Which of the following is a secondary pollutant
(1) CO
(2) ``CO_2``
(3) ``SO_2``
(4) ``O_3``

A woman has an X-linked condition on one of her
X chromosomes. This chromosome can be
inherited by :-
(1) Only daughters
(2) Only sons
(3) Only grandchildren
(4) Both sons and daughters

The product(s) of reaction catalyzed by nitrogenase
in root nodules of leguminous plants is/are :
(1) Ammonia alone
(2) Nitrate alone
(3) Ammonia and oxygen
(4) Ammonia and hydrogen

The plant parts which consist of two generations -
one within the other :
-(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male
gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
(1) -(a) only
(2) -(a), (b) and (c)
(3) (c) and (d)
(4) -(a) and (d)

Identify the wrong statement with reference to
immunity.
(1) When exposed to antigen (living or dead)
antibodies are produced in the host’s body.
It is called “Active immunity”.
(2) When ready-made antibodies are directly
given, it is called “Passive immunity”.
(3) Active immunity is quick and gives full
response.
(4) Foetus receives some antibodies from
mother, it is an example for passive
immunity.