(a) Ovary —diploid (2 n)

(b) Anther —diploid (2n)

(c) Egg —haploid ( n)

(d) Pollen —haploid ( n)

(e) Male gamete —haploid (n)

(f) Zygote —diploid (2n)

Explanation: Since ovary & anther undergoes only mitotic divisions during their development in which chromosome number remains the same, so these structures are diploid. The zygote is formed by the fusion of both male and female gametes (haploid structures) .So, when two haploid structures fuse the resultant is a diploid structure i.e.zygote.

Egg, pollen, male gamete undergoes meiosis during their development, which reduces the chromosome number to half , hence these are haploid structures.