Soluble materials - Salt and sugar.
Insoluble materials - Sand and chalk

Fixed joint is the one where there is no relative movement of the bones. The joint between the head and the upper jaw is an example of fixed joint.

These fibres are normally used for a variety of clothing items by using process of spinning, weaving and knitting.

Arrangement of veins on the lamina of leaf is called venation. They are of two types:
(a)Reticulate venation
(b) Parallel venation

(i) Condensation
(ii) Evaporation
(iii) Condensation
(iv) Evaporation

Foot, handspan and arm length are used to measure the length. These are inexact methods of measurement.

No, the materials like iron bar, plastic or wooden scale inside the statue will not come in the same direction.

The stray animals feed on the content of these bags and end up eating plastic.

Animals unable to cope in harshen conditions go to sleep to prevent extreme cold and food shortage, this is known as hibernation.

The gadgets which use electricity are fan, heater, television, air conditioner, etc.

Yes because oxygen present in air supports burning.

To see a thing, there must be light which comes after reflection from the object to our eyes. In dark room there is no light, so we are not able to see our face.

The two changes which cannot be reverse are
(i) Change of milk into curd.
(ii) Rusting of iron

The process of conversion of water vapour into its liquid form is called condensation.

No, different nutrients are available from variety of foods derived from different sources.

Carrot and radish are used as vegetables.

The chemical energy stored in the chemicals stored inside a cell converts into electrical energy. When the chemicals of the cell are used up, it stops producing electricity.

The table to explain the movement of animals from place to place is given below:

Water pipes break because the water inside them expands as it gets close to freezing. This causes an increase in pressure inside the pipe. When the pressure gets too high for the pipe to contain, it breaks.

(a) Carbohydrates are the compounds made up of carbon, hydrogen and oxygen. These are formed in plants during photosynthesis, e.g., glucose.
(b) Carbohydrates found in our food are in the form of starch and sugar.

(b) A freely suspended magnet orients itself in North-South direction of the earth.
(a) Monami is intelligent and caring girl.

Composting It is a natural process by which biodegradable waste like leaves can be turned into manures by the use of microbes only.
Vermicomposting In this process, manure is formed from the waste by use of redworms along with the microbes.

(a) Photosynthesis by plants.
(b) Respiration by plants and animals and burning of fuels.

Following are the non-living things from the list which were once part of living things:
Butter - Obtained from milk from dairy animals
Leather - From animal skin
Wool - From hair of sheep or goat
Cooking oil - Seeds of plants
Apple - Fruit from apple tree
Rubber - Latex of rubber tree

(a) Ankit is intelligent and has good knowledge of light.
(b) During the image formation in plane mirror. Left seems to be right and right seems to be left, this is called lateral inversion.

The rainwater runs on the surface of the earth and gets collected at the low lying areas. This results in the formation of lakes and ponds.

Yes, a person driving a car is in rest with respect to other person in car but in motion with respect to a person standing roadside. State of motion and rest depends upon observer or reference point.

The main features of fabric which is made up of coconut fibre
(i) The fibre in the coconut shell is also known as coir. It is the latest eco-friendly fabric.
(ii) Fabrics made from coconut fibre provide accelerated moisture management and protection from harmful UV (ultraviolet) rays.
(iii) Coconut fabrics are lightweighted, machine washable and naturally fit for comfort, quality and performance, e.g. doormats, brushes, mattresses, etc.

Yes, the stem of a plant can be compared with a street with two ways traffic because
(i) It carries water and minerals from the roots to the leaves and other parts of plant in upward direction.
(ii) It takes the prepared food by the leaves to other parts of the plant.

Yes, it is possible to separate sugar mixed with wheat flour by sieving.
Size of sugar particles is more than that of the wheat flour. So, sugar will stay on sieve and wheat flour will pass through the holes of the sieve.

Ingredients of pizza are maida, butter, cheese and vegetables.
(a) Maida and vegetables come from plants.
(b) Butter and cheese do not come from plants. They come from animals.

