What is heterospory and seed habit in pteridophytes?
What is heterospory and seed habit in pteridophytes?
Heterosporous refers to the plants producing different types of spores that are different in structure, size and function. They produce two kinds of spores, smaller microspores and bigger megaspores. Heterospory is found in some pteridophytes and all seed plants, i.e. gymnosperms and angiosperms.
What is heterospory how heterospory leads to seed habit in pteridophytes?
The adoption of heterospory and the retention and germination of a single megaspore within megasporangium to form a female gametophyte, led to the phenomenon of “seed habit”, a characteristic feature of the spermatophytes.
What is heterospory how it leads to seed habit?
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.
In which pteridophytes seed habit is found?
Fertilization and formation of embryo take place within the megasporangium. The embryo undergoes a resting period. Selaginella exhibits a remarkable approach to the seed habit the characteristic of the spermatophytes because of the following features: The heterospory occurs in almost all the species of Selaginella.
What is the importance of heterospory in pteridophytes?
– 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. – The seed habit is the most complex and evolutionary successful method of sexual reproduction.
In which Pteridophytes seed habit is found?
What is the importance of Heterospory in Pteridophytes?
Which Pteridophytes show origin of seed habit?
Heterosporous pteridophytes show certain characteristics, which are precursors to the ‘seed habit’ in gymnosperms.
