Select the correct Statement .
a. Intine of pollen grains is composed of pectocellulosic in nature .
b. Pollen grains develop from the haploid microspore mother cells in pollen sacs of anther.
c. Pollen grain is diploid , unicellular , multinucleate and oval shaped structure.
d. Pollen grains are generally spherical measuring about 20-25 mm in diameter .
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I think option (a) is correct
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