Question

Identify each part in the flowering plant and write whether it is haploid (n) or diploid (2n).
(a) Ovary
(b) Anther
(c) Egg
(d) Pollen
(e) Male gamete
(f) Zygote

Answer 1

All the parts of a flowering plant are diploid, That is stem, roots, leaves, branches etc. But in case of lower, different parts of the flower are either haploid or diploid.

Complete answer:
Having two sets of chromosomes in each cell, one set from each parent is known as diploid. Cells other than human sex cells in humans are diploid and have 23 pairs of chromosomes. A single set of chromosomes in each cell is known as haploid.

(a) Ovary- It is the female part of the plant and the female organ of flowers that has ovules. The ovules develop into seeds upon fertilization. It is diploid (2n) in structure.
(b) Anther- It is the part of the stamen where pollens are produced. It is the male part of the flower and it contains pollen grains. It is diploid in structure (2n).
(c) Egg- A structure called ovule in seed plants contains the female gametophyte. These gametophytes produce egg cells. It is a haploid structure (n).
(d) Pollen- It is the powdery product synthesized by seed plants. Pollens produce male gametes which is a haploid (n) structure.
(e) Male gamete- The male gametes consist of two sperm cells within a pollen tube or pollen grain tube. These are derived from a single generative cell, which is formed after meiosis as the smaller cell in the microspore by unequal cell division. Male gametes are produced in the anther. It is a haploid (n) gamete.
(f) Zygote- It is formed by the fusion of female and male gametes. It is diploid in structure (2n).

Note: Plants have two distinct multicellular stages in their life cycles, in contrast to the diplontic and haplontic life cycles a phenomenon called alternation of generations. These two stages are the multicellular diploid sporophyte and the multi cellular, haploid gametophyte. This is different from most types of animal reproduction in which there is only one multicellular stage: a diploid organism produces single-celled haploid gametes.