Topic Ten (1.10): Leaf structure and photosynthesis

Topics Icon.png Objectives

By the end of this topic, you should be able to:

  • explain how the structure of a leaf is adapted to its function.

Revision Tasks Icon.png Retrieval starter question

  • Name two ways in which an alveolus is adapted for gas exchange.

Introduction Icon.png Introduction

In this topic, you will learn about the adaptations of leaves. A plant needs to photosynthesise to make glucose. Plants take in carbon dioxide and release oxygen as a waste gas. A leaf has many different types of cells and many adaptations in order that gas exchange can occur.

Interact Icon.png Working through your course book

Reactivate activity - optional

Before applying your knowledge to new concepts in this topic, you can check your understanding of previous concepts. If you want to check your understanding and reactivate your knowledge, please complete this reactivate activity:

  • Read page 39 of your Activate 3 coursebook and watch the Revision Monkey video below about photosynthesis:

  • Answer the Reactivate your knowledge questions at the top of page 46.
  • Read pages 42-43 of your Activate 3 coursebook.

Apply your knowledge

You are now ready to apply your knowledge. We are going to look at the inside of a leaf. Leaves are very thin, but there are many cell layers inside. Leaves are the main gas exchange surface of a plant. They have a large surface area to maximise light absorption. They are thin which allows for the diffusion of gases. 

  • Read pages 44-46 of your Activate 3 coursebook. 
  • Watch the two videos below about leaf structure:

WATCH - Parts of the Plant: Leaves (Twig) [Not available on sample course]

  • Using Figure 2 on page 46 and information from page 47, explain the function of each cell layer.

COMPLETE - (Question 4) Biology 3 Vocab Builder 2 (Kerboodle) Links to an external site.

  • Complete Summary questions 1-6 on page 47 of your Activate 3 coursebook.

Stretch Icon.png Extension activities for this topic

Answer Summary questions 3 a-c on page 53.

Download Icon.png Check your answers

CHECK - Topic question answers - Module One (Kerboodle)

CHECK - Student Book Answers – B3 Chapter 2 (Kerboodle)

[Not available on sample course]