You are currently viewing Class 12 Biology MCQs Chapter – 8
Class 12 Biology MCQs Chapter - 8

Class 12 Biology MCQs Chapter – 8

1.HIV attacks :

( A ) B-lymphocytes

( B ) Antibodies

( C ) T-lymphocytes

( D ) Erythrocytes

Answer-( C )

 

2. Aquatic fern which is an excellent biofertiliser :

( A ) Azolla

( B ) Salvinia

( C ) Marsilea

( D ) Pteridium

Answer-( A )

 

3. Most famous bacterial fertilizer is :

( A ) Nitrosomonas

( B ) Nitrobacter

( C ) Nitrosococcus

( D ) Rhizobium

Answer-( D )

 

4. Group of bacteria used in biogas production is :

( A ) Eubacteri

( B ) Organotrophs

( C ) Methanotrophs

( D ) Methanogens

Answer-( D )

 

5. Stimulant found in Cola, Tea and Cocoa is :

( A ) Cocaine

( B ) Tannin

( C ) Amphetamine

( D ) Caffeine

Answer-( D )

 

6. Opiates and heroin are obtained from :

( A ) Thea

( B ) Papaver

( C ) Cannabis

( D ) Theobroma

Answer-( B )

 

7. Heroin is got from plant of Family:

( A ) Leguminosae

( B ) Papaveraceae

( C ) Liliacae

( D ) Solanaceae

Answer-( B )

 

8. Stem cells arise from :

( A ) Yolk sac

( B ) Liver of foetus

( C ) Bone marrow

( D ) All

Answer-( D )

 

9. Which antibody initatiates allergic reaction ?

( A ) IgM

( B ) IgE

( C ) IgD

( D ) IgA

Answer-( B )

 

10. The drug that functions as depresent of CNS is :

( A ) Amphetamine

( B )Caffeine

( C ) Opium

( D ) Hallucinogen

Answer-( C )

 

11.LSD is :

( A ) Narcotic

( B ) Stimulant

( C ) Antidepresent

( D ) Hallucinogen

Answer-( D )

 

12.Stimulant cocaine is obtained from :

( A ) Rauwolfia

( B ) Erythroxylon

( C ) Papaver

( D ) Eucalptus

Answer-( B )

 

13.AZT is used in treatment of

( A ) Malaria

( B ) AIDS

( C ) T.B.

( D ) Kala-azar

Answer-( B )

 

14. In certain cases for early and accurate detection of disease we may use

( A ) ELISA

( B ) Culture

( C ) Chemical

( D ) Analytical

Answer-( A )

 

15. Tuberculosis is transmitted by-

( A ) Air

( B ) Water

( C ) Insect

( D ) Contact

Answer-( A )

 

16. Opium is obtained from

( A ) Papaver somniferum

( B ) Erythroxylum coca

( C ) Cannabis sativa

( D ) Atropa belladonna

Answer-( A )

 

17. B-lymphocytes are produced in

( A ) Bone marrow

( B ) Thymus

( C ) Blood

( D ) Lymph

Answer-( A )

 

18. In retroviruses, genetic material is :

( A ) RNA

( B ) DNA

( C ) hn RNA

( D ) Split gane

Answer-( A )

 

19. The common cold is caused by

( A ) Rhino virus

( B ) Streptococcus pneumoniae

( C ) Salmonella typhi

( D ) Pasmodium vivax

Answer-( A )

 

20. A Toxic substance responsible for chill and high fever in Malaria is

( A ) Interferon

( B ) haemozoin

( C ) hirudin

( D ) colostrum

Answer-( B )

 

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