Heterospory and seed habit are often discuseed in relation to a structure called .

Options

A. spathe
B. bract
C. petiole
D. ligule

Answer

D

Explanation

Heterospory and seed habit are discussed mostly with respect to liyulc Development of two types of spores (microspores and megaspores) is called heterospory Though all seed-bearing plants are heterospory. Though all seed-bearing plants are heterosphytes, it eveolved in some pteridophytes. In early heterosporous plants, magaspores were released form the parent.
But in seed plants, these are retained and fertilised to become seed. This habit is seen in Selaginella which bears a small multicellular scale-like structure called ligule at the base of leaf on adaxial side.