HBSE Class 12 Biology Question Paper 2019 Answer Key

HBSE Class 12 Biology Question Paper 2019 Answer Key 

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 


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