Fertilisation, Dispersal & Germination

Question 1

The process of fertilisation

Answer 1

1. pollination - pollen grain lands on the stigma. (This could happen with the help of insects or the wind)
2. a pollen tube grows out of the pollen grain and down through the stigma and the style.
3. The pollen tube enters the ovary via a micropyle.
4. The male gamete then passes down the pollen tube and enters the ovary. This is when it fertilises the female gamete cell
5. Once fertilised, the zygote (fertilised egg cell) develops into a seed, while the ovule wall becomes the seed coat, and the ovary becomes the fruit.

Question 2

What is the order of the structures through which the pollen tube grows?

Answer 2

Stigma ➔ style ➔ ovary

Question 3

Following fertilisation, which structure becomes the the seed?

Answer 3

Zygote

Question 4

Following fertilisation, which structure becomes the the fruit?

Answer 4

Ovary