1. Can you act like the animals seen in the pond? Which animal makes what kind of
sounds and movement? Try to make similar sounds.
Ans. Teacher can help the students to act like animals seen in the pond.
Given below are the sounds produced by some of the animals.
(1) Dog: Bow-Bow
(2) Cat: Mew-Mew
(3) Lion: Gurr-Gurr
(4) Frog: Croak-Croak
(5) Goat: Mein-Mein
(6) Crow: Caw-Caw
(7) Cuckoo: Koo-Koo
2. You must have seen many animals too write which of them.
Ans.
Can fly: Butterfly, Pigeon, Parrot
Can crawl: Lizard, Snake, Tortoise
Can walk: Cow, Buffalo, Ox
Can hop: Frog, Kangaroo, Hare
Can wings: Pigeon, Cuckoo, Sparrow
Have feet: Cow, Goat, Bear
Have a tail: Monkey, Cow, Buffalo
3. Find my name in the crossword and put a oval shape around it. One example has
been given.
(i) Banana is what I love eating,
I spend my time jumping and leaping.
Ans. Monkey.
(ii) On the walls, webs I weave
Where insects stick and cannot leave.
Ans. Spider.
(iii) I remain awake the whole night,
And go to sleep in board daylight.
Ans. Owl.
(iv) Croak, croak, croak is my sound.
In water or on land I am found.
Ans. Frog.
(v) I appear after rainfall,
Have no feet so I crawl.
Ans. Snail.
4. Spend some time under a tree. Observe the animals carefully. Name the animals
which can be seen
Ans.
On the branches: Parrot, Crow, Monkey
On the leaves: Beetle, Caterpillar, Grasshopper
On the trunk: Squirrel, Ant, Termite
On the ground: Rat, Snake, Rabbit
Around the ground: Cow, Dog, Cat
5. Now arrange the animals in the order of their size – smallest being the first.
Ans. Termite, Ant, Beetle, Caterpillar, Grasshopper, Rat, Parrot, Crow, Squirrel, Snake, Rabbit,
Cat, Dog, Monkey, Cow.
Q.1. Collect some bricks. Lay them on the ground in the line as shown in the picture. Try
walking on them. Was it easy?
Ans. Yes.
Q.2. Make a small bridge by tying together 4 or 5 bamboo poles. Ask your teacher to
help you. Now walk on your bridge. How did your feel? Did you fall down? If you walk
like this a few times, you will start finding it easy.
Ans. At first, I found it difficult to walk. Later, it became easy.
Q.3. Do you think it would be easier to walk on this bridge in bare feet, or with shoes or
slippers? Why?
Ans. It is easier to walk on this bridge in bare feet. It has more grip with toes.
Q.4. Could you tell the difference in both the pictures? Which would be easier using
pulley or without it?
Ans. The first boy is pulling out bucket with bare hands. The second boy is using a pulley.
Pulley makes it easier.
Q.5. Look around you where all do you see the use of pulleys? List them.
Ans. Lifting heavy loads, hosting flags, etc.
Cement Bridge (Page 3)
Q.1. How is this bridge different from a bamboo bridge?
Ans. Cement bridge is wide and stable.
Q.2. How many people do you think can cross the bridge at one time?
Ans. About twenty.
Q.3. If you had a chance, which bridge would you like to use? Why?
Ans. I would like to use cement bridge. It is easier to walk on and safe also.
Q.4. Do you have to cross any bridge on the way to your school? If yes, what is the
bridge like?
Ans. I have to cross a cement bridge.
Q.5. Find out from your grand parents, what kind of bridges were there when they were
young?
Ans. At that time, there were only bamboo and wooden bridges.
1. How did the ant know that the other ants were not from its group?
Ans. Just like us, animals also have different senses. They can see, hear, smell and feel. Due
to these abilities, the ant came to know that the other ants were not from its group.
2. How did the guard ant recognize this ant?
Ans. Some animals can find their friends by their smell. The guard ant recognized this ant by
its smell.
3. How long did it take the ants to come?
Ans. It took 15-20 minutes for ants to come.
4. Did one ant come first or a group of ants come together.
Ans. One ant came first.
5. What did the ants do with the food?
Ans. Ants carried the food to their hole.
- Mention any two examples where two or more parts of the same plant are consumed as food.
Ans. Mustard – Leaves and seeds, Pumpkin – Flowers and fruit.
- Mention any one plant which grows in water and is consumed as food.
Ans. The stem of the lotus flower is consumed as food.
- Portrait any three ways which can be very effective to prevent wastage of food.
Ans.
(i) Prevent leaving food unconsumed in meals.
(ii) Follow the phrase “Eat to live” and not “live to eat” – eating more than required should be avoided
(iii) Raw edibles like grains, pulses should be stocked well.
