Are you looking for the Class12th biology Questions Paper 2023 PDF Download You’re in the right place. In this post, we’ve provided a complete set of important questions and their answers from the 2023 Biology exam conducted by the Bihar School Examination Board (BSEB). These questions are extremely helpful for students preparing for upcoming board exams, giving them a clear understanding of the question pattern and key topics. Go through the list below to strengthen your preparation.
Class12th biology Questions Paper 2023 PDF Download
1. Which one is a haploid structure in the following?
(A) Zygote
(B) Ovum
(C) Gamete
(D) Both (B) and (C)
Answer: Both (B) and (C)
2. Which one is an endangered species in the following?
(A) Nepenthes
(B) Tecoma
(C) Ixora
(D) Both (B) and (C)
Answer: Nepenthes
3. Analogous structures are as a result of?
(A) Shared ancestry
(C) Stabilizing selection
(B) Convergent evolution
(D) Divergent evolution
Answer: Convergent evolution
4. Cranial capacity of Java Apeman was
(A) 900 c.c.
(B) 1975 с.с.
(C) 1450 с.с.
(D) 1660 c.c.
Answer: 900 c.c.
5. Allelopathy is due to the secretion of?
(A) Nectar
(B) Vitamins
(C) Toxin
(D) Pheromone
Answer: Toxin
6. What is the ploidy level of chromosomes in the endosperm of angiospermic par
(A) п
(B) 3n
(C) 2л
(D) Both (A) and (B)
Answer: 3n
7. how many chromosomes are there in human gametes?
(A) 21
(B) 44
(C) 23
(D) 46
Answer: 23
8. Cyanobacteria are useful biofertilizers in the field of
(A) Wheat
(B) Maize
(C) Rice
(D) Sugarcane
Answer: Rice
9. Copper-T prevents from?
(A) Egg maturation
(B) Ovulation
(C) Fertilization
(D) Both (A) and (C)
Answer: Fertilization
10. Retrovirus is a causal organism of which of the following diseases?
(A) Filaria
(B) Syphilis
(C) AIDS
(D) Both (A) and (C)
Answer: AIDS
11. An example of ex-situ conservation is
(A) Seed bank
(B) National park
(C) Sacred groves
(D) Zoological park
Answer: Seed bank
12. Graafian follicle is found in
(A) Testes of human male
(B) Liver of human being
(C) Ovaries of plants
(D) Ovaries of human female
Answer: Ovaries of human female
13. In submerged plants, the stomata lie on
(A) Equally on both furfaces
(B) Upper surface
(C) Not on any surface
(D) Lower surface
Answer: Not on any surface
14. Somaclonal variations are obtained through?
(A) Tissue culture
(B) Gamma rays
(C) Amphimixis
(D) Chemical mutagen
Answer: Tissue culture
15. The queen honeybee arises from a fertilized egg and its larve feeds on
(A) Honey
(B) Pollen
(C) Royal jelly
(D) Microbes
Answer: Royal jelly
16. Fowl pox is caused by
(A) Bacteria
(B) Ectoparasites
(C) Virus
(D) Endoparasites
Answer: Virus
17. Autopolyploidy can be induced artificially by
(A) Colchine
(B) Chloroform
(C) Colchicine
(D) Chloroquine
Answer: Colchicine
18. Food poisoning is caused by
(A) Rhizobium
(B) Azotobacter
(C) Lactobacillus
(D) Clostridium
Answer: Clostridium
19. The antibodies in the blood are secreted by
(A) Monocytes
(B) Neutrophils
(C) Lymphocytes
(D) Basophils
Answer:Lymphocytes
20. Which one is the problematic aquatic weed in the following?
(A) Eichhornia
(B) Trapa
(C) Azolla
(D) Wolffia
Answer: Eichhornia
21. What is droplet infection?
(A) Syphilis
(B) Tetanus
(C) Typhoid
(D) Pneumonia
Answer: Pneumonia
22. Restriction enzyme Eco RI cleaves DNA at which sequence?
(A)-GTATATC-
(B)-AAGCTT-
(C)-AAGTTC-
(D)-GAATTC-
Answer: -GAATTC-
23. Orthotroppus ovule is found in which of the following?
(A) Polygonum
(B) Pisum sativum
(C) Solanum nigrum
(D) Helianthus annuus
Answer: Polygonum
24. Movement of sperm is done by
(A) Acrosome.
(B) Middle piece
(C) Head
(D) Tail
Answer:Tail
25. Stomata and roots are lacking in which of the following?
(A) Dracaena
(B) Hydrilla
(C) Marsilea
(D) Eichhornia
Answer: Hydrilla
26. What will happen when fertilizer is added to freshwater pond?
(A) Increase in aquatic animals
(B) Decrease in fish population
(C) Death of hydrophytic plants
(D) Eutrophication
Answer: Eutrophication
27. A disease caused by an autosomal primary non-disjunction is
(A) Sickle cell anaemia
(B) Klinefelter’s syndrome
(C) Turner’s syndrome
(D) Down’s syndrome
Answer: Down’s syndrome
28. What is dihybrid test cross ratio?
(A) 1:1
(B) 7:1:1:7
(C) 1:1:1:1
(D) 1:7:7:1
Answer: 1:1:1:1
29. High amount of E. coli in water is an indicator of
(A) Sewage pollution
(B) Hardness of water
(C) Industrial pollution
(D) Presence of chlorine in water
Answer: Sewage pollution
30. Which is always present in photochemical smog?
(A) CO2
(B) 03
(C) SO2
(D) CH4
Answer: CH4
31. Sanitary landfill was adopted as the substitute for?
(A) Open-burning dumps
(B) Eutrophication
(C) Sewage
(D) Biomagnification
Answer: Open-burning dumps
32. Reagent used in ELISA test is
(A) Polymerase
(B) Peroxidase
(C) Ligase
(D) Endonuclease
Answer: Peroxidase
33. A tumour inducing plasmid widely used in the production of transgenic plants is that of
(A) Bacillus thuringiensis
(B) Agrobacterium tumefaciens
(C) Staphylococcus aureus
(D) E. coli
Answer: Agrobacterium tumefaciens
34. Which one in the following is a systematic insecticide?
(A) Endrin
(B) Furadan
(C) Malathion
(D) Parathion
Answer: Furadan
35. The enzyme that converts glucose into alcohol is
(A) Invertase
(B) Lipase
(C) Zymase
(D) Diastase
Answer: Zymase
36 . BOD of waste water is estimated by measuring the amount of
(A) Oxygen consumption
(B) Oxygen evolution
(C) Biodegradable organic matter
(D) Total organic matter
Answer: Oxygen consumption
37. Memory cells are formed from
(A) Monocytes
(B) Lymphocytes
(C) Eosinophils
(D) Neutrophils
Answer: Lymphocytes
Class12th biology Questions Paper 2023 PDF Download
We hope this with answers helps you in your preparation Class12th biology Questions Paper 2023 PDF Download. If you’re a student appearing for the Bihar Board Inter Exam. These objective-type questions form a major part of the Biology paper and can help you secure high marks easily.
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