Fertilisation in Plants

Question 1

When pollen lands on a stigma:

Answer 1

1)A tube called a pollen tube grows out and extends down through the flower’s style towards the ovary.
2)A nucleus from the pollen grain moves down this tube to meet a nucleus in the female gamete (in an ovule inside the ovary).
3)The male and female nuclei fuse together in a process called fertilisation, allowing genetic material to combine.

Question 2

After an egg cell is fertilised:

Answer 2

1)The ovule matures into a seed containing an embryo plant and food supply.
2)The food store provides nutrients to the embryo when the seed germinates.
3)The ovary develops into a fruit around each seed.

Question 3

Methods of Seed Dispersal

Answer 3

1) Wind - Blows seeds away e.g. dandelions, sycamores.
2) Animals - Seeds excreted after fruits are eaten or seeds stick to fur e.g. blackberries.
3) Explosions - Seed pods burst open flinging out seeds e.g. peas.
4) Gravity - Fruits fall and roll away e.g. conkers.

Question 4

Define Seed Dispersal

Answer 4

When seeds are transported from the plant to another area in order to grow. It happens to decrease competition for resources such as sunlight, water, sunlight, and carbon dioxide