Year 8 Science · Unit 1 · Lesson 7
Apply Worksheet
Learning Goals
Order the steps
Number the events from 1 to 7 to show the correct order. Event 1 = what happens first.
| Order | Event |
|---|---|
| Water vapour exits through open stomata on the leaf surface | |
| Root hair cells absorb water from the surrounding soil by osmosis | |
| The tension created in the leaf pulls the water column upward through xylem vessels | |
| Water molecules evaporate from the wet cell walls inside the leaf (spongy mesophyll) | |
| Water travels up the stem through hollow xylem vessels toward the leaves | |
| Water enters the root cells and moves toward the xylem vessels in the root | |
| Liquid water in the soil surrounds the root hair cells |
Compare two
Complete the table to compare xylem and phloem. Fill in as many cells as you can using what you learned in class.
| Feature | Xylem | Phloem |
|---|---|---|
| Are the cells living or dead? | ||
| Direction substances travel | ||
| What substance is transported? | ||
| Key structural feature of cells | ||
| Main purpose in the plant |
1. A scientist cuts through the stem of a geranium plant and seals only the xylem vessels with wax. Predict what will happen to the leaves over the next 24 hours. Explain your answer using lesson concepts.
2. Explain why transpiration rate increases on a hot, windy day. In your answer refer to what happens at the stomata.
Wrap Up
In one sentence, what was the main idea of this lesson?