Is this statement correct- diploid sex cell divides to form 4 haploid sex cells. both the diploid and haploid were sex/germ cells but only the haploid cells are either sperm or egg.

In Citrus and Opuntia, the agamospermy is due to

(A) Diploid egg cell

(B) Diploid sporophytic cell

(C) Haploid egg cell

(D) Haploid female gamete

I know this is a weird question but when I learn a a concept for the first time I always have weird questions.

Q- As this is true= Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome.So only the haploid cells resulting from meiosis can be called sex cells in this case.

Then what is the name of the cell which is known to be diploid and divides into 4 daughter cells in meiosis? If it is a sex cell itself, then how can it be diploid if all sex cells are haploid.

A multicelluar, filamentous alga exhibits a type of a sexual life cycle in which the meiotic division occurs after the formation of zygote. The ad adult filament of this alga has
(a) Haploid vegetative cells and diploid gametangia
(b) Haploid vegetative cells and diploid gametangia
(c) Diploid vegetative cells and haploid gametangia
(d) Haploid vegetative cells and haploid gametangia

Are antipodal cells and synergids haploid or diploid . how?