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Woody invasive alien plants such as black wattle, Port Jackson and rooikrans cause many problems. They are very thirsty

plants and take more water from the soil than indigenous plants. They grow very densely so fires in invasive alien vegetation are often hotter and more destructive than in indigenous vegetation. Invasive alien plants also threaten nature because they grow so quickly and densely that they take over natural habitats and prevent local plants from growing. Because indigenous animals need indigenous plants for food and shelter, invasive alien plants threaten whole ecosystems.

In this practical fieldwork activity, you will conduct an investigation, comparing the variety (diversity) of plants in two plots

of a similar area, one in natural vegetation and the other in an area invaded by alien plants.

NATURAL SCIENCES

Grade 7-9

Learning Outcome 1:

Scientific Investigations The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts. Assessment Standards

  • Plans investigations.

  • Conducts investigations and collects data.

  • Evaluates data and communicates findings.

Learning Outcome 3:

Science, society and the environment The learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment. Assessment Standard

  • Understands sustainable use of the earth’s resources.

Core Knowledge and Concepts

  • All organisms have adaptations for survival in their habitats.

This learning activity is based on an approach to planning investigations developed by the Primary Science Project

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