What is double fertilisation? Describe the process giving its significance. Add a note on post-fertilisation changes leading to the formation of seed.

What is double fertilisation? Explain.

Describe double fertilisation and its significance.

What is the significance of double fertilisation?

a) Explain the phenomenon of double fertilization. b) Describe the post-zygotic events leading to implantation and placenta formation in humans. Mention any two functions of placenta.

Assertion : In angiosperms, endosperm development precedes embryo development. Reason : Double fertilisation ensures that the nutritive tissue is formed before the zygotes starts cleaving so that the energy spent on the formation of endosperm does not get wasted.

What is Reynold's number? Give its significance.

What is single cell protein ? Give its source and significance.

Seed formation without fertilisation in flowering plants involves the process of

Rewrite the following in correct order as to be in a logical sequence : Implantation parturition, ovulation, gestation fertilisation (stages leading to formation of foetus and birth).

What is heterospory? Briefly comment on its significance. Give two examples.