Question

Heterospory originates in pteridophytes and it is the production of
1) Large and small pores
2) Micro and megaspores
3) Haploid and diploid spores
4) Both 1 and 2​

Answer 1

Answer:

Option (b) is the correct answer.

Explanation:

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Answer 2

The correct solution is option b. Heterospory is the production of micro and megaspores.

• Pteridophytes are the first terrestrial vascular plants.
• In some species, the formation of two types of spores is evidently found, which is differing in their size and function. This condition is called the heterosporous condition. eg. Selaginella and Marsilea
• The spore-bearing leaves are called sporophylls.
• The small, haploid spores that contain the male gametophyte is called microspores.
• The large, haploid spores that consist of the female gametophyte is called megaspores.
• Heterospory is evolved during the Devonian period.
• Natural selection paved the way towards an increase in the propagule size compared to the smaller spores of homosporous plants.
• The development of heterosporous plants proposed to be started with the separation of sporangia.