Which of the following animals is produced without fertilization?

Which one of the following operations with flowering plants would be most likely to produce the greatest number of variations in the offspring?

If the chromosome number in cells of integuments is $10$,then what will be the chromosome number in the synergids,definitive nucleus,and antipodal cells in the embryo sac of an angiospermic ovule?

Which plant has the longest pollen tube?

How many meiotic divisions are required to produce $200$ and $400$ seeds in pea plants,respectively?

Give differences: Anther and Ovary.