HBSE Class 12th Biology Solved Question Paper 2019

HBSE Class 12th Biology Solved Question Paper 2019

HBSE Class 12 Biology Previous Year Question Paper with Answer. HBSE Board Solved Question Paper Class 12 Biology 2019. HBSE 12th Question Paper Download 2019. HBSE Class 12 Biology Paper Solution 2019. Haryana Board Class 12th Biology Question Paper 2019 Pdf Download with Answer. 


Q1. How many pairs of autosomal chromosomes are present in human ? 

(A) 44 

(B) 46 

(C) 22 

(D) 23 

Ans. (C) 22 

Q2. Coelacanth was a : 

(A) Invertebrate 

(B) Fish 

(C) Amphibian 

(D) Reptile 

Ans. (B) Fish 

Q3. A double stranded DNA has 20% cytosine. What will be the percentage of thiamine in it ? 

(A) 20% 

(B) 40% 

(C) 30% 

(D) 10% 

Ans. (C) 30% 

Q4. How many genes are present in human ‘Y’ chromosome ? 

(A) 231 

(B) 456 

(C) 196 

(D) 192 

Ans. (A) 231 

Q5. Which is a primary lymphoid organ ? 

(A) Spleen 

(B) Lymph node 

(C) Peyer’s patch 

(D) None of these  

Ans. (D) None of these  

Q6. Name the nematode which infects the roots of tobacco plant. 

Ans. Meloidegyne incognitia 

Q7. Name the scientist who coined the term ‘linkage’. 

Ans. Morgan

Q8. Where was the World Summit of Sustainable Development held in 2002 ? 

Ans. Johannesburg in South Africa

Q9. What is Apocarpous and Syncarpous ? 

Ans. Apocarpous– When more than one pistil & free

Syncarpous– When more than one pistil & fused together

Q10. What is Xenogamy ? 

Ans. Transfer of pollen grains from anther to the stigma of a different plant. 

Q11. Which is the most common species of honeybee ? 

Ans. Apis indica

Q12. Name the plant from which Cocaine is obtained. 

Ans. Erythroxylum Coca 

Q13. Name causative organism of Pneumonia. 

Ans. Streptococcus pneumonia 

Q14. Write the full form of MOET. 

Ans. Multiple Ovulation Embryo transfer Technology 


Q1. Which of the following syndrome is an example of polyploidy ? 

(A) Down 

(B) Klinefelter 

(C) Turner  

(D) None of these  

Ans. (D) None of these  

Q2. Which fish like reptile evolved probably 200 mya ? 

(A) Tyrannosaurus 

(B) Ichthyosaurs 

(C) Pelycosaurs 

(D) None of these  

Ans. (B) Ichthyosaurs 

Q3. Which of the following amino acid has only single genetic code ? 

(A) Glutamine 

(B) Tryptophan 

(C) Asparagine 

(D) Isoleucine 

Ans. (B) Tryptophan 

Q4. mRNA is transcribed by : 

(A) RNA polymerase I 

(B) RNA polymerase II 

(C) RNA polymerase III 

(D) DNA polymerase 

Ans. (B) RNA polymerase II 

Q5. Which of the following is a non-infectious disease ? 

(A) Cancer 


(C) Both (A) & (B) 

(D) Ringworm 

Ans. (A) Cancer 

Q6. Name the scientists who gave chromosomal theory of inheritance. 

Ans. Sutton and Boveri 

Q7. In which year the Earth Summit was held in Rio-de-Janeiro ? 

Ans. 1992 

Q8. What is perisperm ? In which seeds it is present ? 

Ans. Remnants of nucellus i.e. residual persistent nucellus is called perisperm. ex : Black Papper and Beet 

Q9. What is ‘Biopiracy’ ? 

Ans. Use of bio-resources by multinational companies & other organizations without proper authorization from the countries & people concerned without compensatory payment. 

Q10. What is Geitonogamy ? 

Ans. Transfer of pollengrains from the anthers to the stigma of another flower of the same plant. 

Q11. What is ‘Pomato’ ? 

Ans. When protoplast of tomato is fused with that of potato having hybrid plants combining tomato & potato characteristics. 

Q12. Which diagnostic test is widely used to detect AIDS ? 


