Question

Heterospory is a development towards seed habit. Do you agree?

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Answer 1

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$\large\purple{Question}$

Heterospory is a development towards seed habit. Do you agree?

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1. Yes. Production of two types of spores by a plant is called heterospory. Eg: Selaginella.

2. Large spores are called megaspores and small

spores are called microspores. Megaspore Female gametophyte → Archegonia → egg.

Microspore Male gemetophyte → Antheridia → Antherozoids.

3. The two gametophytes remain protected inside the respective spores in the sporophytic phase.

4. Microspores are dispersed by wind and reach the Megaspore. The antherozoid fuses with the egg to form zygote.

5. Thus the gametophytic generation is completed in the sporophyte plant itself. Only after zygote formation the female gametophyte is shed from the sporophyte.

6. This is a basic requisite for seed habit.

Answer 2

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◇ Yes. Production of two types of spores by a plant is called heterospory. Eg: Selaginella.

◇ Large spores are called megaspores and small spores are called microspores.

◇ Megaspore Female gametophyte → Archegonia → egg.

◇ Microspore Male gemetophyte → Antheridia → Antherozoids.

◇ The two gametophytes remain protected inside the respective spores in the sporophytic phase.

◇ Microspores are dispersed by wind and reach the Megaspore. The antherozoid fuses with the egg to form zygote.

◇ Thus the gametophytic generation is completed in the sporophyte plant itself. Only after zygote formation the female gametophyte is shed from the sporophyte.

◇ This is a basic requisite for seed habit.