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 adaptive features of a lion that help it in hunting:
(i) Light brown colour of skin, which helps it to hide in dry grasslands when it hunts for prey.
(ii) Eyes in front of face, which help it to know the correct location of its prey.
(iii) Powerful paws and long claws, which help it . to catch and kill the prey

Draw a curved line CD. Take a thread and make a knot at one of its ends. Keep the knot made in the thread on point C of the line. Place a small portion of the thread along the line, keeping it tight using your fingers and thumb. Keep on stretching the thread on the curved line till you take the thread to the point D of the line. Make a mark on the thread where it touches the other end of the line at point D. Now, stretch the thread along a metre scale and the length between the knot in the beginning and mark on the thread is measured through scale. This measured length on scale will give you the length of the curved line CD.

The complete table is shown as below:

(a) Sarita can follow the following steps:
(i) Collect plant twig with flowers.
(ii) Press the8m in papers/magazines.
(iii) Change the paper/magazine every day for 5-6 days.
(iv) When plants are well pressed and dried place them on white plane paper sheet.
(v) Stick the plants to sheet with cello tape.
(vi) Try to identify the plant.
(vii) Take help of teachers/seniors for plant identification.
(b) Yes, plants can also be identified on the basis of the nature of their stem and size.
(c) Inquisitive, scientific attitude and love for nature.

(a) The process of making a fabric (or cloth) by arranging yarns (long threads) passing in one direction with other yarns at right angles to them, is called weaving. Thus, weaving involves two sets of yarns arranged at right angles to one another.
(b) Device for making fabrics by weaving yarns or threads is called a loom.
(c) The teacher is very knowledgeable and dedicated, having patience and helpful. Children are inquisitive and obedient.

(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.

(a) Food habits of people in Chennai were different as they used coconut oil for cooking and coconut is extensively used in preparing other dishes. Rice was part of every meal, they consume less or no chapatis.
(b) Food habits refer to particular interest towards certain types of food. It is commonly influenced by location, climate and availability.
(c) Sambhar dal is very common. Its main ingredients are dal, condiments, vegetables and oil. All of these ingredients are plant products.
(d) Rajni is friendly, observant and knowledge seeking girl. She is aware of her surroundings which is very important.

(a) Sprouting is based on germination process.
(b) (i) Sprouts contain more vitamins and higher protein content.
     (ii) They form easy and nutritious snacks.