FRAGMENTATION ASEXUAL REPRODUCTION. Pieces from the parent break off and form a new organism...

FRAGMENTATION

ASEXUAL REPRODUCTION

Pieces from the parent break off and form a new organism identical to the original parent

The mature organism breaks up into two or more pieces or fragments. The

fragments then grow into complete organisms.

The fragments regenerate to form an entire individual.

It takes place in some lower plants and animals such as some

worm, starfish and planaria.

Now pay attention to these pictures!!

Could you describe what happened…

Now observe this!!

The end

Could you complete this one?

VEGETATIVE PROPAGATION

Through asexual reproduction, many plants can produce genetically identical offshoots (clones) of themselves, which then develop into

independent plants.

The plants can reproduce by fragmentation, but also by vegetative propagation, this includes the production of specialized

structures such as tubers, runners, and bulbs.

The following plant reproduce by vegetative

propagation:

1. rahyd 2. nooni 3. pustli

4. rybsarwrte 5. subret

Match them with each drawing.

Tubers

Tubers, such as potatoes, are fleshy underground storage structures

composed of enlarged parts of the stem.

A tuber functions in asexual propagation as a result of the tiny scale leaves equipped

with buds that grow on its surface. Each of these buds can form a new plant, genetically identical to the parent.

Runners or Stolons such as those found on strawberry

plants, are slender horizontal stems that spread outward from

the main plant

Entirely new plants can develop from nodes located at intervals on

the runners; each node can give rise to new roots and shoots.

Bulbs Bulbs, such as onions and tulips, are roughly spherical underground buds

with fleshy leaves short stems.

Extending from their each bulb contains several other buds which can give rise to new plants.

Many plants can reproduce this way naturally, but vegetative propagation can also be artificially induced.

This is especially important for commercial growers who want to reproduce the highest-quality plants and ensure consistency of a variety of plant or crop for sale.

“Adva

ntage

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The advantages to this kind of asexual reproduction:

It can occur more rapidly than seed propagation and can allow a

genetically superior plant to produce unlimited copies of itself

without variation.

The main disadvantage is the potential to impact on biodiversity of a species.

Also, if a particular plant clone is susceptible to certain diseases, there is

potential to lose entire crops

Watch this video!!

https://www.youtube.com/watch?v=3O7icCqFfEo

Answer the following questions:

1. Could you mention daily foods that you eat that reproduce by vegetative propagation?

2.This kind of reproduction is natural or atificial? Are there any differences? Explain

them.

3. The plants reproduce asexually, are they equal? Different? Why?

http://www.sciencelearn.org.nz/Innovation/Innovation-Stories/Zealong-Tea/Articles/Vegetative-plant-propagation

http://education-portal.com/academy/lesson/asexual-plant-reproduction-vegetative-propagation-and-bulbs.html#lesson