Take a candle and fix it at the centre of a glass vessel. Add some quantity of water in the vessel. Now place an empty dry glass jar over it. Mark five lines at an equal distance above the water surface. Now, carefully light the candle and cover the glass jar. Wait for a few seconds and how the flame will be extinguished due to absence of oxygen to bum.
Now, we can observe that the water level raised in the glass jar is 1/5 of the volume of air present in the glass jar
This experiment shows that one-fifth of air is oxygen

Following steps are used to prepare a magnetic compass by using an iron needle and a bar magnet:
(i) Take a small piece of cork, and the magnetised needle (which can be magnetised by using a bar magnet).
(ii) Take a cup filled with water and let the cork float on it; the needle should not touch the water.
(iii) Now, compass is ready to work. Note the direction in which the needle points when the cork is floating.
(iv) Rotate the cork in different directions. Note the direction in which the needle points when the cork begins to float again without rotating. We see that the needle always points in the same direction, when the cork floats without rotation

Activity showing magnetic compass by using iron needle and a bar magnet

There are following properties by which we can prove that these materials are different:

The quality of cotton fabrics can be improved by :
(i) improving the quality of soil.
(ii) protecting the crops from pests.
(iii) discarding infected fibres.
(iv) twisting the fibres to make yarn properly.
(v) ensuring minimum or no gaps during weaving.

(ii) Value: Caring, loyal towards his friend.
(ill) The doctor has extensive knowledge of bones
dislocations and other disorders.

Characteristics of plants are :
(i) They cannot move from one place to another.
(ii) They can prepare their own food.
(iii) These are the living organisms on the earth which are responsible for the formation of food for all the living forms directly or indirectly.
(iv) All other organisms on the earth depend on the plants and their products for their survival.
(v) Plants grow in the soil from where they take nutrients for their growth and propagation.

Burning of leaves leads to air pollution and release of toxic gases which can cause diseases in living organisms.
No, burning of leaves is not illegal but it should be because leaves can be disposed in a very useful manner like compost.
It also releases harmful components in air on burning which leads to respiratory diseases and cancer in all.

(a) The direction of current will be from Q to P in A and direction of current will be from P to Q in B. Because direction of current is always from positive terminal to negative terminal of the cell or battery.
(b) Yes, the bulb will glow in both the cases because to glow the bulb, we just need to complete the circuit.
(c) No, the brightness of the bulb never depend upon the direction of current passing through it.

(a) Plants growing in different places appear different due to the presence of unique adaptive features which can be morphological or functional
(b) It is called a habitat. It provides food, water and shelter, etc., to all living organisms
(c) Two types of habitats have been observed
(i) terrestrial (ii) aquatic
(d) Leaves of cactus present in desert are thorn like (spines) on reduced to green fleshy stem, to reduce rate of transpiration while leaves of trees like deodars have cone or pine-shaped leaves to let show falling on them slide off easily.
(e) Ravi and Ritu both are adventurous, curious and observant. They are learners and have scientific temperament.

Yes, the shadow will be formed in all the cases but in all the cases, the darkness of the shadow will be different.
(i) Most of the light in case of transparent sheet will pass through the glass. So, the darkness of shadow will be very low.
(ii) Also most the light in case of muslin cloth will be reflected. So, the shadow will be darker than the transparent sheet.
(iii) While in case of plywood, all the light would be stopped completely by the plywood. So, the darkness strength will be highest in this case.

The process by which land water returns back to a sea or an ocean is as follows:
(i) Snow/Rain falling on the mountains melts into water that flows down in the form of streams and rivers.
(ii) A part of the rainwater gets absorbed into the ground and rest also flow in the form of stream or rivers.
(iii) The river water after passing through various regions ultimately reaches into a sea or an ocean

Elastic tapes are stretchable due to which their length can be increased during the measurement if it is not handle with care. Therefore, the measurement done by elastic tapes may be greater than the actual length of the object. So, we can say that elastic tapes are not accurate to measure a length.

(i) happy
(ii) sun
(iii) threshed
(iv) winnowed
(v) handpicked
(vi) sieved
They got a good price as they used appropriate methods of separation to get good quality of flour (atta).

(a) Many vegetables contain most of the nutrients just below their skin surface. Thick peeling may lead to their removal.
(b) Washing of vegetables after peeling or cutting removes the water soluble vitamins and minerals from them and lowers their nutritive value.
(c) These components are called nutrients like minerals (iron, calcium, phosporous) and vitamins (B, A, C, D, E).
(d) Vegetables like tomatoes, potatoes, green leafy vegetables, etc.
(e) Yes, Radha is sincere, observant, helpful and knowledgeable. She used her knowledge in right place and stopped her mother for doing incorrect work.