Question
Evolution is not a direct process, but a stochastic process, based on chance events in nature. Justify.
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Match cells of immune system in column-I and their functions in column-II and rewrite it.
| column-l | column-II | ||
| i. | Cytotoxic T cells | (a) | Activation of helper T cells |
| ii. | Plasma cells | (b) | Blood group antigens |
| iii. | Antigen presenting cells | (c) | Secretion of perforins |
| iv. | Red blood cells | (d) | Antibody production |
|
S.No.
|
Type of Barrier
|
S.No.
|
Barrier
|
|
a.
|
Physical
|
i.
|
Skin, a
|
|
b.
|
Physiological
|
ii.
|
b, in the eye
|
|
c.
|
c
|
iii.
|
Interferon
|
|
d.
|
Cellular
|
iv.
|
WBC, d
|