Rusting of iron is an example of

Which of the following is not an example of response to stimulus?

Bouncing back of ray of light from shining surface on which it was incident is known as

Wells are fed by

From all the given materials select those which can be recycled.
(i) Glass
(ii) Paper
(iii) Stone
(iv) Wood

Vitamin ________ is soluble in water.

___________ have no definite shape or volume

Plants and animals living on land, are called ___________ organisms.

A plucked string of a sitar executes ________________motion.

Be _______ while handling electric appliances

Yarn is made from fibres.

Souring of milk is a reversible change.

Sweet potato is a modified stem.

Non-luminous objects emit the light of their own.

Copper cannot be magnetised.

Name the food eaten by humans that is produced by insects.

What is spinning?

Is making an omelette reversible or irreversible change

What do you understand by the term "Gait of animals?

What is an opaque material?

How do plants obtain their food?

Some materials are float on water. Name two materials as such.

It is given that a plant is very tall and have hard, thick stem with branching on the upper part of the plants. On the basis of the given characteristics, categorise the plant. 

What features made crocodiles so adaptable to live on earth for the longest time?

Water cycle is an important process associated with water. How will you define it

Write three advantages of grouping.

Write three functions of roots.

Which of the non-living things listed below, were once part of a living thing?
Butter, leather, soil, wool, electric bulb, cooking oil, apple, rubber

As we know that silver is the best conductor of electricity instead of this we use copper and aluminium. Why?

(a) Which kind of garbage is not converted into compost by the redworms?
(b) Have you seen any other organism besides redworms in your pit? If yes, try to find out their names. Draw a figure of these.

Kavita bought new silver anklets. After a month, she found that the anklets had lost their lustre and turned black. She had doubts that they were not made of pure silver. But her mother told her that they were of pure silver. She washed her silver anklets with lemon juice and found that the silver anklets had get the lustre back.
Read the above passage and answer the following questions.
(a) Do you think that the anklets are not of pure silver?
(b) Why silver anklets lost their lustre after some time?
(c) What values were shown by Kavita's mother?

Identify the wrong statements and correct them.
(a) Anther is a part of the pistil.
(b) The visible parts of a bud are the petals.
(c) Lateral roots are present in a tap root.
(d) Leaves perform the function of transpiration only.

A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.

Suggest an activity to prepare a magnetic compass by using an iron needle and a bar magnet

Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 min and filled it in a bottle upto the brim and kept the bottle airtight till cooled down to room temperature.
(a) Why did the tiny bubbles appeared?
(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.