1. Tardigrade
  2. Question
  3. Biology
  4. Selaginella nearly approaches seed habit because it shows (1) heterospory (2) retention of megaspore in mega sporangium till the development of young sporophyte (3) presence of ligulate leaves (4) sexual type of reproduction

Q. Selaginella nearly approaches seed habit because it shows
(1) heterospory
(2) retention of megaspore in mega sporangium till the development of young sporophyte
(3) presence of ligulate leaves
(4) sexual type of reproduction

 2102  238 BHUBHU 2009 Report Error

Solution:

Selaginella is a heterosporous pteridophyte that nearly approaches seed habit. Heterospory (Production of spores of two different sizes and two different developmental pattersns ie, microspones and megaspores) is considered to be a prerequisite to seed formation. Besides it, Selaginella also shows retention of megaspore in the megasporagium till the development of young sporophyte which is an important step towards seed formation.