## Pastoralists in the Modern World

(NCERT Solutions)

Q1: Explain why nomadic tribes need to move from one place to another. What are the advantages to the environment of this continuous movement?

Answer:  There were many need of nomadic tribes to move from one place to another:

① The nomadic tribes had no regular fields of their own from where they could get fodder for their cattle.

② They lived with their herd in the low hills of the Himalayas from September to April because; the huge mountains or high altitudes were covered with snow during this period. In these areas, the dry scrub forests provided pastures for their herds during this period.

③ With the onset of summer, as the snow melted and the hillsides began to be covered with lush green with a variety of new grasses, the pastoralists started their northward march for their summer grazing grounds.

④ Again with the onset of winter when the mountains began to be covered with snow and there was a dearth of nutritious forage, these pastoralists on the move again, this time on their downward journey.

The movement of the nomadic pastoralists from the downward to the upward areas and vice-versa allowed sufficient time for natural restoration of vegetation grounds. Their continuous shifting provided sufficient forage to the different animals both at the high mountains and the lower hills. They also helped in maintaining the quality of the pastures.

## Matter in our surroundings

Revision Assignment

Q1. What is the physical nature of matter?

Q2. What are the characteristics of particles of matter?

Q3. Why do the particles mix faster in gases than in solids or liquids?

Q4. Why can you smell an incense stick in the whole room even if it is lit in one place?

Q5. Comment on the properties of matter in tabulated form keeping in mind the rigidity,  compressibility, kinetic energy,  fluidity and density.

## Force and Pressure

Class 8 - Science
(Worksheet)

Fill in the blanks

1. Muscular force is an example of _______ force.

2. Oil is applied to machines to reduce _______ force.

3. S.I unit of pressure is ____________.

4. S.I. unit of force is _____________.

5. If the area of contact is increased, then pressure ______ _.

6. Pressure in solid depends upon ________________ and ____________.

## How the State Government Works

VII Social Science
Political Science Chapter 03
NCERT Solutions

Question 1. Use the terms ‘constituency’ and ‘represent’ to explain who an MLA and how is the person elected?

Every state in India has a Legislative Assembly and each state is divided into different areas or constituencies. From each constituency, the people elect one representative who then becomes a Member of the Legislative Assembly (MLA). Each MLA belongs to a particular political party. MLAs are elected by the people and form the government, hence, they represent the people.

## Value Based Questions and Answers on Macro Economics

Very Short Questions and Answers (VSQA)

Q1:  Ms. Nidhi is interested in knowing the change in quantity produced by a farmer with a fall in the price of the product. Which branch of economics would she study to ascertain the change?

Q2: Give an example to show that an item which is kept constant in micro economics is considered a variable in macro economics.

Answer:  National Income is kept constant in micro economics, but in macro economics, it is considered as an important variable.

Q3: What is the rationale for not taking into account the value of   intermediate goods in the measure of Gross Domestic Product?

Answer:  To avoid the problem of double counting.

## General Science Quiz

Q1: Which of the following is not example bio-mass energy source?

(a) Wood
(b) Gobar gas
(c) Atomic energy
(d) Coal

Q2: The scientific study of earthquakes is known as

(a) Seismology
(b) Cosmology
(c) Ecology
(d) Pathology

Q3: Which of the following is a plant hormone?

(a) Insulin
(b) Thyroxin
(c) Estrogen
(d) Cytokinin

## Biology - Our Environment

Revision Assignment

ONE MARK QUESTIONS

1. Using Kulhads as disposable cups to serve tea in trains, proved to be a bad idea. Why?

2. Why is plastic not degraded by bacteria?

TWO MARK QUESTIONS

3. DDT has entered the food chain. Which food habit is safer- vegetarian or non-vegetarian?

4. Classify the flowing as decomposers and producers Green plants, bacteria, fungi, algae, blue-green algae.

5. Distinguish between producers and consumers.

6. Name two environment-friendly practices.

7. Write any two ways of energy flow through an ecosystem.