HBSE Class 12th Biology Solved Question Paper 2021
HBSE Class 12 Biology Previous Year Question Paper with Answer. HBSE Board Solved Question Paper Class 12 Biology 2021. HBSE 12th Question Paper Download 2021. HBSE Class 12 Biology Paper Solution 2021. Haryana Board Class 12th Biology Question Paper 2021 Pdf Download with Answer.
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Q1. Define Genotype.
Ans. The set of genes in our DNA responsible for a particular trait is known as genotype.
Q2. In which of the following polyembryony is found ?
Ans. (B) Orange
Q3. Which of the following is sexually transmitted disease ?
(D) All of these
Ans. (D) All of these
Q4. Which of the following taxa have maximum species diversity ?
Ans. (A) Fishes
Q5. The interaction between cattle egret and grazing cattle is an example of :
Ans. (C) Commensalism
Q6. In which syndrome a person has 47 chromosomes ?
(C) both (A) and (B)
Ans. (B) Klinefelter’s
Q7. Which is a initiator Codon ?
Ans. (C) AUG
Q8. What is Barr Body ?
Ans. A Barr body is an inactive X chromosome in a cell with more than one X chromosome.
Q9. Which antibodies are abundant in colostrum ?
Ans. (A) IgA
Q10. Which RNA is called adaptor molecule ?
(D) All of these
Ans. (C) tRNA
Q11. When proinsulin changes into insulin which extra peptide is removed :
(D) None of these
Ans. (C) C
Q12. What is Coleoptile ?
Ans. Coleoptile are cylindrical organs that ensheath the first leaf and shoot apex in grass seedings.
Q13. Write full form of “Ori”.
Ans. Origin of Replication
Q14. What is insertional inactivation.
Ans. insertional inactivation is a technique used in recombinant DNA engineering where a plasmid is used to disable expression of a gene.
Q15. Name the enzyme used to breakdown cell wall of plant cell.
Q16. What are cytokine barriers ?
Ans. Cytokine barriers are a form of innate immunity that plays an important role in preventing viral replication and responds to many types of antigens and not just one specific.
Q17. Name the diagnostic test for AIDS.
Ans. ELISA Test ( Enzyme Linked Immunosorbent Assay)
Q18. Define Disease.
Ans. A disease or medical condition is an unhealthy state where something bad happens to the body or mind.
Q19. What are sacred groves ?
Ans. The sacred groves are the trees which are considered as socially, culturally, medicinally or religiously important. Ex – Ficus Religious (Peepal) tree.
Q20. What are stenothermal organisms ?
Ans. The organisms which can tolerate only a narrow range of temperature are called stenothermal organisms. Ex – fishes, corals, snail etc.
Q21. Define reproductive health according to W.H.O.
Ans. Reproductive health is a state of complete physical, mental and social well-being and not merely the absense of disease or infirmity in all matters relating to the reproductive system and to its functions and processes.
Q22. Write down full form of P.C.R.
Ans. Polymerase Chain Reaction
Q23. Which flower is a good example to study inheritance of flower colour in incomplete dominance ?
Ans. Antirrhinum (dog flower)
Q24. What is passive immunity ?
Ans. Passive immunity is the transfer of active humoral immunity of ready-made antibodies.
Q25. What is mutagen ?
Ans. Mutagens are the agents that damage our genetic material, usually DNA and results in genetic abnormalities – either inherited or non-inheritrd.
Q26. What is Capping ?
Ans. It a characteristic of mRNA
Q27. Which microbe is used for commercial production of citric acid ?
Ans. Aspergillus Niger
Q28. Name the bacteria which can fix atmospheric nitrogen while free living in the soil.
Q29. Alexander Fleming was working on which bacteria when he discovered Penicillin ?
Ans. Staphylococci aureus bacteria later identified as Penicillium notatum.
Q30. What is flocs ?
Ans. A lossely clumped mass of fine particles.
Q31. What is Palindrome in DNA ?
Ans. A Palindrome sequence is a sequence made up of nucleic acids within double helix of DNA or RNA that is the same when read from 5′ to 3′ on one strand and 5′ to 3′ on the other complementary strand.
Q32. Name the scientific name of fruit fly.
Ans. Drosophila melanogaster
Q33. The polypeptide chains of insulin are linked by which bonds ?
Ans. Disulfide bonds
Q34. ELISA is based on which principle ?
Ans. ELISA is based on the principle of antigen – antibody interaction.
Q35. What is Gene Therapy ?
Ans. Gene Therapy is a medical field which focuses on the utilization of the therapeutic delivery of nucleic acids into a patient’s cells as a drug to treat disease .