Lesson Notes By Weeks and Term - Junior Secondary School 3

Week: 5

Term: 3^rd Term

Class: Junior Secondary School 3

Age: 14 years

Duration: 40 minutes of 2 periods

Date:

Subject: Agriculture

Topic:-       Asexual propagation  

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Explain asexual propagation
2. State and explain the forms of asexual propagation
3. State the advantages and disadvantages of asexual propagation

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION	TEACHER’S ACTIVITY	STUDENT’S ACTIVITY
STEP 1 INTRODUCTION	The teacher revises the previous lesson on sexual propagation	Students pay attention
STEP 2 EXPLANATION	The teacher explains asexual propagation She states and explains the forms of sexual propagation	Students pay attention and participates
STEP 3 DEMONSTRATION	She states the advantages and disadvantages of asexual propagation	Students pay attention and participate
STEP 4 NOTE TAKING	The teacher writes a summarized note on the board	The students copy the note in their books

 

NOTE

ASEXUAL PROPAGATION

Asexual propagation involves taking a part of one parent plant and causing it to regenerate itself into a new plant. The resulting new plant is genetically identical its parent. Asexual propagation involves the vegetative parts of a plant: stems, roots, or leaves.

 

FORMS OF ASEXUAL PROPAGATION

1. Cuttings – Cutting a portion of a leaf, stem, or root off the parent plant then replanting and therefore the plant begins to grow.  This is the most common and widely used form of vegetative propagation

2. Grafting – Grafting is propagation by combining a scion of one plant and connecting it to the stock of another.  This form of propagation is primarily used with woody plants.  There are many forms of grafts that can be done for many purposes.  A few examples of these grafts are the cleft, tongue, and saddle graft.  An extension of grafting is also known as budding. Budding is the process of taking the bud of one plant and grafting it on to another.
3. Layering – Layering is propagation by means of allowing the plants stolons or runners to root themselves and grow into their own plants.  Common plants that display this type of propagation are the vines and spider plants.  Air-layering is also a common type of layering.  This graft is done on a branch.  The branch is cut open then the opening is surrounded by a soil medium then all this is wrapped with plastic.  Once this is complete, roots should begin to form from the opening after a few weeks.  After roots are mature enough, the branch is severed from the parent plant and place in soil to grow on its own.
4. Division – Division is a less common type of propagation.  This type of propagation is separating a plant through the roots, then replanting the newly separated plants.
5. Budding, is a form of asexual reproduction in which a new individual develops from some generative anatomical point of the parent organism. In some species buds may be produced from almost any point of the body, but in many cases budding is restricted to specialized areas.

 

ADVANTAGES OF ASEXUAL PROPAGATION

1. There is uniformity at maturity
2. it is the only way to propagate plants that don’t have seeds
3. plants start producing fruits early

 

 

DISADVATNAGES OF ASEXUAL PROPAGATION

1. they don’t have a long shelf life
2. it is not possible to produce new varieties of plants
3. budding and grafting requires special skills and handling
4. Viral diseases are easily transmitted to new plants

 

EVALUATION:    1. Define asexual propagation

2. Mention and explain the forms of asexual propagation
3. State the advantages and disadvantages of asexual                    propagation

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively