Plants and Their Parts: Mechanism
≈ 24 minMechanism
Follow the mechanism step by step and distinguish what causes the change from what is merely observed.
This extension applies that lens specifically to Plants and Their Parts.
A plant is built from parts, and each part has its own job:
| Part | Its job |
|---|---|
| Roots | Hold the plant firmly in the soil and take in water |
| Stem | Holds the plant up and carries water up to the leaves |
| Leaves | Catch sunlight and make food for the plant |
| Flower | Makes seeds that grow into new plants |
Work from the ground up: roots drink, the stem carries, the leaves make food, and the flower makes the next generation.
Worked example. Look at a pumpkin plant on a farm in Limpopo. Its roots grip the soil and sip up water. A long stem creeps along the ground. Wide green leaves sit in the sun making food. Yellow flowers appear, and each one can grow into a pumpkin full of seeds — the start of new pumpkin plants.
Natural Sciences — Grade 4 — Mechanism: Which part of a plant takes in water from the soil?
Natural Sciences — Grade 4 — Mechanism: Which part of a plant catches sunlight and makes food?
Natural Sciences — Grade 4 — Mechanism: What is the main job of a flower?
Name the original topic being extended by this mechanism lesson.
Which statement is the best evidence-led starting point for Plants and Their Parts: Mechanism?