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Class 12 Biology Questions

1. ICBN stands for
a) International code of Botanical Nomenclature
b) International Congress of Biological Names
c) Indian Codes of Botanical Nomenclature
d)  Indian congress of Biological Names

2. Which of the following produces antibodies in blood?
a) Neutrophils
b) Eosinophil
c) Monocyte
d) Lymphocyte

3. Cells of Cardiac muscles are


Cardiac muscle
Cardiac muscles
a) Voluntary
b) Non striated
c) Spindle shaped
d) Branched

4. Myxedema is due to the deficiency of
a) Insulin
b) Proteins
c) Calcitonin
d) Thyroxin

5. Which of the following is not an analogous organ?
a) Wings of a bat
b) Wings of an insect
c) Fore limbs of a horse
d) Wings of abird

6.  A viral disease of man is
a) Tetanus
b) Poliomycelitis
c) diptheria
d) Leprosy

7. Gamete contains
a) Both alleles of a gene
b) One allele of a gene
c) All allele of a gene
d)  Four alleles of a gene

8. Cutaneous respiration takes place in
a) Whale
b) Earth worm
c)  Bat
d)  Fish

9.RNA which carries information from DNA for protein synthesis
a) m RNA                 
b) s- RNA
c) t- RNA
d) r-RNA

10. Genetic disorders in developing foetus can be detected by
a) Laproscopy
b) Dialysis
c)  X-Rays
d)  Aminocentesis

11. The digestive gland of prawn is
Hepatopancreas

a)  Liver
b) Pancreas
c)  Stomach
d)  Hepatopancreas

12. The exchange of respiratory gases in the lung occur in:
a) Trachea
b) Bronchi
c) Bronchiole
d)  Alveoli

13. The pace maker of the human heart is the
a)  AV node
b) SA node
c)  Nerve
d)  Purkinje fibres

14. The folding of a joint by drawing one articulating bone to the other is done by:
a)  Pronator muscle
b) Flexor muscle
c)  Extensor muscle
d) Suspinator muscle

15. The central fluid filled cavity of the blastula is known as
a) Archenteron
b) Blastocoel
c)  Blastocyst
d)  Morula

16.  The first photosynthesis organism were:
a) Cyanobacteria
b) Coacervates
c)  Organic polymers
d) Primodial Soup

17.  Organs similar in function but differing in structure and origin are:
a)  Vestigial organs
b) Analogous organs
c) Homologous organs
d) None of these

18. The theory of evolution of Natural selection was put forward by;
a) Lamark
b) Darwin
c)  Wiesmann
d)  Lederberg

19. The OX individual exhibits:
a) Down’s syndrome
b) Turners syndrome
c)  Kinefelter’s syndrome
d) Marfan syndrome

20. The deficiency of thyroxine in children results in
a) Dwarfism
b) Gigantism
c)  Cretinism
d)  Myxedema

Answers
1. a) International code of Botanical Nomenclature
2. d) Lymphocyte
3. d) Branched
4. d) Thyroxin
5. c) Fore limbs of a horse
6.  b) Poliomycelitis
7. b) One allele of a gene
8.  b) Earth worm
9. a) m RNA
10.d)  Aminocentesis      
11.  d)  Hepatopancreas
12.  d)  Alveoli
13.  b) SA node
14.  b) Flexor muscle
15.  b) Blastocoel
16.  a) Cyanobacteria
17.  b) Analogous organs
18.  b) Darwin
20.  d)  Myxedema

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