Fertilisation and germination
Fertilisation in a plant
- After pollination, fertilisation joins a pollen nucleus with a nucleus in an ovule.
- (Supplement) First a pollen tube grows down the style into the ovary, carrying the pollen nucleus to the ovule.
Practice
How does the pollen nucleus reach the ovule?
A pollen tube grows from the pollen grain down the style into the ovary, carrying the pollen nucleus to the ovule.
Practice
Fertilisation in a plant is the fusion of a pollen nucleus with a nucleus in an ovule.
Fertilisation joins the pollen nucleus and the ovule nucleus; the ovule then becomes a seed.
Germination
- A seed will only germinate (begin to grow) when it has three things:
- water,
- oxygen,
- a suitable temperature.
Practice
A seed needs which conditions to germinate? (Choose all that apply.)
Germination needs water, oxygen and a suitable temperature; light is not required for germination itself.
You've got it
Key idea
- fertilisation = a pollen nucleus fuses with an ovule nucleus
- (Supplement) a pollen tube grows down the style to deliver the nucleus
- a seed germinates only with water, oxygen and a suitable temperature