1. The endosperm will have 30 chromosomes and the embryo will have 20 chromosomes.
2. The meiocyte is a diploid cell (with 20 chromosomes) and it undergoes meiosis; hence, the haploid cells of maize will have 10 chromosomes.
3. The endosperm develops from the primary endosperm cell, where the primary endosperm nucleus (PEN) is formed by triple fusion, i.e., fusion of three haploid nuclei-two polar nuclei (fuse to form a diploid secondary nucleus) and a haploid male gamete.
4. So the endosperm cells are triploid with 30 chromosomes.
5. The embryo develops from the zygote, which is formed by the fusion of a female gamete with a male gamete; so it is diploid with 20 chromosomes.

Vivipary is defined as the seed germination, while the fruit is still attached to the mother plant. Plants which grow in marshy places are called mangroves. In these plants when seeds fall on marshy places, they cannot germinate because of high salinity and more water conditions.
So, in those plants, seeds germinate when they are still attached to the mother plant. Litter is the offspring at one birth of animal usually 3-8 in number. Vivipary automatically limits the number of offspring in litter due to the reason that limited number of egg or ovum are produced and fertilised during reproductive cycle of female.

While planning for an artificial hybridisation programme for crop improvement involving dioecious plants, there is no need of emasculation. Dioecious plants have both the male and female reproductive organs borne on separate individuals of the same species.
If the female parent produces unisexual flowers, emasculation is not required. The female flower buds are bagged before the flowers open. When the stigma becomes receptive, pollination is carried out using the desired pollen and the flower is rebagged. This protects them from contamination by unwanted pollen grains.

i) Yes, a plant flowering in Mumbai can be pollinated by pollen grains of the same species growing in New Delhi. It is mainly possible due to artificial hybridisation. In this the pollens are collected from the source plant in Mumbai and dusted on the emasculated flower growing in New Delhi.
(i) The parts involved in transferring the male gametes to their desired destination are stigma, style, micropyle, filiform apparatus and synergids. For LS of post-pollinated pistil

A-Orthotropous ovule
B-Anatropous ovule
C-Hemianatropous 
D-Campylotropous ovule
E-Amphitropous ovule
F-Circinotropous ovule