BIOLOGY LESSON NOTE ON CROP PROPAGATION

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Topic: Crop Propagation Class: Senior Secondary School 2 (SS2) Subject: Biology Specific Objectives By the end of this lesson, students should be able to: Define crop propagation. Differentiate between sexual and asexual propagation. Identify and explain various methods of crop propagation. Highlight the advantages and disadvantages of each method. Recognize common examples of crops propagated using each method. Lesson Content 1. Meaning of Crop Propagation Crop propagation refers to the process by which plants reproduce or are reproduced to give rise to new plants. This can occur naturally or be carried out artificially by farmers or agricultural scientists. It is a vital practice in agriculture that ensures the continuous production of food and other plant-based resources. 2. Types of Crop Propagation Crop propagation is broadly categorized into two main types: Sexual Propagation (Seed Propagation) Asexual Propagation (Vegetative Propagation) 3. Sexual Propa...
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BIOLOGY LESSON NOTE ON DECOMPOSERS

 TOPIC: Decomposers

MAIN AIM: To help the learner understand the concept of decomposing 

SUBSIDIARY AIM: By the end of the lesson, learners should be able to:

  1. Define Decomposers 
  2. List the Classes of decomposers
  3. Explain the Process of Decomposition
  4. State the Role of Decomposers in Ecosystem

PERSONAL AIM: To keep strictly to time allotted to each stage of the lesson.

TEACHING AIDS: Pictures of a decomposer

PREVIOUS KNOWLEDGE: The students have learnt the concept of nutrient cycling in their previous lessons.

PROCEDURE: The teacher presents the lesson with the following steps.

INTRODUCTION: Displays the picture of a bacterium.

STEP 1: Definition of Decomposers

Decomposers are organism responsible for the breaking down of dead organic materials which could be of plant or animal origin. Example, bacteria and saprophytes

Picture of a decomposer showing fungi and bacterium

Pictures of Decomposers 

STEP: Classes of decomposers 

Micro decomposers: They are small microscopic organism that    can cause decay e.g certain bacteria and fungi.

Macro decomposers:  Decomposers are organism responsible for the breaking down of dead organic materials which could be of plant or animal origin. Example, bacteria and saprophytes

STEP 3: Process of Decomposition

The decomposers secrets enzymes onto their food source such as a decaying plant. These enzymes break down complex organic compounds (food) like carbohydrate and protein into simple soluble inorganic compound. The decomposer only absorbs small amount of nutrient and energy for their use. The rest is released into the soil, air and water. The nutrients released are used by plants to manufacture their food.

STEP 4: Role of Decomposers in Ecosystem

  1. Decomposers play major roles in the ecosystem in the following ways.
  2. They enrich the soil with nutrient required for plant growth.
  3. They contribute to environment pollution.
  4. Decomposition is useful in the making of cheese and yoghourt
  5. They allow the ecosystem to function by enabling the recycling of nutrients
  6. They also prevent an unsightly accumulation of remains and wastes of lying organisms on earth surface.

Evaluation 

  1. Define Decomposers 
  2. List the Classes of decomposers
  3. Explain the Process of Decomposition
  4. State the Role of Decomposers in Ecosystem

Conclusion: Decomposers are organism responsible for the breaking down of dead organic materials which could be of plant or animal origin. Example, bacteria and saprophytes.

Assignment

  1. Define decomposers
  2. Explain the process of decomposition

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