The Amazing Circle of Life!

Science Year 3/4
This unit is part of Year 3/4 Science The Circle of Life

Objectives

So what happens to the top predator at the end of the food chain? Does all that amazing food energy disappear? No! It is recycled back to the earth so the whole process can begin again, but how does this happen? Discover the secrets of the fabulous team of decomposers - nature’s wonderful recyclers!

Science Objectives
i) Describe the simple functions of the basic parts of the digestive system in humans
ii) Identify the different types of teeth in humans and their simple functions
iii) Construct and interpret a variety of food chains, identifying producers, predators and prey

Working Scientifically

  1. Making systematic and careful observations
  2. Reporting on findings from enquiries, including oral and written explanations, displays or presentations of results and conclusions

You Will Need

Provided Resources

  • A set of 1-6 hold up cards per group of 3-4 children from the Resource Pack - alternatively give each group a 1-6 set of digit cards or a number fan


Additional Resources

  • A tub of cubes or counters (to award as game points)
  • Specimens to show decomposers at work: some mushrooms, or better still some decaying wood that has some fungi growing on it (if you can find some), some mouldy or mildewed fruit, e.g. over ripe strawberries, plums or grapes with mouldy “bloom” on them, some mouldy bread in a sealed clear plastic bag, some soil with decaying leaf mould in it and ideally some creatures that are decomposers along with it, e.g. woodlice, centipedes etc.
  • Magnifying lenses and/or binocular viewers
  • Pencils & pens
  • Paper


Weblinks
Food chains and food webs in animals from www.bbc.com

Lesson Planning

Teaching

  • To identify a variety of decomposers and scavengers including fungi, bacteria, invertebrates and birds.
  • To understand the crucial role played by decomposers in recycling nutrients back to the soil at the end of the food chain and use appropriate scientific vocabulary to explain this.

Activities

  1. Play a team game to help identify a variety of decomposers and learn more about them (Yrs 3&4)
  2. Make some close observations of decomposers and the evidence of the decomposition process using magnifying lenses (Yrs 3&4)
  3. Write an explanation of the role of decomposers either by doing a cloze procedure (Yr3) or by using key words to write an explanatory paragraph (Yr4)
  4. Take part in a Circle of Life Quiz to review their knowledge and understanding of this block of learning (Yrs 3&4)


Investigation
How is the circle of life completed? Understand the role of decomposers in returning the nutrients to the soil. What is the role of the sun? How can we show this in dance? Plan the sequence with music – some with whole class some sections in groups.
Year 3 /Year 4 Work together in mixed groups with higher expectations of year 4s


Vocabulary
Scavengers, decomposers, breakdown, recycle, plus all vocab previously taught in this block