Question
Distinguish between biodegradable and non-biodegradable wastes.
✓
Answer
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S. No.
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Biodegradable wastes
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Non-biodegradable wastes
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$(i)$
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These are wastes which can be broken down to harmless or non-poisonous substances by the action of microorganisms.
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These are wastes which cannot be broken down to harmless or nonpoisonous substances by the action of micro-organisms.
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$(ii)$
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These wastes undergo rotting.
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These wastes do not undergo rotting or take a very long time for rotting.
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$(iii)$
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Example: domestic sewage, newspapers and vegetable matter.
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Example: polythene bags, plastics, glass, aluminium cans, iron nails and $DDT$.
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$SNAKES$ $AND$ $LADDERS$
Make a board-game just like ‘snakes and ladders’ with $10 \times 10$ grid boxes.
The mouth of the snake will represent the faulty food habit or faulty method of cooking. Its tail will represent the deficiency disease caused or loss of any nutrient in food.
Similarly, the box at the base of a ladder will represent healthy food habit or healthy method of cooking. Its upper end will represent the beneficial effect of that habit. An example is given as. Complete the board and play with your friends.
→Make a board-game just like ‘snakes and ladders’ with $10 \times 10$ grid boxes.
The mouth of the snake will represent the faulty food habit or faulty method of cooking. Its tail will represent the deficiency disease caused or loss of any nutrient in food.
Similarly, the box at the base of a ladder will represent healthy food habit or healthy method of cooking. Its upper end will represent the beneficial effect of that habit. An example is given as. Complete the board and play with your friends.
Answer the following questions.
- List all those components of food that provide nutrients.
- Mention two components of food that do not provide nutrients.
Name the steps and methods you will use to separate the following:
- Coconut oil, salt and water.
- Chalk powder, water and stones.
- Iron filings, sand and salt.
List the similarities and differences in life cycles of plants and animals.