Question

VII. Answer the following questions.
1. What is food? List out the functions performed by food in our body.
2. How is the presence of starch tested in a food item?
3. Define winnowing. How is it done?
4. Explain with diagrams the two types of venations in leaves.
5. Explain the water cycle with a suitable diagram.
6. Mention the different traditional methods of separating mixtures.
7. Define solubility. What are the factors that affect solubility?
8. Write two differences between reversible and irreversible changes with examples.
9. State whether the followings are endothermic or exothermic reactions:
(a) melting of ice
(b) lightning eruption
(c) volcanic eruption
(d) baking soda
10. Draw and explain the process of filtration.​

Answer 1

Explanation:

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1. Anything which provides us energy to make us do daily activities in day to day life with nourishment is called food.

2.When we put some Iodine solution, if it turns blue black, then we can say it has starch.

3. Winnowing is done when we need to differentiate light and heavy particles. A huge fan is put where light particles fly away and heavy ones settle down.

4.Attachment

5. ATTACHMENT 1 is Evaporation , 2 is Condensation and 3 Precipitation.

6. Methods are winnowing, seiving, and hand separation .

7. The amount of solute to be dissolved in solvent at certain temperature is solubility. Temperature and Pressure are the factors.

8. Reversible change are reversible. They ate often regarded as Physical changes. Ex - Condensation

Irreversible changes are not reversible. They are called chemical change. Ex - Burning paper.

• 9. Melting of Ice Exothermic
• Lighting Exothermic
• Volcanic Eruption Exothermic
• Baking Soda Exothermic.

10.

1. Take a soil water solution.
2. Then, take filter cone and spread the filter paper in it.
3. Put a beaker under it.
4. Pour the solution through it.
5. Soil sticks in filter paper and clear water is obtained in the beaker.