- Name any two plants that produce sugar.
Ans.
(i) Sugarcane
(ii) Sugarbeet.
- Mention at least one non-green plant that we consume as food.
Ans. Mushroom.
- What do we call every individual’s habit to of eating a peculiar type of food items generally?
Ans. Food habit.
- Compare the food habits of a person living in North India to a person living in Tamil Nadu.
Ans. North Indian food habits: Chapatti, lassi, pulses, vegetables, rice, mustard oil.
Food habits of a person in Tamil Nadu: Dosa, Idli, sambhar, upma, rasam, and puri, etc.
- What are the ingredients used to prepare cooked rice?
Ans. Raw rice and water.
- Compare the ingredients of different food items. Are they having any common foodingredients?
Ans. Yes, they do have some ingredients in common like salt, water and ghee or oil.
- Identify the two common sources of most of the ingredients of food items that we eat.
Ans. (i) Plants
(ii) Animals
Q2: Animal nutrition includes
- Nutrient requirements
- Mode of intake of food
- Utilisation of food in body
- All of the above.
1) Which of the following is matter? Chair, air, love, smell, hate, almond, thought, cold, cold drink, smell of perfume.
Soln:Chair, Air, Almond, Cold drink.
2) Give a reason for the following observation: The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.
Soln:Generally, particles in the higher temperature possess high kinetic energy thus moves faster over a longer distance. Therefore the smell of the hot food reaches the person several meters away.
3) Name the techniques used to separate the following:
(a) Butter from curd.
(b) Salt from seawater
(c) Camphor from salt
Solution:
(a) The butter is separated from the curd based on its density through the process of centrifugation.
(b) Simple evaporation technique is used in the separation of salt from seawater. Commercially, this process is producing salt.
(c) Camphor does not undergo liquid phase during the phase change. Therefore, sublimation process is more suited for the separation of camphor from the other substance.
4) What type of mixtures are separated by the technique of crystallization?
Solution:Crystallization is a technique of separation of solid from a liquid solution. It relates to precipitation but here, the precipitate obtained is in crystal form and has a very high purity. This technique is thus used in the purification of impure substances. Example: Salt from sea water after the evaporation.
Q1) Which of the statements about the reaction below are incorrect?
2PbO(s)+C(s)→2Pb(s)+CO2(g)
(a) Lead is getting reduced
(b) Carbon Dioxide is getting oxidised
(c) Carbon is getting oxidised
(d) Lead oxide is getting reduced
(i) (a) and (b)
(ii) (a) and (c)
(iii) (a), (b) and (c)
(iv) all
Soln:
(i) (a) and (b)
Explanation: (a) because Oxygen is being removed and (b) because the removed oxygen from Lead is added to the elemental Carbon.
Q2) Fe2O3+2Al→Al2O3+2Fe
The above reaction is an example of a
- Combination reaction.
- Double displacement reaction.
- Decomposition reaction.
- Displacement reaction.
Soln:
- Displacement reaction.
Explanation: The Oxygen from the Ferrous oxide is getting displaced to the Aluminium metal to form Aluminium Oxide.
Q3) What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
- Hydrogen gas and Iron chloride are produced.
- Chlorine gas and Iron hydroxide are produced.
- No reaction takes place.
- Iron salt and water are produced.
Soln:
- Hydrogen gas and Iron chloride are produced.
Explanation: The Chlorine from the Hydrogen chloride is displaced to the Iron fillings undergoing the following reaction.
2HCl+Fe→FeCl2+H2
Q4) What is a balanced chemical equation? Why should a chemical equation be balanced?
Soln:
A balanced chemical equation is the one in which the number of different atoms on both the sides of the chemical equation that is on the reactant side and the product side of a reaction are equal. The chemical equation needs to be balanced so that it obeys the Law Of Conservation of Mass. Balancing of chemical equation has no defined method and is purely a trial and error attempt.
Q5) Translate the following statements into chemical equations and balance them.
(a) Hydrogen gas combines with nitrogen to form ammonia.
(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
(c) Barium chloride reacts with aluminium sulphate to give Aluminium chloride and a precipitate of barium sulphate.
(d) Potassium metal reacts with water to give potassium hydroxide and Hydrogen gas.
Soln:
(a) Unbalanced: H2+N2→NH3
Balanced: 3H2+N2→2NH3
(b) Unbalanced: H2S+O2→H2O+SO2
Balanced: 2H2S+3O2→2H2O+2SO2
(c) Unbalanced: BaCl2+Al2(SO4)3→AlCl3+BaSO4
Balanced: 3BaCl2+Al2(SO4)3→2AlCl3+3BaSO4
(d) Unbalanced:K+H2O→KOH+H2
Balanced: 2K+2H2O→2KOH+H2
