Morphology of Flowering PlantsMedium
Question
Heterospory and seed habit are often discussed in relation to a structure called
Options
A.spathe
B.bract
C.petiole
D.ligule
Solution
Development of two types of sporse (microspores and megaspores) is called heterospory. Though all seed-bearinh plants are heterosporous, it evolved in some pteridophytes. In eary heterosporous plants, megaspores were released from the parent. But in seed plants, these are retained and fertilized to become seed. This habit is seen is Selaginella which bears a small multicellular scale-like structure called ligule at the base of leaf on adaxial side.
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