Root System and Shoot System

Grade 7 · General Science

Semester 1 | Period 2 | Week 8

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Subject: General Science

Semester: 1

Period: 2

Week: 8

School Name:
Teacher’s Name:
Subject: General Science
Grade Level: Grade 7
Date:
Week 8 Lesson Duration: 45 minutes
Week & Period: Week 8, Period 2
Topic: Root System and Shoot System
Sub-topic: Detailed Study of Plant Structures – Root, Stem, Leaves, Flowers, and Fruits

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

  1. Describe the structure and functions of the root system.
  2. Explain the role of the stem in transporting water and food.
  3. Explain the process of photosynthesis in leaves, including the role of chlorophyll and starch production.
  4. Describe the function of flowers and fruits in plant reproduction.

Previous Knowledge
Students already know:
• Basic plant structures: root, stem, leaves, flowers, and fruits.
• General function of roots, stems, and leaves.

Instructional Materials
• Textbook: General science textbooks for Grade 7
• Teaching aids: Plant specimens, diagrams of root and shoot systems, 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:
• What are the main parts of a plant?
• How do roots, stems, and leaves help a plant survive?
The teacher will record their responses on the board.
Teacher’s Role: Guide a short brainstorming session and correct misconceptions.
Learner’s Role:
• Share their prior knowledge about plant structures.
• Respond verbally and participate in the warm-up discussion.

B – Building Knowledge (Main Lesson Body)

Time: 25–30 minutes

Teacher’s Role (Expanded & Detailed)

  1. Explain the Root System
  • Functions:
    • Absorption: Roots take in water and minerals from the soil.
    • Fixation/Anchorage: Roots hold the plant firmly in the soil, preventing it from being washed or blown away.
    • Storage: Some roots also store food for future use (e.g., cassava, yam, carrot).
  • Local Examples in Liberia:
    • Cassava root (food storage, staple crop).
    • Palm tree roots (anchoring against strong winds).
    • Coconut roots (absorbing salty water near the coast).
  1. Describe the Stem
  • Functions:
    • Support: Holds up leaves, flowers, and fruits.
    • Transport: Moves water and minerals from the roots to the leaves and carries food from the leaves to other parts of the plant.
    • Storage: Some stems also store food (e.g., sugarcane, Irish potato tuber).
  • Local Examples:
    • Sugarcane stem (stores sweet juice).
    • Plantain stem (supports bunches of bananas/plantains).
    • Maize stem (supports leaves and cobs, transports nutrients).
  1. Discuss the Leaves
  • Functions:
    • Photosynthesis: Leaves make food using sunlight, water, and carbon dioxide.
    • Chlorophyll: Green pigment in leaves captures sunlight.
    • Food Production: Plants store the food produced as starch.
  • Local Examples:
    • Cassava leaves (used as food in Liberia, also photosynthesize).
    • Potato leaves (used for cooking).
    • Hibiscus leaves (photosynthesis and herbal tea use).
  • Demonstration Idea: Show a green leaf and a dry brown leaf → ask learners: Which can make food? Why?
  1. Explain the Function of Flowers and Fruits
  • Flowers:
    • Reproductive organs of plants.
    • Attract pollinators (bees, butterflies, birds).
    • Produce seeds through fertilization.
  • Fruits:
    • Protect seeds inside.
    • Help in dispersal (by wind, animals, water, or man).
  • Local Examples:
    • Hibiscus flower (bright red, attracts insects).
    • Okra flower and fruit (important food crop).
    • Mango fruit (dispersed by humans and animals).
    • Cotton fruit (wind disperses cotton seeds).
  1. Interconnection of Plant Parts
  • Roots absorb → Stem transports → Leaves make food → Flowers reproduce → Fruits protect and spread seeds.
  • Without roots, plant dries up; without leaves, no food is made; without flowers, no fruits or seeds for continuity.

 

Learners’ Activities (Expanded)

  • Observe real plant specimens: cassava plant (root, stem, leaves), hibiscus flower, mango fruit.
  • Work in pairs or groups: Draw and label a plant, showing root, stem, leaves, flowers, and fruits.
  • Participate in guided discussions: “Why can’t we eat all roots but we can eat cassava roots?”
  • Perform a practical exercise: Place a celery or maize stem in colored water overnight → observe color rising to the leaves (shows transport by stem).
  • Classify a list of plants (teacher-provided) according to which part is useful: root (carrot), stem (sugarcane), leaves (cassava), flowers (hibiscus), fruit (mango).

 

Assessment Checks (Expanded)

  • Oral questioning:
    • What is the main function of the roots?
    • Which plant part carries out photosynthesis?
    • Why is chlorophyll important?
    • Give two examples of fruits found in Liberia that protect seeds.
  • Diagram labeling: Students label the root, stem, leaves, flower, and fruit on a simple plant drawing.
  • Quick activity: Ask students to match plant parts with their uses (e.g., Root → Absorption, Stem → Transport).

 

Notes (Expanded & Detailed)

  • Root system: Essential for absorption, anchoring, and sometimes storage (cassava).
  • Stem: Pathway for water and food transport; supports plant; sometimes stores food (sugarcane).
  • Leaves: Green organs containing chlorophyll; carry out photosynthesis; make starch.
  • Flowers: Reproductive structures; attract pollinators; produce seeds.
  • Fruits: Protect seeds and help in dispersal (e.g., mango, cotton, okra).
  • Interconnection: All plant parts depend on each other—roots supply water, stem transports, leaves produce food, flowers reproduce, and fruits ensure continuation of the species.

 

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

  • Functions of the root system
  • Role of the stem in transport
  • Process of photosynthesis in leaves
  • Role of flowers and fruits in reproduction
    Evaluation Method (Expanded):
    • Exit slip/quiz: Students will write short answers to:
  1. State two functions of roots.
  2. Explain how the stem transports food and water.
  3. Describe the role of chlorophyll in leaves.
    Teacher will collect and quickly review for understanding
    • Provide oral feedback before class ends

Assignment (Expanded): Follow-up Activity:
• Draw and label a plant showing root and shoot systems, and explain the function of each part.
• Observe a plant at home or school and identify its root, stem, leaves, flowers, and fruits.

Differentiation / Inclusive Strategies
• Struggling Learners: Provide simplified diagrams and guided labeling exercises.
• Advanced Learners: Encourage investigation of different types of roots and stems in local plants.
• Students with Disabilities: Use tactile plant models and peer support for hands-on learning.

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