Structure and Function of a Flower

Grade 7 · General Science

Semester 1 | Period 2 | Week 9

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Subject: General Science

Semester: 1

Period: 2

Week: 9

School Name:
Teacher’s Name:
Subject: General Science
Grade Level: Grade 7
Date:
Week 9 Lesson Duration: 45 minutes
Week & Period: Week 9, Period 2
Topic: Structure and Function of a Flower
Sub-topic: Flower Anatomy, Functions, and Elementary Treatment of Growth, Photosynthesis & Reproduction

Learning Objectives
By the end of the lesson, students should be able to:

  1. Identify the main parts of a flower, including stalk, pedicel, and epicalyx.
  2. Describe the structure of the calyx (sepals), corolla (petals), androecium (stamens, anthers, pollen), and gynoecium (ovary, style, stigma).
  3. Explain the functions of each flower part in protection, pollination, and reproduction.
  4. Relate flower structure to basic concepts of plant growth, photosynthesis, and reproduction.

Previous Knowledge
Students already know:
• Basic plant structures: roots, stems, leaves, flowers, and fruits.
• Function of leaves in photosynthesis and basic reproduction in plants.

Instructional Materials
• Textbook: General science textbooks for Grade 7
• Teaching aids: Flower specimens, diagrams of flower anatomy, charts showing photosynthesis and plant reproduction
• Students' notebooks and writing materials

Lesson Development – ABC Model

A – Anticipation (Warm-up / Starter)
Time: 5–10 minutes
Activity: The teacher will ask the class:
• Can you name the parts of a flower you have seen before?
• Why do you think flowers are important to plants?
The teacher will record their responses on the board.
Teacher’s Role: Guide a short brainstorming session and correct misconceptions.
Learner’s Role:
• Share prior knowledge about flowers and their role in reproduction.
• Participate verbally in the warm-up discussion.

B – Building Knowledge (Main Lesson Body)

Time: 25–30 minutes

Teacher’s Role (Expanded & Detailed)

  1. Introduce the Flower and Its Supporting Structures
  • Begin by showing a real flower specimen (e.g., hibiscus, okra, or pawpaw flower from Liberia).
  • Point out the flower stalk (peduncle) – attaches the flower to the stem.
  • Show the pedicels – tiny stalks of individual flowers in a cluster.
  • Mention the epicalyx – an extra whorl (found in flowers like hibiscus) that helps in protecting the bud.
  1. Explain the Calyx (Sepals)
  • Describe as green, leaf-like structures that enclose and protect the young flower bud.
  • Function: protection before blooming and sometimes photosynthesis (since they are green).
  • Local Example: In hibiscus flowers, sepals protect the red petals before they open.
  1. Explain the Corolla (Petals)
  • Show the colorful part of the flower.
  • Functions:
    • Attracts pollinators like bees, butterflies, and birds through bright colors and scent.
    • Provides a landing platform for insects.
  • Local Example: Hibiscus petals (bright red, attract butterflies), okra petals (pale yellow, attract bees).
  1. Describe the Androecium (Male Reproductive Part)
  • Consists of stamens: each has a filament (stalk) and an anther.
  • The anther produces pollen grains (male reproductive cells).
  • Function: to produce and release pollen for fertilization.
  • Demonstration: Tap a hibiscus anther gently → show yellow pollen on fingers.
  1. Describe the Gynoecium (Female Reproductive Part)
  • Central structure of the flower.
  • Made up of:
    • Ovary – contains ovules (female reproductive cells).
    • Style – tube that connects the ovary to the stigma.
    • Stigma – sticky surface that receives pollen.
  • Function: receives pollen and enables fertilization, leading to seed and fruit formation.
  • Local Example: In okra flower, fertilization produces okra pods; in mango flower, it leads to mango fruits.
  1. Explain Functions of Each Part in Protection, Pollination, and Reproduction
  • Sepals protect → Petals attract → Stamens produce pollen → Gynoecium receives pollen → Fertilization occurs → Fruit and seed form.
  • Connect to plant growth: Food made in leaves supports the development of flowers and fruits.
  1. Use Local Examples for Demonstration
  • Hibiscus flower: has clear sepals, petals, stamens, and stigma.
  • Okra flower: shows how flowers turn into edible fruits.
  • Mango flowers: small but important for fruit production.

 

Learners’ Activities (Expanded)

  • Observation: Examine real flowers (provided by teacher or brought by students).
  • Labeling exercise: Work in groups to label a diagram of a hibiscus flower.
  • Discussion: Answer guided questions like: Why do flowers have bright colors? What would happen if a flower had no stigma?
  • Hands-on task: Dissect a flower and separate sepals, petals, stamens, and pistil.

 

Assessment Checks (Expanded)

  • Oral questions:
    • What is the role of sepals?
    • Which part of the flower produces pollen?
    • Where does fertilization take place?
  • Diagram labeling: Give a flower diagram with missing labels for learners to complete.
  • Practical identification: Ask students to point to parts of a real hibiscus or okra flower.
  • Short group activity: Learners classify flower parts into protective, attractive, or reproductive.

 

Notes (Expanded & Detailed)

  • Flowers are essential for plant reproduction → they produce seeds and fruits.
  • The calyx protects; the corolla attracts pollinators; the androecium produces pollen; the gynoecium receives pollen and develops seeds and fruits.
  • Flowers are important for human food supply because they give us fruits (mango, orange, pawpaw) and seeds (okra, beans, maize).
  • Photosynthesis in leaves supports flower and fruit development by providing food and energy.
  • In Liberia, flowers of plants like hibiscus, mango, okra, and pawpaw play major roles in both reproduction and food production.

 

C – Consolidation (Conclusion & Assessment)
Time: 5–10 minutes
Summary:
• The teacher will ask the students to recall:

  • Structure of the flower and its parts
  • Functions of calyx, corolla, androecium, and gynoecium
  • Relationship of flowers to growth, photosynthesis, and reproduction
    Evaluation Method (Expanded):
    • Exit slip/quiz: Students will write short answers to:
  1. Name two parts of the androecium and their functions.
  2. State the function of the calyx and corolla.
  3. Explain briefly how flowers contribute to reproduction.
    Teacher will collect and quickly review for understanding
    • Provide oral feedback before class ends

Assignment (Expanded): Follow-up Activity:
• Collect a flower from home or school, dissect it carefully, and label all its parts in your notebook.
• Explain the role of each part in reproduction.

Differentiation / Inclusive Strategies
• Struggling Learners: Provide labeled diagrams and step-by-step guidance for flower dissection.
• Advanced Learners: Encourage observation of pollination processes in local plants.
• Students with Disabilities: Use tactile flower models and peer assistance for hands-on learning.

Teacher’s Reflection (After Class)
• What worked well? ______________________________________________________
• What needs improvement? _________________________________________________
• Students’ engagement level: □ High □ Medium □ Low