The biosphere – the Earth’s life envelope
Answers are for parents and teachers.
1
Make your own food chain example (4 links).
For example: grass → sheep → wolf → microbes.
2
The Earth is 4600 million years old and human ancestors have existed for 2 million years. For how many million years was the Earth without humans (4600 – 2)?
4598
3
Write the names of 5 plants and 3 animals in your garden or yard (observe; do not taste any plants).
The answer depends on observation.
4
Write two examples of human harm to the biosphere and a way to reduce it.
For example: cutting forests and polluting air; planting trees and sorting waste.
5
Why do carnivores also decrease if plants in the chain decrease?
Because herbivores lose food, and when they decrease the carnivores’ food decreases too.