1. Plant reproduction

2. This lesson will look again at seeds (briefly), why and how they are produced.
It will also look at the other ways plants
have of reproducing.
At the end you should have knowledge
of the ways plants reproduce and be able
to explain some of them.

3. Seeds
Why do plants produce seeds?
So new plants can grow
There are a large variety
of seeds with different
shapes and sizes.

4. How do plants make seeds?
Seeds are produce from sexual reproduction
Many plants produce flowers
Flowers contain female and male sex cells
(ovules and pollen)
Plants use the processes of pollination
and fertilisation to produce seeds.

5. Flowers
What are the names of the flower parts?
anther
petal
stigma
style
ovule
ovary

6. Flowers produce pollen (male sex cells)
in the anther
Flowers produce ovules (female sex cells)
in the ovary
Pollination is the transfer of pollen from the anther to the stigma mainly by wind or insects
Fertilisation is when the nucleus from the
pollen fuses with the nucleus from the ovule
this then develops into a seed

7. The ovary then develops into a fruit.
Fruits come in a wide variety of types.
Seeds are then dispersed away from the
parent plant in many different ways.
Sexual reproduction has many advantages.
What might these be?

8. Plants also reproduce asexually.
This means they do not have to produce
sex cells.
These natural methods of asexual reproduction
include:
tubers, corms, rhizomes, runners and plantlets
Make a note of these and then find out what
each one is and examples of common plants
that reproduce this way.

9. Review the research with the teacher to
make sure everyone understands the
different types of asexual reproduction
and can name some examples.
The next slides will help do this.

10. Tubers
These are
underground
stores of food
with growing
points.
These growing
points produce
new plants the
next year.

11. Corms These are swollen underground stems. The plant stores food for
the next years growth.
Including
Dahlias, Crocus
And Iris

12. Rhizomes
These are modified stems usually underground. They send out roots and shoots from nodes.
They include ferns
water lilies,
ginger and bamboo

13. Runners These are plants that produce small plants from a runner.
They root when they touch the soil.
Including strawberries and spider plants

14. Plantlets These plants grow small plants from established leaves.
Including the mexican hat plant and the piggy back plant