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Which of the following is correct w.r.t compound pollen?
a) It is formed when all four pollen of a tetrad remain attached.
b) It is seen in Typha.
c) It is formed of a complete anther lobe.
d) It is a feature of gymnosperms.
Option: 1
a, b & c
Option: 2
a, b & d
Option: 3
a & b
Option: 4
a & c
Answers (1)
As we have learnt:
Microsporogenesis:
- The formation of microspores or pollen grains inside the microsporangium is known as microsporogenesis.
- When the anther is young, a layer of homogenous cells occupies the centre of each microsporangium, is known as sporogenous tissue.
- It is diploid in nature.
- The sporogenous tissue transforms into microspore or pollen mother cells.
- These microspore mother cells undergo meiotic divisions to form microspore tetrads (four microspores) which are haploid.
- These microspores mature to form pollen grains, male gametes.
- One microspore mother cell forms four microspores.
- The microspores develop to form the pollen grains.
- In some cases, all the four pollens remain attached to form compound pollen grain, as seen in Typha.
- In Calotropis, all the pollen grains of an anther lobe remain united in a single sac called pollinium.
- Each microsporangium contains thousands of microspores or pollen grains.
In some cases, all the four pollens remain attached to form compound pollen grain, as seen in Typha.
Hence, the correct answer is option c.
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