Question
Write three ill-effects of plastics.
✓
Answer
- Burning plastics cause emission of poisonous gas.
- Plastic waste is eaten by animals resulting in their death.
- Plastics choke sewer system.
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While a mechanic was repairing a gadget using a screwdriver, the steel screws kept falling down. Suggest a way to solve the problem of the mechanic on the basis of what you have learnt in this chapter.
$SNAKES$ $AND$ $LADDERS$
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.
How does fish move in water?
Write four ways of conserving water.
‘Water does not provide nutrients, yet it is an important component of food.’ Explain?
Reshma has trouble seeing things in dim light. The doctor tested her eyesight and prescribed a particular vitamin supplement. He also advised her to include a few food items in her diet.
(i) Which deficiency disease is she suffering from?
(ii) Which food component may be lacking in her diet?
(iii) Suggest some food items that she should include in her diet to overcome this problem (any four).
(i) Which deficiency disease is she suffering from?
(ii) Which food component may be lacking in her diet?
(iii) Suggest some food items that she should include in her diet to overcome this problem (any four).
Activity.
Take four lengths of electric wire with differently coloured plastic coverings. Remove a little of the plastic covering from each length of wire at the ends. This would expose the metal wires at the ends of each length. Fix the exposed parts of two wires to the cell and the other two of the bulb as shown in Fig. $(A)$ and Fig. $(B).$
You can stick the wires to the bulb with the tape used by electricians. Use rubber bands or tape to fix the wires to the cell.Now, connect the wires fixed to the bulb with those attached to the cell in six different ways as have been shown in Fig. $C$ $[(a)$ to $(f)].$
For each arrangement, find out whether the bulb glows or not. Write “Yes’ or ‘No’ for each arrangement in your notebook.
Now, carefully look at the arrangements in which the bulb glows. Compare these with those in which the bulb does not glow.
Can you find the reason for the difference?
→Take four lengths of electric wire with differently coloured plastic coverings. Remove a little of the plastic covering from each length of wire at the ends. This would expose the metal wires at the ends of each length. Fix the exposed parts of two wires to the cell and the other two of the bulb as shown in Fig. $(A)$ and Fig. $(B).$
You can stick the wires to the bulb with the tape used by electricians. Use rubber bands or tape to fix the wires to the cell.Now, connect the wires fixed to the bulb with those attached to the cell in six different ways as have been shown in Fig. $C$ $[(a)$ to $(f)].$
For each arrangement, find out whether the bulb glows or not. Write “Yes’ or ‘No’ for each arrangement in your notebook.
Now, carefully look at the arrangements in which the bulb glows. Compare these with those in which the bulb does not glow.
Can you find the reason for the difference?
How can you show that unlike poles attract each other while like poles repel each other?
What are different types of motion? Explain with example.
List any five objects and write the names of materials they are made up of.