- AThey are composed of only one type of cells
- BOnly one type of cells responsible to perform one common function is called tissue
- ✓A group of one or more types of cells performing one common function is called tissue
- DNone of the above
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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 :
$I$. Each cell of sporogenous tissue in anther is capable of giving rise to microspore tetrad.
$II$. The pollen grain represent male gametophyte.
$III$. Pollen grains are usually triangular and $10-15 \mu m$ in diameter.
$IV$. Sporopollenin is one of the most resistance organic material which can be destroyed only by strong acids
and alkali.