In Pinus/gymnosperms, the haploid structure are

Options

A. megaspore, endosperm and embryo
B. megaspore, pollen grain and endosperm
C. megaspore, integument and root
D. pollen grain, leaf and root

Answer

B

Explanation

(b) In gymnosperms, the megaspore (haploid) is first cell of female gametophyte and undergoes repeated divisions to form a multicellular female gametophyte, which because of abundant food reserves, serves as endosperm. So, being produced before fertilisation, endosperm is haploid in gymnosperms. Microspored or pollen grains are the first cell of the male gametophyte and are haploid in nature.