Pollen grains are generally _________ in outline measuring _________ micrometers in diameter.
Spherical, $25-50$
Oblong, $25-50$
Oval, $10-25$
Spherical, $75-100$
Spherical $25-50 \mu m$
Explain the role of tapetum in the formation pollen-grain wall.
How many pollen grains are formed from $10$ microspore mother cells by meiosis
Pollen kit material is secreted by
Describe the process of Microsporogenesis.
In a pollen grain, larger nucleus is
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