Question

Pollen-pistil interaction is a dynamic process involving
A. Pollen recognition
B. Promotion of the pollen
C. Inhibition of the pollen
D. All of the above.

Answer 1

Pollen grains are deposited at the stigma both because of closeness of the anthers to the stigma or with the aid of using pollinating agents (biotic or abiotic). This specific function brings approximately interaction among the male gametophyte, the pollen grains, with the massive sporophytic tissue.

Complete answer:
To answer this question, first, we have to know about the pollen-pistil interaction. The pollen are small tiny minute forms representing the male gamete are eliminated from the anther of the flower. These pollens are switched via air, water, bird, animal or insect or another agent to the plant pistil. The pistil contains female reproductive systems known as multiple ovules. The pollen pistil interlinkage is medicated with the aid of using the pollen tube which develops from the pollen grain and it deposited at the stigma of the flower. Its feature is to penetrate the style and launch the male gamete into the ovule to facilitate the fertilization procedure.
Now, let us find the solution from the option.

The pistil has the capability to allow the pollen, whether or not it is self or non-self.
The pollen grain grows at the stigma to supply a pollen tube via one of the germ pores. The contents of the pollen grain flow into the pollen tube. The pollen tube grows via the stigma tissue and style and reaches the ovary.
Pollen tube, after accomplishing the ovary, invades the ovule via the micropyle after which invades one of the synergids via the filiform apparatus.
All the activities from the pollen deposition at the stigma till pollen tubes invade the ovule are called as pollen pistil interlinkage or interconnection. It is a dynamic function involving all the functions which are mentioned above.

Thus, the correct option is D. i.e. All of the above.

Note: Pollen-pistil interlinkage encloses the sequential activities from pollination till the pollen tubes invade the ovules. During this interlinkage the pistil protects the pollen grains. Pollen of different species is inhibited at the extent of pollen germination or pollen tube development within the style.