Organisms which prepare food for themselves using simple naturally available raw materials are referred to as

1

(a)

heterotrophs

(b)

autotrophs

(c)

parasites

(d)

saprophytes

Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy?

1

(a)

Woollen shawl

(b)

Silk scarf

(c)

Animal fur cap

(d)

Leather jacket

Choose the odd one from the following options.

1

(a)

Thick layer of fat under the skin

(b)

White fur

(c)

Long grasping tail

(d)

Wide and large feet with sharp claws

Orissa was hit by a cyclone with wind speed of 200 km/h on which date

1

(a)

18Oct, 1998

(b)

18 Oct, 1999

(c)

18 Oct, 2001

(d)

18 Oct, 2000

Which factor influence soil formation?

1

(a)

Climate

(b)

Vegetation

(c)

Parent rock

(d)

All of these

During exhalation, the ribs

1

(a)

move outwards

(b)

move downwards

(c)

move upwards

(d)

do not move at all

Removal of metabolic waste from body is termed as:

1

(a)

Ingestion

(b)

Egestion

(c)

Excretion

(d)

Elimination

Which of the following cannot be used for the measurement of time?

1

(a)

A leaking tap

(b)

Simple pendulum

(c)

Shadow of an object during the day

(d)

Blinking of eyes

The colour of light which is deviated the least by prism in the spectrum of white light is

1

(a)

violet

(b)

green

(c)

yellow

(d)

red

A series of eating and being eaten is called:

1

(a)

Food chain

(b)

Food web

(c)

Food series

(d)

Food hub

Green plants are called _____________ since they synthesise their own food.

1

(a)

A ______ is a long continuous thread.

1

(a)

yarn

The whole ______ of India is vulnerable to cyclone.

1

(a)

Coastline

A virtual image is always _________.

1

(a)

Erect

A tubewell draws underground water contained in an _________________

1

(a)

aquifer

Diarrhoea can be treated by only giving water to the patient.

1

(a) True

(b) False

Both moisture and air are essential for rusting.

1

(a) False

(b) True

Insects have spiracles on the lower surface of the body.

1

(a) True

(b) False

The symbols of all units are written in singular.

1

(a) False

(b) True

Poor sanitation and contaminated drinking water is the cause of a large number of diseases.

1

(a) False

(b) True

State whether food is made in all parts of plants or only in certain parts.

1

(a)

The food is made mainly in leaves and some green parts of the plants.

Why do we wear light coloured clothes when it is hot?

1

(a)

Light coloured clothes of cotton give us a feeling of coldness by reflecting heat.

Explain crystallization

1

(a)

The process by which pure crystals of a substance are obtained from solution of its crude sample in water is called crystallization.

Give one word substitute for the areas with hot and dry climate.

1

(a)

Desert.

How does air move from one region to the other with respect to pressure?

1

(a)

The air moves from high pressure region to low pressure region.

What do you understand by soil texture?

1

(a)

The soil texture is determined by the relative proportion of particles of different size.

What is the pulse rate of a normal person?

1

(a)

Between 72 and 80 beats per min.

What is meant by rectilinear propagation of light?

1

(a)

It means that beam of light always travels in straight line.

What do you mean by ground water? What are the sources of water which are fead by ground water.

1

(a)

The water found below the water table is called ground water. The sources of ground water are well lake, pond, spring, hunt, pump etc.

How can we make water clean?

1

(a)

We can clean water by removing pollutants.

Do you know the functions of the tongue?

2

(a)

Respiration is a continous process. What is the need for it to be continuous rather than being like photosynthesis?

2

(a)

Sanitation can be improved. Explain, what step should be taken to improve it.

2

(a)

1. There is shimmering of air just above the soil during hot summer day. What does the term shimmering indicate?

   2

   (a)

2. An erect and enlarged image of an object is formed on a screen. Explain how this could be possible.

   2

   (a)

1. Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

   3

   (a)

2. Name any two effects of electric current.

   3

   (a)

Write the three components and their functions of juice secreted by the inner wall of the stomach.

3

(a)

The internal structure of heart has four chambers.
(a) Name the upper chambers of heart.
(b) Name the lower chambers of heart.

3

(a)

Life would be impossible without plants. Explain, how.

3

(a)

Explain the working of a thermo flask.

5

(a)

1. (a) Soil has various important component. Write them.
   (b) Arrange the following rock particles which occur in soil in the increasing order. Silt, clay, gravel, sand.
   (c) Observe the following figure. What does this figure show?
   

   5

   (a)

2. List some animals around you. Now group them as follows:
   (a) Animals that can breathe only through skin.
   (b) The animal that can breathe through skin as well as through lungs.
   (c) The animal that can breathe through lungs.
   (d) Animals that can breathe through gills.
   (e) Animals that can breathe through spiracle and tracheae?

   5

   (a)

1. A jug placed facing a plane mirror. Draw the position or image of jug.
   
   Answer the following questions:
   (i) What is the size of the image of the jug?
   (ii) What is the distance between image of jug and mirror?

   5

   (a)

2. A snake charmer came to the society and smelled the presence of a cobra near the guardroom. The head of the society agreed to allow the man to search, catch and take away the snake with him. Little Krishi who was seeing all this disagreed. He explained the people that it might disturb the food chain in the environment. Now, answer the following questions
   (a) Describe food chain.
   (b) Construct a food chain involving snake at one of its level.
   (c) What are the values shown by Krishi?

   5

   (a)