Plant Reproduction

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					Plant Reproduction

By
Mr. A. Rogan
Plant Reproduction
Asexual Reproduction:
No Gametes
Only one parent needed
New organism genetically identical
 to parent
Plants and bacteria reproduce this
 way
Plant Reproduction
Sexual Reproduction:
Male and Female Gametes
 involved
Two parents are needed
New organism will not be
 genetically identical to either
 parent
Plant Reproduction

The Flower:
The flower is the part
 of a plant that is
 involved in sexual
 reproduction
Plant Reproduction

The Parts Of The Flower:
Sepals
Petals
Carpel
Stamen
Plant Reproduction

Sepal:
Green leaves which protect
 the flower when it is a bud
Petals:
Attract insects to the flower
Plant Reproduction
The Stamen:
Male Part of the flower
Filament – stalk part of
 stamen
Anther – Small bag on top of
 the filament contains pollen
Plant Reproduction
Structure of the Carpel:
Stigma – Pollen grains land here
Style – Connects stigma to the
 ovary
Ovary – Contains ovules
Ovules – Contain female gametes -
 eggs
Plant Reproduction
Stages in Sexual
 Reproduction in Plants:
Pollination
Fertilisation and Seed
 Formation
Seed Dispersal
Germination
Plant Reproduction
Pollination:
Happens when pollen from one
 flower is transferred to another
 flower of the same species
Insect Pollination or Wind
 Pollination
Plant Reproduction
Insect Pollination:
Petals are bright and perfumed.
Insect rub against Anther and
 pollen gets stuck to them
Insect move to another plant of
 same species and pollen sticks to
 sticky stigma
Plant Reproduction
 Wind Pollination:
 The flowers have long anthers which
  hang outside the flower.
 Pollen is blown out of the anthers by
  the wind
 The stigma of a wind-pollinated flower
  is very large and feathery – able to
  catch pollen
Plant Reproduction
 Fertilisation and Seed Formation:
 After pollination, pollen tube develops
  out of the pollen grain and into the style,
 It then enters the ovule and male gamete
  travels down to join with the egg –
  zygote
 The zygote then becomes the seed.
 The ovary will turn into the fruit
Plant Reproduction
 Dispersal Of The Seed:
 The major function of the fruit is to
  scatter the seed of the plant
 Animal Dispersal
 Wind Dispersal
 Water Dispersal
 Self Dispersal
Plant Reproduction
Animal Dispersal:
Edible Fruits: Animal eats
 fruit and eventually passes
 the seed in its droppings, if
 seed falls in right place it will
 grow into new plant
Plant Reproduction
Animal Dispersal: Contd
Hooked Fruits: Fruits have
 tiny hooks on their surface,
 sticks to the animals,
 eventually fruit will be
 knocked off the animal.
Plant Reproduction
Wind Dispersal:
The wind provides a very
 effective method of carrying
 fruit away from the parent plant
Dandelion uses parachute
Sycamore tree uses winged
 fruits
Plant Reproduction
Water Dispersal:
The water lily is an example
 of a plant with fruits that can
 float.
Water currents carry the fruit
 away, with the seeds inside
Plant Reproduction
Self Dispersal:
The gorse plant can scatter its
 own seed. In summer the plant
 dries out and suddenly bursts.
The seeds shoot out from the
 fruit, and may land some
 distance from the parent plant
Plant Reproduction
Germination:
Plumule – Will form shoot of plant
Radicle – Will become the root of
 the plant
Testa – Protects the seed
Food Store – Provides nourishment
 for the young plant
Plant Reproduction

Conditions Necessary For
 Germination:
Water
Oxygen
Warmth

				
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posted:3/10/2012
language:English
pages:21