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Plant Growth

BTEC Level 2 Horticulture
by

Peter Fearon

on 14 November 2013

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Transcript of Plant Growth

Reproduction in Plants
Learning Objective
To understand how plants reproduce.
Plants can reproduce in one of two ways:
sexual reproduction
asexual reproduction
The reproductive organs of the plant are found in the flower.
Sexual Reproduction
Asexual Reproduction
Asexual reproduction needs only one parent, unlike sexual reproduction, which needs two parents.
There is
no
fusion of gametes and
no
mixing of genetic information. As a result, the offspring are genetically identical to the parent and to each other. They are
clones.
Tubers
are food storage organs that later develop into the following year's plants.
Some plants produce side branches with plantlets on them. The
spider plant
, Chlorophytum, does this. Other plants, such as
strawberries
, produce
runners
with plantlets on them.
Sexual reproduction
involves creation of a new individual produced by the combining features or genes from
two parents
.
The flower structure is made up of pollen producing male part known as
stamen
, and female part called
pistil
that contains the ovary and eggs.
Pollination
is the process that starts the sexual reproducing mechanism.
Pollination of a plant can happen in a number of ways:
wind
insect
self
(this is a form of
asexual reproduction
)
The results of sexual reproduction, are the production of seeds.
Plants need to spread their seeds as far as possible and have evolved a number of ways to do this:
Wind
Animals
Water
Bursting
Humans
Some plants will self pollinate themselves - this means that there is a fusion of sex cells, but both sex cells are from
one
parent.
Vegetative Propagation
In vegetative propagation, new plants grow from parts of the parent plant.
STEMS
ROOTS
New plants will grow out of swollen, modified roots called
tubers
. Buds develop at the base of the stem and then grow into new plants.
Potatoes are an example of a plant that reproduces in this way.
BULBS
ROOTS
STEMS
A bulb contains an
underground stem
. Leaves are attached to the stem. These leaves contain much
stored food
. At the centre of the bulb is an apical bud.
Also attached are lateral buds. The apical bud will produce leaves and a flower while the lateral buds will produce new shoots. As the plant grows and develops it will form a new bulb underground.
BULBS
Daffodils are an example of plants that reproduce in this way.
TASK 1
You need to produce a fact sheet explaining how plants reproduce, including:
Labeled structure of flower diagram
Diagrams of pollination with explanations
Diagrams of seed dispersal with explanations
A summary of asexual and sexual reproduction
An explanation of vegetative propagation with labeled diagrams.
P5
Full transcript