Lesson plan Science 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.

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 Sexual Reproduction Asexual Reproduction

Do you know what is Asexual Reproduction?

Well students today we will discuss about Asexual Reproduction in organisms

Presentation Asexual Reproduction 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?

Vegetative Propagation 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 Multiple Fission unfavorable 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

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?

Division of nucleus amoeba Cyst formation Daughter cells formation 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.

Budding In Hydra 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. Hydra Budding New organism 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 potato-

Ans :- By vegetative propagation. 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

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.

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.

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.

(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.

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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.

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