Draw a labelled diagram of the flower Identify the male and
female parts of the flower What is the difference between Asexual
Sexual plant reproduction? Name a plant that is produced asexually
and describe how it grows in this way? Explain what is meant by a
Gamete? Name the 2 gametes in plants and where they are
produced.
Slide 3
Slide 4
Slide 5
The Carpel is the name for all the female parts of the flower.
Stigma: The stigma is the place where the pollen grains will land.
Style: Connects the Stigma to the Ovary. Ovary: Contains the
Ovules. Each ovule produces an egg which is the female gamete.
Slide 6
The Stamen contains the male parts of the flower. Anther is the
head of the stamen and where pollen is produced, pollen is the male
gamete The Filament is the tall stalk holding the Anther in place.
Pollination is the transfer of pollen from the Stamen of one plant
to the carpel of another plant.
Slide 7
Asexual Reproduction: New plants are formed only from one
parent Fertilisation is not part of asexual reproduction. In
asexual reproduction the offspring are identical to the
parent.
Slide 8
SexualAsexual Two parentsOne parent Gametes involvedNo gametes
involved Offspring is different to the parents. Offspring is
identical to the parent.
Slide 9
Slide 10
Strawberry plants produce special stems called Runners The
Runners spread along the ground away from the parent plant The
Runners can then develop new roots and a new shoot, forming new
strawberry plants Strawberry plants produced from runners have one
parent and are identical to the parent.
Slide 11
Slide 12
Slide 13
A Gamete is the name for a sex cell. In plants like humans
there are 2 sex cells The Pollen is the male gamete produced in the
Stamen. The egg is the female gamete produced in the ovary (part of
the carpel)
Slide 14
A sex cell is called a Gamete! Sexual reproduction involves 2
Gametes. Fertilisation is the joining of a male gamete and a female
gamete. The offspring are not identical to the parents and share
characteristics of both parents. This is an advantage to the
plants. The flower contains all the parts needed for sexual
reproduction.
Slide 15
Pollination is the transfer of pollen from a stamen to a carpel
The pollen produced in the stamen is transferred to the Stigma (
the top of the carpel)
Slide 16
Slide 17
Wind pollination: The wind carries the pollen from the anther
of one plant to the stigma of another plant. Insect Pollination:
Insects transfer pollen from the anther of one plant to the stigma
of another plant.
Slide 18
What do you think flowers need to have in order for insects to
transfer their pollen to other pants? What do you think flowers
need to have in order for their pollen to be transferred by the
wind?
Slide 19
Insect pollination: Colourful petals are attractive to insects
which also collect a substance called nectar from the flower. Wind
pollination: Do not need to be colourful. Their stamens are loosely
attached to the flower and easily blown away by wind.
Slide 20
The joining of the Male and Female gametes (sex cells) to form
a Zygote (single cell) The Zygote will grow to form a seed which
becomes the new plant. Take down the diagram of Fertilisation from
the board!
Slide 21
Once the pollen arrives at the stigma, a Pollen Tube grows down
to the egg carrying the pollen The egg and pollen can fuse together
to form the Zygote
Slide 22
Once fertilization is complete a Seed forms. A Fruit is formed
from the ovary.
Slide 23
Each seed starts off as a Zygote surrounded by a food supply
(the fruit) The Plumule will from the future shoot of the plant The
Radicle will form the future roots of the plant What is the fruit
formed from??
Slide 24
Slide 25
After fertilization the ovary becomes the fruit. The fruit
contains the seed. The fruit protects the seed before it is
dispersed. Common fruits include apples, oranges, pears etc.
Slide 26
Slide 27
Slide 28
Dispersal is the carrying of the seed as far as possible from
the parent plant. Advantage: the young plant does not need to
compete with the parent plant for scarce resources such as water
and sunlight. The 4 main ways of dispersal are wind, animal, self
and water dispersal!
Slide 29
Involves the fruit bursting open when it is ripe. The seeds are
then flung as far way as possible i.e. peas and beans. Water
Dispersal :Some fruits or seeds are able to float. This allows them
to be carried away by streams, rivers etc.
Slide 30
Germination is the growth of a seed to form a new plant The
conditions necessary for Germination are: 1. Water 2. Oxygen 3. A
suitable temperature (warmth)
Slide 31
The food supply in the seed allows the root and shoot to grow
The roots grow down The shoots grow up towards the sunlight Green
leaves form and the plant begins to make its own food through
Photosynthesis.
Slide 32
Tube A has 5 cress seeds on wet cotton wool and is in a warm
place. This tube is the control can you explain why?? Tube B has 5
cress seeds on dry cotton wool and is in a warm place, what
condition is missing? Tube C has 5 cress seeds covered by boiled,
cooled water and a layer of oil and is in a warm place, what
condition is missing? Why is the water boiled and a layer of oil
placed over it?
Slide 33
Tube D has 5 cress seeds on wet cotton wool and is placed in a
cold place, What condition is missing in tube D? What results do we
expect? Which test-tubes will have seeds that germinate and
why?