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Consider the following statements regarding Xenia and choose the correct answer:
1. If a white variety (yy) is pollinated with pollen from a yellow variety (YY), one of the male gametes (Y) will unite with the egg (y) to produce a hybrid embryo (Yy) which will act as a heterozygote for yellow endosperm in the next generation
2. The second male gamete (Y) will unite with the two polar nuclei (y, y) and produces the primary endosperm nucleus (Yyy) which is triploid
3. If a yellow endosperm variety (YY) is crossed with pollen from a white grained variety, the grains produced are white like the pollen parent
Consider the following statements regarding double fertilization and choose the correct answer:
1. At the time of the sperm's approach to the egg nucleus, the male nucleus has the appearance of a continuous thread rolled into a ball
2. It is only the presence of the two nucleoli which serves to distinguish the fertilized egg from the unfertilized egg
3. Finally, the male nucleolus increases in size and fuses with the female nucleolus thus closing the phenomenon of sexual union of the nuclei
4. The fusion of the male gamete with the secondary nucleus results in the formation of a sister embryo
Consider the following statements and choose the correct answer:
1. For the development of viable seeds the double fertilization is very necessary
2. The net result of double fertilization is the formation of endosperm from the triploid nucleus
3. In Angiosperms very free nuclear divisions take place as in Gymnosperms
4. The endosperm nucleus has both maternal and paternal characters showing physiological importance like hybrid vigour
Endosperm of angiosperms is produced after fertilization ora male gamete with
In double fertilization, male gamete and secondary nucleus form
Upon self-fertilization of Aa with itself, the probability of A gamete fusing A and a gamete is equal.
A diploid male angiospermic plant is crossed with tetraploid female plant. Endosperm of seed will be
During the sexual reproduction in algae, the fusion of one large, nonmotile female gamete and a smaller, motile male gamete is called as:
In which of the following types of endosperm, the first nuclear division of the primary endosperm nucleus is followed by the formation of either a longitudinal or transverse wall in the central cell?
Which among the following is correct regarding male-female inter and intra-state migration in India as per Census-2011 data? 1. In intra-state migration, male outnumbers female in rural to urban migration 2. In inter-state migration, male outnumbers female in rural to urban migration 3. In intra-state migration, female outnumbers male in rural to rural migration 4. In inter-state migration, male outnumbers female in rural to rural migration