Transcript asexual - Elgin Academy

Asexual reproduction and
comparison
Learning intentions
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I can describe methods of asexual
reproduction in plants
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I can explain the meaning of the term clone
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I can describe the advantages and
disadvantages of both sexual and asexual
reproduction into plants
Success criteria
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I can describe methods of asexual plant reproduction
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I can identify methods of asexual reproduction looking at different
plant types
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I can define the term clone
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I can complete a table to compare the advantages and
disadvantages of asexual and sexual reproduction
Plant Life Cycles
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All stages involved in plant reproduction take
place continually year after year.
Some plants can reproduce WITHOUT
forming seeds.
This is another form of reproduction
It only involves one parent
No sex cells are involved
It is called ASEXUAL reproduction
Plant Life Cycles – Asexual Reproduction
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During asexual
reproduction the parent
plant produces new
cells which eventually
separate and become
new independent
plants.
Bulbs
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A bulb is made up of
several swollen leaf
bases with stored food
side buds form in the
leaf bases and develop
into daughter bulbs
which will grow into
new plants
Runners
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Some plants grow side
shoots called runners
which form buds along
the stem. They get
nutrients and water
from their parent until
they grow their own
roots and detach.
Strawberry and spider
plants reproduce
asexually using this
method
Tubers
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Some plant reproduce
asexually by producing
underground storage
organs called tubers.
These tubers grow into
new plants the following
year
Offsets
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An offset is a tiny
plantlet that develops
as a side shoot at the
base of a plant. Several
can form a clump at the
base of a parent plant.
Some examples are
Mother in Laws tongue
and Aloe vera
Plantlets
The “Mexican Hat”
Plant produces
plantlets around the
edge of the leaves.
These eventually fall
off and develop into
new independent
plants.
Asexual Reproduction
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Asexual reproduction is quite common in
plants
It produces new plants with the same
characteristics as the parent.
There is no variation
If the plant is resistant to a particular disease,
then so will the offspring.
Asexual Reproduction
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Plants produced in this way are often
found growing in clumps to reduce
competition from other plants.
Growth occurs very quickly because of
available food store.
It is successful as it does not involve the
vulnerable stages of germination and early
seedling growth.
Plants which are all identical, formed in
this way are called a CLONE
Sexual & Asexual Reproduction
There are some important differences between these 2 methods
of reproduction. Each method has advantages and
disadvantages.
Advantages
Disadvantages
Asexual
Sexual
Early quick growth
Reduced competition
Variety
Seeds dispersed
Overcrowding
Quality doesn’t improve &
weaknesses passed on
Gametes required
Limited food store in
seeds