Question

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Explain the Phenomenon of heterospory in plant .

Answer 1

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✔Develpoment of two types of spores is known as heterospory and the plants are known as heterosporous.

✔Megaspores produce female gametophyte while microspore produce male gametophyte.

✔In seed bearing plants the gametophytes produced by megaspores and microspores are very small and never released from the spores.

✔This retention and germination of the megaspore within the megasporangium ensures proper development of the zygote.

✴Thus heterospory is considered an important step in evolution as it is a precursor to the seed habit.

Answer 2

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Here is your answer -

• Heterospory is a phenomenon in which two kinds of spores are borne by the same plant. These spores differ in size. The smaller one is known as microspore and the larger one is known as megaspore. The microspore germinates to form the male gametophyte and the megaspore germinates to form the female gametophyte. The male gametophyte releases the male gametes and these reach the female gametophyte to fuse with the egg. The development of the zygote takes place inside the female gametophyte.
• This retention and germination of the megaspore within the megasporangium ensures proper development of the zygote. The zygote develops into the future sporophyte. The evolution of the seed habit is related to the retention of the megaspore.
• Heterospory is thus considered an important step in evolution as it is a precursor to the seed habit.
• Heterospory evolved first in pteridophytes such as Selaginella and Salvinia.