Lesson Notes By Weeks and Term - Senior Secondary 1

Reproduction in insects

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TERM – 3RD TERM

WEEK NINE

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Biology

Topic: Reproduction in insects

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

  1. Define metamorphosis
  2. Identify two types of metamorphosis
  3. Describe the lifecycle of a cockroach
  4. Describe the lifecycle of housefly
  5. Discuss the lifecycle of a snail

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

ACTIVITY5

STEP 1

INTRODUCTION

The teacher introduces metamorphosis and explain the two types of metamorphosis

 

Students pay

attention

STEP 2

EXPLANATION

Teacher discusses the lifecycle of a housefly, cockroach and a snail.

Students pay

attention and

participate

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

 

The students

copy the note in

their books

 

NOTE

REPRODUCTION IN INSECTS

Metamorphosis

Metamorphosis refers to a profound transformation or change in form, structure, or character. In biology, it often describes the process of an organism undergoing distinct stages of development, such as a caterpillar transforming into a butterfly.

Types of metamorphosis

There are two main types of metamorphosis in the context of biological development:

  1. Incomplete Metamorphosis: Here Insects undergo three stages: egg, nymph, and adult. The nymph resembles a miniature version of the adult and goes through several molts before reaching adulthood. Examples include grasshoppers and dragonflies.
  2. Complete Metamorphosis: Here Insects undergo four distinct stages: egg, larva (caterpillar), pupa (chrysalis), and adult. The larval stage looks completely different from the adult, and a pupal stage involves a transformative process. Examples include butterflies, beetles, and flies.

Lifecycle of a cockroach

The lifecycle of a cockroach undergoes incomplete metamorphosis and consists of three main stages:

  1. Egg Stage:

   - Female cockroaches lay eggs in protective cases called oothecae.

   - The ootheca contains multiple eggs and is often hidden in a sheltered location.

   - The eggs hatch into nymphs within the ootheca.

  1. Nymph Stage:

   - Nymphs emerge from the ootheca and resemble miniature versions of adult cockroaches.

   - They go through several molts, shedding their exoskeleton as they grow.

   - Nymphs are active and gradually develop into adult cockroaches.

  1. Adult Stage:

   - After reaching maturity through the nymph stages, cockroaches become adults.

   - Adult cockroaches have wings (though not all species fly) and are capable of reproducing.

   - The cycle repeats as adult cockroaches mate, and females produce new oothecae, starting the process anew.

Lifecycle of a housefly

The housefly undergoes a complete metamorphosis with four stages: egg, larva (maggot), pupa, and adult. After hatching from eggs, larvae feed on organic matter, then pupate before emerging as adult flies, completing the life cycle.

Lifecycle of snail

A snail's lifecycle typically involves hatching from an egg, progressing through a series of developmental stages as a juvenile, reaching maturity, and reproducing by laying eggs. The cycle then repeats.


EVALUATION: 1. Define metamorphosis

  1. Mention and discuss the two types of metamorphosis
  2. Discuss the lifecycle of a housefly

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively