The number of meiotic divisions required to produce $40$ seeds in $Capsella$ is:

Which of the following organisms reproduces only once in its lifetime?

Give the differences between Microsporangium and Megasporangium.

In anther culture,some diploid plants were reported along with haploids. They have evolved from:

Choose the correct option ($T$ = true,$F$ = false).
- If zygote develops outside the body,the animal is oviparous.
- In flowering plants,zygote is formed inside the ovule.
- During embryogenesis,embryo shows both cell division and cell differentiation.
- In flowering plants,the ovary develops into the fruit.

What is the ratio of equational divisions that take place in Cycas and angiosperms respectively,leading to the formation of male gametes from pollen grains?