Biology 10+2 level

Biology 10+2 level
10+2 in Biology
Biology (PCB) at 10+2 level

1. Carapace is present on the dorsal surface of: (a) Elephant
(b) Tortoise
(c) Python
(d) Alligator
Ans. (b)
2. Exoskeleton is absent in:
(a) Scoliodon
(b) Frog
(c) Rabbit
(d) Fowl
Ans. (b)
3. ‘Heart, of heart’ is:
(a) SA node
(b) AV node
(c) Bundle of His
(d) Purkinje fibers
Ans. (a)
4. Which of the following is phagocytic?
(a) Monocyte
(b) RBC.
(c) Eosinophil
(d) Basophil
Ans. (b)
5. Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as:
(a) Antibiosis
(b) commensalisms
(c) Predation
(d) Parasitism
Ans. (b)
6. Intercalated disc is found in:
(a) Muscles of heart
(b) Vertebrae
(c) Muscles of legs
(d) Public symphysis
Ans. (a)
7. Which of following is ‘immortal’?
(a) Somatic cell
(b) Glomerular cells
(c) Germ cells
(d) Cells of pituitary
Ans. (c)
8. Nerve cell does not divide because they do not have:
(a) Nucleus
(b) Centro some
(c) Golgi body
(d) Mitochondria
Ans. (b)
9. During strenuous exercise; glucose is converted into:
(a) Glycogen
(b) Pyruvic acid
(c) Starch
(d) Lactic acid
Ans. (d)
10. ‘AIDS’ is due to:
(a) Destruction of killer-T-cells
(b) Destruction of helper-T-cells
(c) Lack of interferons
(d) Autoimmunity
Ans. (b)
11. ‘Adaptation’ of eyes in dark is due to:
(a) Depletion of vision pigment in rod
(b) Depletion of vision pigment in cones
(c) Repletion of visior pigment in rods
(d) Repletion of vision pigment in cones
Ans. (c)
12. Sea gulls excrete excess of NaC1 from:
(a) Liver
(b) Lungs
(c) Nasal cavity
(d) Kidney
Ans. (c)
13. Tree of life is:
(a) Arbor vitae
(b) Pons varolii
(c) Organ of Corti
(d) Diencephalons
Ans. (a)
14. Thousands of years old mummies are still in their condition as they were before due to the non destruction of:
(a) Yellow elastic fibers
(b) White elastic fibers
(c) Collagen fibers
(d) Veins
Ans. (a)
15. Which of the following is correctly matched?
(a). Wallago attu —Lachi
(b) Tengra —Carp
(c) Catla-catla —Cat fish
(d) Paya.s —Carp
Ans. (a)
16. Two animal cells are interconnected by:
(a) Plasmodesmata
(b) Cell wall
(c) Desmosomes
(d) Plasma membrane
Ans. (c)
17. Which of the following vitamins is water soluble as well as anti-oxidant?
(a) Vitamin-B1
(b) Vitamin-A
(c) Vitamin-D
(d) Vitamin-C
Ans. (d)
18. Which of the following amino acids is not optically active?
(a) Glycine
(b) Valine
(c) Leucine
(d) Isoleucine
Ans. (a)
19. Human ear ossicles are:
(a) Incus and stapes
(b) Stapes
(c) Incus, malleus and stapes
(d) Incus and malleus
Ans. (c)
20. Transposons are:
(a) House-keeping genes
(b) Jumping genes
(c) Transporting genes
(d) Stationary genes
Ans. (b)
21. The biogenetic law of Haeckel is:
(a) Omnis vivum-e-vivum
(b) Omnis cellula-e-cellula
(c) Ontogeny repeats phylogeny
(d) Phylogeny repeats ontogeny
Ans. (c)
22. FSH is secreted by:
(a) Anterior lobe of pituitary
(b) Hypothalamus
(c) Gonads
(d) Posterior lobe of pituitary
Ans. (a)
23. Tube feet is the locomotory organ in:
(a) Starfish
(b) Jelly fish
(c) Silver fish
(d) Scoliodon
Ans. (a)
24. Flame cells are excretory organ of:
(a) Planaria
(b) Hydra
(c) Hydrilla
(d) Cockroach
Ans. (a)
25. Which of the following is not done in a wild life sanctuary?
(a) Fauna is conserved
(b) Flora is conserved
(c) Soil and flora is utilised
(d) Hunting is prohibited
Ans. (b)