MCQ
Klinostat is employed in the study of:
- AOsmosis.
- BGrowth movements.
- CPhotosynthsis.
- DRespiration.
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$R :$ These have aglomerular kidney $i.e.$, no filtration occurs and tubular secretion is the only way of excretion.
| List $- I$ | List $- II$ |
| $(a)$ $S$ phase | $(i)$ Proteins are synthesized |
| $(b)$ $G_2$ phase | $(ii)$ Inactive phase |
| $(c)$ Quiescent stage | $(iii)$ Interval between mitosis and initiation of $DNA$ replication |
| $(d)$ $\mathrm{G}_{1}$ phase | $(iv)$ $DNA$ replication |
Choose the correct answer from the options given below.
$(a) -(b) -(c)- (d)$
Assertion $A:$ In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.
Reason $R$ : Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.
In the light of the above statements, choose the correct answer from the options given below :