Transcript Lesson plan Class 10th Topic: Reproduction In Organisms Sub- Asexual Reproduction In Organisms GENERAL OBJECTIVES • To develop scientific awareness among the students about reproduction in.

Lesson plan
Class 10th
Topic: Reproduction In Organisms
Sub- Asexual Reproduction In Organisms
GENERAL OBJECTIVES
• To develop scientific awareness among the
students about reproduction in living things
• To aware the students about different parts of
organisms related to reproduction.
• Types of reproduction.
• To develop the inter disciplinary approach for
study in different subjects.
• To make the students confident and present
topic in class.
• To make students aware about their
surroundings & environment.
SPECIFIC OBJECTIVES
 To enable the students to know about
asexual reproduction in organism
 To know different modes of asexual
reproduction
 To get the students aware about different
parts of a plant which take part in
asexual reproduction
PREVIOUS KNOWLEDGE TESTING
• See this picture and tell about this
• Parents and children
• How the continuation of race takes
place?
• By Reproduction.
• WHAT IS REPRODUCTION?
• Reproduction is the process of formation of new individuals of its
own kind.
• WHY IS IT IMPORTANT?
• Reproduction is important for the continuation of the race.
• WHAT ARE ITS DIFFERENT TYPES ?
• Two types.
• What are these?
Reproduction
Asexual
Reproduction
Sexual
Reproduction
Do you know what is
Asexual Reproduction?
Well students today we will
discuss about Asexual
Reproduction in organisms
Presentation
Asexual Reproduction


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Asexual reproduction is the formation of
new individuals from single parent
(monoparental)
New individuals are similar to the
parents.
morphologically & genetically similar
organisms known as clone.
How many types of
Asexual Reproduction is?
Types of Asexual Reproduction
Fission
Budding
Regeneration
Spore formation
Fragmentation
Vegetative Propagation
 What do you means by fission?
• Fission means to break down of individual into
two equal parts.
 What are the name of these?
• These are
• 1 Binary Fission
• 2 Multiple Fission
(A)Fission
Binary Fission
Favorable condition.
eg. Protoza (amoeba).
Multiple Fission
unfavorable condition.
eg. Amoeba , Plasmodium.
What are favorable conditions
1.Binary Fission
 Can you give any example of binary fission?
• Yes, Amoeba
• See the pictures and tell how many Amoebas are
produced
• Two
• Amoebas reproduce (make more
amoebas) by a process called binary
fission.
• This means that one amoeba can
split in half and make two identical
new amoebas.
• In this process mitotic nuclear
division followed by cytoplasmic
division
(2) Multiple Fission
What is multiple fission?
• Formation of more than two individuals
under unfavorable conditions .
Can you give an example?
• Yes , Amoeba and Plasmodium
Can you describe this picture?
amoeba
Daughter cells formation
Cyst formation
Division of nucleus
New pseudopodispore or amoebas
What is the name of this fission?
Fragmentation in Spirogyra
(B) Fragmentation
• In multicellular organisms i.e. simple body
organization .body breaks up into two or
more parts .
• But it is not true in all multi cellular
organisms
• i.e. specialized cell are organized and placed
at specific position in the body.
Do you know what these pictures represent?
These pictures show an out growth like structure
Budding In Hydra
Budding- an individual grows out of
the body of the parent.
New organism
Hydra Budding
Cactus Budding
(C) Budding
• Budding- an individual grows out of
the body of the parent.
• Hydra use regenerative cells for
reproduction in the process of
budding
• Outgrowth or Budding is due to
repeated division of cells.
Observe the surface of potatoAB-
………..?
………..?
Potato
How potato reproduces ?
Ans :- By vegetative propagation.
How many types of vegetative
propagation in plants?
Ans :- By roots, stem and leaves.
Vegetative reproduction by Roots
Some plants use their roots for asexual
reproduction. Example: Dahlia
In dahlia each root tuber can form a whole new
plant.
Vegetative reproduction by Leaves
• This photo shows the leaves
of the common ornamental
plant Bryophyllum (also
called Kalanchoë).
• Leaf margins produce tiny
plantlets that fall off and can
take up an independent
existence.
Can plants reproduce by artificial
Vegetative propagation?
Ans:-yes
What is Artificial Vegetative
propagation
Ans:- Propagation by stem cutting and grafting
Artificial Vegetative propagation
Artificial methods used in agriculture &
horticulture to propagate / grow new
plants that are identical to the parent
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Grafting
• Involves fixing /
binding together the
cut surfaces of 2 plants
(similar) so they grow
as one.
• Useful qualities from
both plants combined
into one e.g. rose
flower and thorn-less
stem e.g. apple trees.
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Layering
• A branch of a plant is bent over and pinned
down into the soil at a node.
• It is covered over with soil & eventually new
roots & shoots develop.
• Useful for the propagation of woody plants
e.g. blackberry, gooseberry.
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What is regeneration?
Ans:-formation of new individual.
(E)Regeneration
• Ability to give rise
to new individual
organisms from
their body parts.
eg. Hydra Planaria.
(F) Spore Formation
Unicellular or multicellular, reproductive or distributional cells developing
into a number of different phases of the complex life cycles of the fungi
Latest technology for propagation of
plants in laboratory (Micro- propagation)
• Some cells are removed from
plant are placed in a dish with
nutrients & growth regulators
• They grow into a group of
similar cells called a callus
• Which develops into a small
plant & then placed into
compost.
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(Tissue Culture)
Group Formation
Whole class will be divided into four groups:
Group No. 1 will be given different plants and
show its different parts.
Group No. 2. will be asked to identify the plants
which reproduce asexually with stem.
Group No. 3. will be asked to identify the plants
which reproduce asexually with roots
Group No. 4. will collect the plants which
reproduce through the leaves.
Comment on this crop
Activities
• Collect water from the lake or pond that appear
dark green and contain filamentous structures.
Observe it under microscope in school lab.
• Students will be asked to collect &
identify the Organisms which reproduce
asexually.
Evaluation
 What is reproduction ?
 Define asexual reproduction ?
 Name the parts of a plant by which it can reproduce
asexually.
 Which part of the potato plant we eat?
 Sheela has gone to a garden. She collected roots of Dahlia
over there. She said that plant can not reproduce through
these roots. Are you agree. Explain?
Home Assignments
• Can you think of reason why more complex
organisms can not give rise to new individuals
through regeneration.
• Why asexual reproduction is not so common
in higher animals?
Home assignment
• Make collection of plants which reproduce
through stem in your locality.
• Make list of plants whose roots are used in
your kitchen as vegetable.
• List the ornamental plants which reproduce by
artificial vegetative propagation in your
locality.
Exercise to develop research attitude
among the students
• Students will be asked to visit A garden/
Nursery/ Polyhouse/ Tissue culture lab and
prepare a complete Project report related to
asexual reproduction.
• At the end of vacation they have to present
their project report in the class.
THANK YOU