PLANT
REPRODUCTION
Reproduction
 Is the formation of new individuals
 2 types of reproduction:
 Sexual
 Asexual
 Flower has organs of sexual
reproduction
Plant sexual reproduction
5 stages
 Pollination
 Fertilisation
 Seed & fruit formation
 Seed & fruit dispersal
 germination
Sexual reproduction





Involves 2 sex cells joining together
Sex cells are called gametes
Fusion of gametes is called fertilisation
Offspring are not identical to parents
Main advantage: sexual production
introduces variation
Asexual reproduction
 Means new individuals are formed from
only one parent
 Does not involve gametes/sex cells
 Fertilisation does not occur
 Offspring are identical to parents
 This is a major disadvantage
 Plants reproduce by both sexual and
asexual reproduction
Asexual reproduction
Strawberry plants produce special runners
which grow from base of parent
Runner forms new roots and a shoot
New strawberry plants are produced from
original plant
Runners are a method of asexual
reproduction
Other examples of asexual
reprodcution
 Daffodils increase in
number each year
 Spider plants
produce new plants
at the end of
projecting stalks
Other ways of asexual
reproduction
 Cuttings of
geraniums, busy
lizzie or hedges
Sexual reproduction in
plants
 2 parents involved
 Gametes involved
 Offspring different to parent – introduces
variation
Structure of a flower
Flower part
Part function
Petal
Petals are used to attract insects into
the flower, they may have guidelines
on them and be scented.
Stigma
Where pollen grains land.
Style
Connects stigma to ovary.
Ovary
Contains one or more ovules. Each
ovule produces an egg = female
gamete
Ovule
The Ovule is like the egg in animals and once fertilisation
has taken place will become the seed.
Flower
stalk
Gives support to the flower and elevates the flower for the
insects.
Nectary
This is where a sugary solution called nectar is held to attract
insects.
Sepal
Sepals protect the flower whilst the flower is developing from
a bud.
Filament
A stalk that supports the Anther.
Anther
Makes pollen grains which become the male gamete
Carpel structure
Plant germination
Conditions necessary for germination
 Water
 Oxygen
 Suitable temperature
To
investigate
conditions
necessary for
Plant
germination