Question

Pollen drop of gymnosperm is
A. Red drop
B. Pollen dropped by wind
C. Nucellus secretions
D. Malic acid drop

Answer 1

Pollen is a male gametophyte that can help in the fertilization of the plant, and pollen in a gymnosperm or a flowering plant undergoes pollination that can be either self-pollination or cross-pollination.

Complete step by step answer: In gymnosperms, the pollen drop is a liquid drop or a liquid nucellus secretion which accumulates on the apex of the ovules and when dried, it migrates to the ovule of the gymnosperms for fertilization of the ova. This pollen drop is formed in the free nuclear stage of the gametophyte and hence it leads to germination later on.
Additional information:
The embryo is the young developing plant inside the seed which develops as a result of several egg cell divisions. The embryo sac is formed when the haploid megaspore nucleus divides also called megagametophyte. It consists of two haploid nuclei and six haploid cells. It is equivalent to the female gametophyte of lower plants. The ovary is a part of the female reproductive organ in flower. It mainly forms the enlarged basal part of the pistil that holds ovules. The ovary can further develop into fruits either dry or fleshy. The ovary has ovules which on fertilization give rise to seeds. The seed coat is formed from the integuments of the ovule. One of the sperms fertilize the ova in the ovary and form zygote and the other sperm fuses with the two polar bodies and form endosperm, which provides nutrition to the embryo. The embryo is the young developing plant inside the seed which develops as a result of several egg cell divisions. The embryo sac is formed when the haploid megaspore nucleus divides also called megagametophyte. It consists of two haploid nuclei and six haploid cells. It is equivalent to the female gametophyte of lower plants.

Note: Pollination occurs via wind, air, water, or many other ways. The pollen grains are present on the inner sacs of the anther that are produced by meiosis of microspore. The pollination can also be self- pollination.