The pollen viability period of rice and pea respectively,is

What is the number of chromosomes in a meiocyte of a potato plant?

Choose the correct option from the following statements.
$I$. During embryogenesis,the zygote undergoes mitotic cell division.
$II$. In organisms with a diplontic life cycle,the zygote divides by meiotic cell division.
$III$. The pericarp (fruit wall) develops from the ovary wall after fertilization.
$IV$. In brinjal,sepals remain attached to the fruit even after fertilization.

What does the product of sexual reproduction generally generate?

Triticum vulgare has been found to be presently evolved as

Rose plants produce large,attractive bisexual flowers but they seldom produce fruits. On the other hand,a tomato plant produces plenty of fruits though it has small flowers. Analyse the reasons for the failure of fruit formation in roses.