Exercise Question Answer for Chapter 1 -The Story of Indian Farming for Class 7 in Subject Social Science ******************************** The Big Questions ? 1. What are the main characteristics of Indian agriculture? Indian agriculture includes crop farming, animal rearing, fisheries, forestry, and horticulture . It is practiced in different climates and regions across the country. Farming follows three seasons – kharif, rabi, and zaid . It uses a mix of traditional and modern methods . A large part of India’s population depends on agriculture for livelihood . 2. How are farming, climate, soil, and water interrelated? Climate decides temperature and rainfall needed for crops. Soil type provides nutrients and support to plants. Water availability affects crop growth and yield. Different crops grow where climate, soil, and water suit them . Farming depends on the balance of all three factors . 3. How can traditional practices and contemporary ones co...
Important Question Answers
Methods of Separation in Everyday Life
Class -6
Subject-Science
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1 Mark Questions
What is winnowing?
- Winnowing is the process of separating lighter particles like husk from heavier particles like grains using air or wind.
Name a method to separate cream from milk.
- Churning.
What is filtration used for?
- Filtration is used to separate insoluble solids from liquids.
What remains in the sieve during sieving?
- Bigger particles, such as stones or bran, remain in the sieve.
What type of materials can be separated using a magnet?
- Magnetic materials like iron, nickel, and cobalt.
2 Marks Questions
What is sedimentation?
- Sedimentation is the process where heavier particles settle down at the bottom of a liquid when left undisturbed.
How is decantation different from filtration?
- In decantation, the liquid is gently poured off after sedimentation, while filtration uses a filter to remove insoluble solids.
Give two examples where sieving is used.
- Removing stones from flour.
- Separating sand from pebbles.
3 Marks Questions
What is the difference between evaporation and condensation?
- Evaporation: Conversion of liquid into vapor due to heat.
- Condensation: Conversion of vapor back into liquid when cooled.
- Evaporation is used to separate dissolved solids like salt from water, while condensation collects the vapor as liquid.
Write any three uses of filtration.
- Separating tea leaves from tea.
- Purifying drinking water.
- Separating mud particles from muddy water.
5 Marks Questions
Describe the steps to separate a mixture of sand, water, and sugar.
- Step 1: Add water to the mixture to dissolve sugar.
- Step 2: Filter the mixture to remove sand as residue.
- Step 3: Heat the filtrate (sugar solution) to evaporate water.
- Step 4: Collect sugar crystals after evaporation.
Explain the process of obtaining salt from seawater.
- Step 1: Seawater is collected in shallow pits.
- Step 2: Sunlight heats the water, causing evaporation.
- Step 3: The water evaporates, leaving behind salt.
- Step 4: The salt is further purified before use.
Match the Following
| Column I | Column II |
|---|---|
| Separating husk from grains | Winnowing |
| Separating salt from seawater | Evaporation |
| Removing tea leaves from tea | Filtration |
| Separating oil from water | Decantation |
| Separating stones from flour | Sieving |
True/False Questions
- Magnetic separation can be used to separate plastic from iron nails. True
- Winnowing is used to separate stones from rice. False (It separates husk from grains.)
- Evaporation can separate salt from seawater. True
- Decantation removes all solid particles completely. False (Some particles may remain.)
- Churning is used to separate butter from curd. True
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