Biology Times March 19
(c) Mycobacterium (d) Escherichia coli
- Isinglass is employed in
(a) Clarification of vinegar, beer and wine.
(b) Purification of vinegar, beer and wine.
(c) Distillation of vinegar, beer and wine.
(d) Preservation of vinegar, beer and wine.
- Pollen grains of a plant whose 2n=28 are cultured
to get callus by tissue culture method. What would
be the number of chromosome in the cells of the
callus?
(a) 28 (b) 14
(c) 56 (c) 7
- b 2. a 3. d 4. a 5. a
- b 7. d 8. c 9. d 10. c
- b 1 2. d 1 3. c 14. a 15. b
- b 17. c 18. c 19. b 20. c
2 1. b 2 2. b 2 3. d 24. b 25. d
- c 27. d 28. a 29. b 30. b
- d 32. d 33. d 34. a 35. d
- c 37. c 38. c 39. b 40. b
- b 42. a 43. d 44. a 45. b
1.Sol: Binomial nomenclature is the widely accepted
naming of plants and animals all over the world
in order to avoid confusions caused by vernacular
names
3.Sol: Seaweeds are rich in Iodine and this contributes
for goitre cure.
4.Sol: Chlorophyll, Fucoxanthin and Phycoerythin
are Green, Brown and Red pigments respectively.
5.Sol: After double fertilisation in angiosperms, the
zygote develops into an embryo and primary
endosperm nucleus (PEN) develops into endosperm
which provides nourishment to the developing
embryo.
6.Sol: The leaf is green, lateral appendage, borne
on the node of the stem and bears bud in its axil,
exogenous in origin and develops from the leaf
primordia of shoot apex. The main function of
the leaf is to synthesize food in the process of
photosynthesis.
7.Sol: Insectivorous plants trap insects for extra diet
further and are not solely dependent on them as
they can photosynthesize. Eg. Nepenthes
10.Sol: The shoot apical meristem is present at the
tip of the plant and its branches.They produce
growth in length. As the twig possess 4 branches
,the number of the shoot apical meristem is 5
including one of the twig itself.
12.Sol: Red dinoflagellates Eg: Gonyaulax undergo
rapid multiplication that they make the sea appear
sea red ( Red tides)
14.Sol: Prokaryotic cell is usually 0.1-2.0mm
15.Sol: A Polyribosome or Polysome is a complex of
an mRNA molecule and two or more ribosomes
act to form polypeptide chains during active
translation.
16.Sol: The shrinkage of protoplasm of the cell
clearly indicates the plasmolysed cell.
17.Sol: The guard cells of land plants are specialised
epidermal cells which contain chloroplast. In rest
of the epidermal cells, chloroplast are absent.
Even though guard cells have chloroplast they
are poor in performing photosynthesis as there is
absence of NADP reductase enzyme.
18.Sol: An apoenzyme is an inactive enzyme,
activation of the enzyme occurs upon binding of
an organic or inorganic cofactor. Therefore, the
Assertion is true but Reason is false.
19.Sol:
A. Cotton fibre - Cellulose
B. Exoskeleton of cockroach - Chitin
C. Liver - Glycogen
D. Peeled potato - Starch
20.Sol: The fall of photosynthetic yield beyond red
region of spectrum is called red drop. Reaction
center of PS II shows red drop effect.
21.Sol: Conceptual
22.Sol: If a cell contains 36 chromosomes, the
number of chromosomes in each of 4 daughter
cells resulting from meiosis will be 18. This is
due to meiosis, in which four daughter cells are
produced and chromosome number is reduced to
half as compared to its parent cell.
23.Sol: Kreb’s cycle is a common pathway of
oxidative breakdown of carbohydrates, amino
acids and fatty acids. Amino acids enter
kreb’s cycle as glutamate and aspartate after
their deamination. Fats produce fatty acids and
glycerol. Glycerol is phosphorylated and oxidised
