (R) both are true, but Reason (R) is not the correct explanation of Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) and Reason (R) both are false.
17. Assertion (A) : Health does not simply mean ‘absence of disease’ or ‘physical fitness’.
Reason (R) : Health is defined as a state of complete physical, mental and social well-being.
Options :
(A) Assertion (A) and Reason (R) both are true and Reason (R) is the correct explanation of Assertion (A).
(B) Assertion (A) and Reason (R) both are true, but Reason (R) is not the correct explanation of Assertion (A).
(C) Assertion (A) are true, but Reason (R) is false.
(D) Assertion (A) and Reason (R) both are false.
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