Year 8 Science · Unit 1 · Lesson 8

Gas Exchange in Plants

Foundation Worksheet

Name
Date
Class

Learning Goals

Warm Up

True or False? Fix the false ones

Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.

Plants only produce oxygen, they never take in oxygen or release carbon dioxide.

Correct it:

T
F

Stomata close during the day to trap carbon dioxide inside the leaf for photosynthesis.

Correct it:

T
F

During the day, when photosynthesis exceeds respiration, the net gas exchange is CO₂ in and O₂ out.

Correct it:

T
F

Root cells carry out photosynthesis because they need energy to absorb water and minerals.

Correct it:

T
F

Your Turn

Sort it!

Write each substance from the pool into the correct box. Some substances may appear in more than one box, write them in all boxes where they belong.

CO₂ enters O₂ exits Water vapour exits O₂ enters CO₂ exits Water vapour exits Net CO₂ in Net O₂ out

During the DAY (light, photosynthesis active)

During the NIGHT (dark, respiration only)

Show What You Know

1. Explain why a leaf has surface features that allow gases to move between the leaf and the environment. Use the words gases and surface in your answer.

Recall 2 marks

2. Describe the trade-off a plant faces when stomata are open. Why can't stomata stay permanently open?

Recall 2 marks

Wrap Up

In one sentence, what was the main idea of this lesson?

HSCScience · Year 8 Science · Unit 1 · Lesson 8 · Foundation Worksheet