Question

Very short answer type:
Mention any two characteristics of the pollen grains of maize.

Answer 1

Hint: Pollen can be defined as a fine substance composed of male microgametophytes from seed plants which produce male gametes (sperm cells). Pollen grains have a tough sporopollenin coat which protects gametophyte from the pistil of blooms or the male cone of coniferous plants during their transition.

Complete answer:
The pollen grains are smooth-walled, light, small, and dry, allowing them to be easily passed up wind.
Pollens are usually having less nutritional value.
The pollen of maize is anemophilous.
The exchange of pollen grains from an anther to the stigma of the pistil is fertilisation.
(i) Autogamy is defined as the exchange of dust grains from an anther to the disgrace of a similar blossom. Anthers and shame are close enough together that self-fertilization occurs, as in cleistogamous blossoms, which produce guaranteed seed-set even in the absence of pollinators.
(ii) Geitonogamy is the transfer of dust grains from an anther to another blossom of the same plant. It is hereditary, like autogamy, but it also includes cross-fertilization.
(iii) Xenogamy is the transfer of dust grains from an anther to the disgrace of a different plant bloom.

Note:
If pollen falls on a viable pistil or female cone, it develops, delivering a dust tube that transports the sperm to the ovule containing the female gametophyte. Singular dust grains are sufficiently small to warrant amplification in order to see detail. The study of pollen is known as palynology, and it is extremely useful in paleoecology, fossil science, prehistoric studies, and criminology. Pollen is used to move the haploid male heritage from the anther of a single flower to one another’s stigma during cross-pollination. In a self-fertilization situation, this interaction occurs from the anther of a flower to the stigma of a similar flower.