What is heterospory? Briefly comment on | Class 11 Biology Chapter Plant Kingdom, Plant Kingdom NCERT Solutions

Question: What is heterospory? Briefly comment on its significance. Give two examples.

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.

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Comments

Chandan chandragutti
2019-10-02 12:55:23

But give the app for all

Chandan chandragutti
2019-10-02 12:54:58

Thanks

Chandan chandragutti
2019-10-02 12:54:27

It is good thanksðð

ANIJA A R
2019-09-28 19:35:13

Thank u

Nilesh vishnoi
2019-09-19 17:52:16

Nice

Kavitasaini
2019-09-16 08:35:08

Thanks a lot

Manas
2019-09-15 09:19:01

Really it help me a lot

Bdn
2019-08-11 21:58:04

Thank you so much

Nisha
2019-08-01 22:55:41

Thank you so much

Ved Mani Sharma
2019-07-30 23:00:59

Very good, too accurateððð

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Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 7: What is heterospory? Briefly comment on its significance. Give two examples.....

What is heterospory? Briefly comment on | Class 11 Biology Chapter Plant Kingdom, Plant Kingdom NCERT Solutions

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