Some devices which make use of the electric cells are:
(i) Transistor radio, (ii) Camera, (iii) Wrist watch, (iv)Alarm clock.

Habitat is a place where animal lives and gets its food.

The motion possessed by the planets around the sun is circular motion.

Water and roughage are two components of food which do not provide any nutrients.

Pumpkin flowers are used as vegetables.

(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.

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) Yes, X is dear and Y is lion
(b) The eyes on the sides of the head enables the deer to see in all directions at the same time.
(c) The eyes in front of its head enables the lion to have correct idea of the location of its prey like deer.

(d) Shyam will measure it most accurately because of the following reasons
(i) Length 2 m which he want to measure can be measured using this scale only in a single attempt.
(ii) This scale is standard scale and will measure the correct measurements. Other scales given are either non-standard or having the length less than the length we want to measure.

We should avoid wastage of food because
(i) there are many people amongst us, who do not get sufficient food.
(ii) some people do not have enough money to buy it.

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

(a) chapati
(b) calcium,  D
(c) Butter
(d) protein,  calcium
(e) Papaya
(f) iron
(g) peas, proteins.

Opaque objects do not allow light to pass through them. When an opaque object is placed in the path of light, then the light is obstructed by the object leading to the formation of a dark patch known as the shadow of that object, which can be taken on a screen placed behind it.
Shadow formation: To form a shadow, there must be (i) a light source (ii) a screen (iii) an opaque object placed between the light source and the screen. For shadow formation, we can follow the given steps
Step 1: Take an opaque object.
Step 2: Throw light on it from a light source.
Step 3: Put a screen behind the object. In this way, a shadow of an object can be obtained on the screen.
In this way, a shadow of an object can be obtained on the screen.

Steps involved in the magnetising of an iron strip are
(i) Take an iron strip which is to be magnetised.
(ii) Keep it in a wooden table.
(iii) Hold one end of bar magnet in your hand and keep the other end of bar magnet at one end of iron bar.
(iv) Without lifting, move the lower end of bar magnet to the end of iron bar.
(v) After reaching end of iron bar, lift the bar magnet and bring it to the same position and repeat the process again and again.

(a) We should prefer using paper bags rather than polythene bags as paper can be decomposed whereas polythene bags do not degrade.
(b) Every member of the society or family is responsible to dispose off garbage properly.
(c) Earthworms are the best organisms to be used vermicomposting as they convert the waste from plants, animals or their products into compost.

(a) The plant responded to the stimuli of light. Since, light was coming through window so, plant grew towards that direction.
(b) (i) Yes, all living things responds to changes around them. These changes are called stimulus and our reaction towards them is response.
(ii) Folding/Closing of 'touch-me-not' plant leaves when someone touches its leaves closing of eyes due to sudden bright light
(c) She is careful, responsible and observant. She is also curious about unique behaviours and has an inquistive/enquiring nature.

(a) The doctor has diagnosed the fracture by taking photographs of bones, i.e. X-ray images.
(b) X-rays show us the images and shapes of different bones in our body.
(c) Friendly behaviour, sense of responsibility and kind nature are the values shown by Rishi's friends.

Sea water reaches a lake or pond is represented by a diagram:

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.

The veins of leaves and their type of venation are 

Functions of parts of a plant are

(a) The insect is 'honeybee'. Its place is 'beehive'.
(b) This insect feeds on pollens and nectar of flowers.
(c) Honeybee visits the flowers and it brings about pollination while collecting its food, thus helps the farmers, setting is facilitated.
(d) We collect honey from beehive.
(e) Honey is rich in sugars, enzymes and minerals. We use it as a food.