Reproduction
IN PLANTS
OBJECTIVES
At the end of the lesson students should be able to:
1. Define the term reproduction after class
discussion.
2. List and explain the types of reproduction after
class discussion.
3. Define a flower after power point presentation.
4. Draw and label the parts of a flower.
5. Explain the function of the parts of the flower
after completing assignment.
Plant reproduction
Is the production of new individuals
or offspring in plants, which can be
accomplished by sexual or asexual
reproduction
Sexual (seed)
Asexual (parts of the plant other than
seed)
SEXUAL AND ASEXUAL
REPRODUCTION
Sexual reproduction produce offspring by
the fusion of gametes, resulting in offspring
genetically different from parent or
parents
Asexual reproduction produces new
individuals with fusion of gametes,
genetically identical to parent plant.
Asexual reproduction may occur through
budding, spore formation and vegetative
propagation.
Sexual Reproduction
Flowers of seed plants
contains organs of
reproduction.
Most flowers contains
both Male and female
parts in one flower(guava).
Sexual Reproduction
Other plants produce separate male flowers and
female flowers on the same plant.
MALE and FEMALE FLOWER
Typical Flower
Flower Stalk • Pistel
Pedicel – Stigma (Carpel)
Receptacle – Style
Calyx – ovary
Sepals • Stamens
– Anther
Carolla
– filament
Petals
Diagram of a Typical Flower
Parts of a flower
Style
The style raises the stigma
away from the Ovary to
decrease the likelihood of
pollen contamination. It varies
in length.
Ovary
This protects the ovule and
once fertilization has taken
place it will become the fruit.
Ovule
The Ovule is like the egg in
animals and once fertilization has
taken place will become the
seed.
Pistil/carpel
This is the female part of the
flower consisting of the stigma,
style and ovary.
Flower stalk
Gives support to the flower and
elevates the flower for the
insects.
Stamen
This is the male part of the
flower consisting of the anther
and filament.
Receptacle
This is the flower's attachment
to the stalk and in some cases
becomes part of the fruit
after fertilization e.g.
strawberry.
Sepal
Sepals protect the flower
whilst the flower is developing
from a bud.
Petal
Petals are brightly coloured,
scented and are used to attract
insects into the flower.
Stigma
Is covered in a sticky substance
that the pollen grains will
adhere (stick) to.
Filament
This is the stalk of the Anther.
Anther
The Anthers contain/produce
pollen grains.
The polen sacs release pollen on to the
outside of the anthers that brush
against insects on entering the flowers.
The pollen once deposited on the
insect is transferred to the stigma of
another flower or the same flower. The
ovule is then able to be fertilized.
Flowers that carry both male and
female reproductive structures are
describe as complete flowers.
However, there are some flowers that
carry either the male or the female
reproductive structure and are said to
be incomplete flowers.
END OF
PRESENTATION
Pollination
Transfer of pollen grain from anther to
stigma
Self pollination
Same flower or different flower on
same plant
Cross pollination
Flower of one plant to the flower of
Agents of pollination
Pollination can be brought about by birds, other small animals and
humans.
Main agents are
Wind
Insects
Characteristics of wind & insect
Pollinated flowers
Fertilization
The fusion of a male sex cell (pollen) with a female sex cell (ovule) to
form a zygote.
Seed formation
After fertilization seed formation occurs.
Fertilized egg develops into an embryo.
TRUE AND FALSE FRUITS
If the fruit is only made from ovary, it is a called a
true fruit, e.g. Pods, marrow and tomato. If parts
of the fruit, then it is called a false fruit, e.g.
pineapple, apple, strawberry and rosehips.
FLESHY AND SWEET FRUITS
The ovary wall can thicken and becomes fleshy, e.g.
CLASSWORK
1. What is the function of:
Sepal
Anther
Ovary
2. What is the function of the flower?
3. State the 2 male parts of the flower.
4. State the 3 female parts of the flower.
5. Define the term reproduction.
6. State the two types of reproduction.
7. Explain asexual reproduction.
