BOTANY (2020 SAY)
ANSWERS
1. (b) Lichen
2. (d) Kangaroo rat
3. Nutrition
4. Expanding/ Broad based age pyramid.
5. Emphysema
6. (a) Algal bloom is the presence of large amount of nutrients in
water resulting in excess growth of planktonic algae.
(b) i) imparts a distinct colour
to the water bodies.
ii) cause deterioration of
water quality and fish mortality.
7. (a) Leech / Earthworm.
(b) It is the organism that
has both male and female reproductive organs.
8. Scrubber: Removes gases like sulphur dioxide from exhaust.
Electrostatic precipitator: Removes particulate matter
present in the exhaust.
9.
|
A |
B |
|
(a) Ginger |
Rhizome |
|
(b) Water hyacinth |
Offset |
|
(c) Agave |
Bulbil |
|
(d) Bryophyllum |
Leaf bud |
10. (a) Denaturation
(b) Annealing
(c) Extension
(d) Taq polymerase
11. (a) Anthers and stigma lie close to each other. They are not
exposed.
(b) It is the transfer of
pollen grains from the anther to the stigma of the same flower.
12. E = Escherichia (Genus name of bacteria)
Co = Coli (Species name of
bacteria)
R = Strain
I = First extracted enzyme
(Order of extraction).
13. (a) Biomagnification.
(b) High concentrations of
DDT disturb calcium metabolism in birds that causes thinning of eggshell.
14. GEAC = Genetic Engineering Approval Committee.
ADA = Adenosine deaminase.
15. (a) a. Funicle, b. Micropyle, c. Integuments.
(b) Protective covering of
ovule.
16. (a) Bacillus thuringiensis.
(b) cryIAc, cryIAb, cryIIAb
17. (a) (i) Collection of
variability
(ii) Evaluation and
selection p
(iii) Cross hybridisation
among
(iv)Selection and testing
of
(v) Testing, release and commercialization
of new cultivars
(b) Sonalika/ Kalyan Sona
18. (a) i. 0 ii.
Mutualism.
(b) Mutualism is the
interaction that confers benefits for both interacting species.
(c) Orchid and Mango tree /
Grazing cattle and egret etc.
19. (a) Synergids and egg.
(b) In this, one of the
megaspores is functional while other three are degenerate.
20. (a) 1. Fragmentation, 2. Leaching, 3. Catabolism, 4.
Humifaction, 5. Mineralization.
(b) Earthworm.