# Ecosystems 6

Year 10 Topic 2 – Learning Opportunity 6: **Belt transects.**

This learning opportunity has **6 tasks** to complete.

Target time: **50 minutes**.

**By the end of this learning opportunity you will be able to**: * explain how to determine the number of organisms in a given area using raw data from field-work techniques, including quadrats and belt transects*.

**Key words: **quadrat, sample, estimate, random, belt transect.

**Task 1:** A belt transect can be used to investigate the relationship between organisms and their environment. **Write out** the steps for using a quadrat into the correct order. **Watch **the video to help you.

• Measure the area of the field and the quadrat

• Place a quadrat next to the measuring tape at regular intervals

• Also measure a value for environmental factors e.g. light intensity

• Count all of the organisms inside of the quadrat

• Lay out a measuring tape between two areas

• Record the number of organisms and value for the environmental factor

Find the answers at the end of the blog.

**Task 2:** **Copy **the table and **use the diagram** of a belt transect to **complete **it by **counting **the number of clover.

Distance from tree (m) | Number of Clover |

2 | |

4 | |

6 | |

8 | |

10 |

Find the answer at the end of the blog.

**Task 3:** **Identify **any anomalous results in your results table by **circling** them.

Find the answer at the end of the blog.

**Task 4:** **Describe **the pattern shown in the table and **suggest an** **explanation **for this pattern.

*As you move closer to the tree…* (what happens to the number of clover?)*This could be explained by…*

Find the answer at the end of the blog.

**Task 1: Answers**

1. Lay out a measuring tape between two areas

2. Place a quadrat next to the measuring tape at regular intervals

3. Count all of the organisms inside of the quadrat

4. Record the number of organisms

5. Also measure and record a value for environmental factors e.g. light intensity

**Tasks 2 and 3: Answers**

Distance from tree (m) | Number of Clover |

2 | 2 |

4 | 2 |

6 | 5 |

8 | 3 (anomalous) |

10 | 6 |

**Task 4: Answers**

*As you move towards the tree… *the less clover there are.

This could be explained by…** **there being less light available as the tree blocks it/causes shade, so less light is available for photosynthesis and less clover grow. Also, closer to the tree there would be competition for resources such as water and nutrients, so less clover would be able to grow.

**Task 5: Complete **the quiz using the link below.

You might need to refer to this image if it doesn’t appear in the quiz

**Challenge Task:** Complete the exam question below.

## Challenge Task: Answers

**End of Learning Opportunity** **6**