MCQ
The affinity of $CO$ with $Hb$ is more than oxygen by:
- A$20$ times.
- BBoth.
- ✓$2000$ times.
- DNone of these.
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Choose the correct combination of $A$ and $B$
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 :
$R-$ Tropomyosin is a rod - shaped fibrous protein. Tropomyosin forms two helical strands, which are wrapped around the $G-$ actin.