Q13. Name causative organism of Typhoid. 

Ans. Salmonella typhi

Q14. Write the full form of IRRI. 

Ans. International Rice Research Institute


Q1. Which of the following is an autosomal linked recessive trait ? 

(A) Sickle cell anaemia 

(B) Phenylketonuria 

(C) Both (A) & (B) 

(D) Haemophilia 

Ans. (C) Both (A) & (B) 

Q2. In 1938 Coelacanth was Caught from : 

(A) North America 

(B) South America  

(C) India 

(D) South Africa 

Ans. (D) South Africa 

Q3. The hydrolysis of nucleoside would not yield : 

(A) Purine   

(B) Pyramidine   

(C) Pentose sugar 

(D) Phosphoric acid 

Ans. (D) Phosphoric acid 

Q4. How many genes are present in human Chromosome No. 1 ? 

(A) 231 

(B) 456 

(C) 2968 

(D) 3600 

Ans. (C) 2968 

Q5. Which is a secondary lymphoid organ ? 

(A) Spleen 

(B) Bone marrow 

(C) Thymus 

(D) None of these  

Ans. (A) Spleen 

Q6. What is ‘autogamy’ ? 

Ans. Transfer of pollen grains from the anther to stigma of the same flower. 

Q7. What is gene therapy ? 

Ans. A collection of methods that allow correction of a gene defect that has been diagnosed in a Embryo/child. 

Q8. Name one physical mutagen. 

Ans. UV radiations

Q9. What are false fruits ? Give an example. 

Ans. When thalamus also contributes to fruit formation. ex : Apple, Strawberry, Cashew etc. 

Q10. What is ex-situ conservation ? 

Ans. Threatened animals & plants are taken out from their natural habitat & placed in a special setting for protection & special care.

Q11. What is biofortification ? 

Ans. Breeding crops with higher level of vitamins & minerals or higher proteins & heal their fats.  

Q12. By which test typhoid fever could be confirmed ? 


Q13. Name causative organism of Elephantiasis. 

Ans. Wuchereria bancrofti 

Q14. Write the full form of IARI. 

Ans. Indian Agricultural Research Institute 


Q1. Which of the following syndrome is an example of monosomy ? 

(A) Down 

(B) Klinefelter 

(C) Turner 

(D) None of these  

Ans. (C) Turner 

Q2. How many mya jawless fish probably evolved ? 

(A) 320 

(B) 350 

(C) 400 

(D) 500 

Ans. (B) 350

Q3. Bases in two strands of DNA are paired by which of the followings bond ? 

(A) Phosphodiester 

(B) N-glycosidic 

(C) Peptide 

(D) Hydrogen 

Ans. (D) Hydrogen 

Q4. rRNA is transcribed by : 

(A) RNA polymerase I 

(B) RNA polymerase II 

(C) RNA polymerase III 

(D) DNA polymerase 

Ans. (A) RNA polymerase I 

Q5. Which of the following is present at the chalazal end of the embryo sac ? 

(A) Synergids  

(B) Antipodals 

(C) Central cell 

(D) Egg cell 

Ans. (B) Antipodals 

Q6. The protein encoded by which gene controls corn borer ? 

Ans. CryIAb

Q7. What is the scientific name of fruit fly ? 

Ans. Drosophila melanogaster 

Q8. What is Endemism ? 

Ans. When species confined to that region & not found anywhere else. 

Q9. What is ‘hypocotyl’ ? 

Ans. The portion of embryonal axis below the level of cotyledons, that terminates at its lower end in the radicle. 

Q10. ‘Himgiri’ variety of wheat is resistant to which disease ? 

Ans. Leaf and stripe rust 

Hill bunt 

Q11. What is ‘interferon’ ? 

Ans. Interferons are proteins secreted by virus infected cells which protect non-infected cells from further viral infection. 

Q12. Name causative organism of Amoebiasis. 

Ans. Eutamoeba histolytica

Q13. What is autoimmune disease ? Give an example. 

Ans. When body attacks self cells which cause damage to the body. ex : Rheumatoid arthritis. 

Q14. Write the full form of SCP. 

Ans. Single Cell Protein

Other Questions (Coming Soon…) 

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