11/01/2022
CHAPTER 12 MEASUREMENT
Answer the following:-
Q.1. What is the temperature of a normal human body?
Ans. The temperature of a normal human body is 98.6 ° F.
Q.2. What unit do we use to measure the weight of an object?
Ans. A kilogram is used to measure the weight of an object.
Q.3. Name the two units for measuring temperature.
Ans. Fahrenheit and Celsius are the two units for measuring temperature.
Q.4. How many minutes are there in an hour?
Ans. There are 60 minutes in an hour.
Q.5. Define temperature.
Ans. Temperature is defined as the degree of hotness or coldness of a body.
02/11/2021
CHAPTER 11 SOUND AND NOISE
Answer the following:-
Q.1. How is sound produces from our mouth?
Ans. When we speak our tongue vibrates and sound is produced.
Q.2. Give three ways how plants produce sound.
Ans. Three ways how plants produced sounds are:-
1) It produced sound by rattling of their leaves when air blows.
2) When twigs, branches and fruits fall down from the leaves.
3) When animals and birds make their way through the leaves and branches.
Q.3. Give any three ways to reduce noise pollution.
Ans. Three ways to reduce noise pollution are:-
1) We should not play the television, radio or music player at loud volumes.
2) Try to blow horn only when necessary.
3) Loud speakers should be avoided.
Q.4. What does loud sounds cause?
Ans. Loud sounds can damage our ears and may cause permanent deafness.
28/10/2021
CHAPTER 10: SAVE NATURAL RESOURCES
Answer the following:-
Q.1. Give the importance of soil.
Ans. Soil is an important natural resources because we grow grains, vegetables and other plants on it. It also provides shelter to a number of insects and animals.
Q.2. What are natural resources?
Ans. The resources present naturally on earth are known as natural resources.
Q.3. What do you understand by fossil fuels?
Ans. The remains of plants and animals which were buried deep under the earth got converted into fossil fuels. These fuels contain a lot of energy.
Q.4. Define air pollution.
Ans. The process by which the clean air gets contaminated with other gases, dust and chemicals is called air pollution.
Q.5. Name some fossil fuels.
Ans. Some fossil fuels are coal, charcoal, petrol, diesel etc.
05/10/2021
CHAPTER 9: SEASONS AND ITS IMPACT
Answer the following:-
Q.1. If the earth stops rotating on its axis, what kind of changes would you expect?
Ans. If the earth stops rotating on its axis, then the phenomenon of day and night would not occur. The part facing the sun will have day forever and the part facing away from the sun will have night forever.
Q.2. What is solar year?
Ans. Earth takes 365 1/4 days to complete one revolution. This time period is called a solar year.
Q.3. What would happen if the axis of earth was not tilted?
Ans. If the axis of the earth was not tilted the distance of the South pole and the north pole from the sun would have been the same. Both the hemispheres would have received the same amount of heat. There would have been no change of season.
Q.4. What is the basic cause of floods in interior areas?
Ans. In the interior areas floods are caused due to continuous burst of rainfall or a cloud burst which makes the soil incapable of holding any more water and thus, the water enters the cities and submerges it.
Q.5. Give three ways in which droughts can be prevented.
Ans. Three ways in which droughts can be prevented are:-
1. It can be prevented by growing more trees as the roots have the capacity to hold water.
2. During transpiration trees gives out water vapours and help in giving moisture to the air to cause rain.
3. We should also develop means to harvest rainwater which can be used in case of droughts and hence we can reduce its harmful impact.
26/08/2021
CHAPTER 8: WATER
Answer the following:-
Q.1. Differentiate between surface and Underground water.
Ans. Water which is present on the surface of the earth is called surface water. Whereas, the water which collects over the hard rock below the earth is called underground water.
Q.2. Why is underground water considered to be clean water?
Ans. Underground water is considered to be clean water as it is free from suspended impurities because it is filtered by nature as it passes through several layers of the soil.
Q.3. What is water cycle?
Ans. Circulation of water from the earth's surface to the atmosphere and back to the earth is called the water cycle.
Q.4. Define the following:
a) Solvent
b) Solute
c) Unsaturated Solution
d) Saturated Solution.
Ans. a) Solvent: A liquid which dissolves other substances in it is called solvent.
b) Solute: A substance which dissolves in liquid is called solute.
c) Unsaturated Solution: A Solution which has less amount of Solute is known as unsaturated Solution.
d) Saturated Solution: A Solution which has large amount of Solute is known as saturated solution.
03/08/2021
CHAPTER 7: STATES OF MATTER
Answer the following:-
Q.1. Define matter.
Ans. Matter is anything that has weight and occupies space. Everything you can see and touch is made up of matter.
Q.2. Why does a hydrogen filled balloons rise?
Ans. Balloon filled with Hydrogen rises because hydrogen gas is light than air.
Q.3. Define liquid state.
Ans. If molecules are present away from each other then it is liquid in state.
Q.4. Which state has a definite shape?
Ans. Solids have a definite shape.
08/07/2021
CHAPTER 6: INSECTS
Answer the following:-
Q.1. Give three steps to get rid of unwanted insects.
Ans. Three steps to get rid of unwanted insects are:-
1) Hair should be kept clean by washing and regular combing.
2) Moth balls or dried neem leaves should be kept with silk or woolen clothes.
3) We should spray chemicals like D.D.T and other insecticides in the places where insects live.
Q.2. Name four harmful insects.
Ans. Four harmful insects are grasshoppers, beetles, locusts and mosquitoes.
Q.3. Give two important products given by bees.
Ans. Two important products given by bees are wax and honey.
Q.4. Why insects do not fly like birds?
Ans. Insects do not fly like birds because most of the insects have wings which are not very muscular.
Q.5. How does a butterfly suck nectar?
Ans. Butterflies have a long sucking tube in their mouth called proboscis. It uses this tube to suck nectar from a flower.
01/07/2021
CHAPTER 5: BIRDS AND THEIR CLAWS
Answer the following:-
Q.1) Describe the nest of bulbul?
Ans) Bulbul birds uses dry grass to build its nest in hedges and bushes. It looks like a deep cup.
Q.2) How does duck swim in water?
Ans) Ducks use their webbed feet to swim in the water. Their webbed feet help them to paddle and push water while swimming.
Q.3) Give two functions of feet and claws.
Ans) The two functions of feet and claws are:
1) Feet help the birds to walk and run on the ground.
2) Claws help the birds to hold the branch and claws also help them to protect themselves.
Q.4) Name two preying birds. Give a special feature of preying bird.
Ans) Eagles and hawks are two preying birds. They have strong and sharp claws that are called talons to catch and hold their prey.
Q.5) Why do birds make a nest? What is a nest made up of?
Ans) Birds make a nest to live, to lay eggs and to keep their young ones safe and warm. Nests are made up of grass, twigs, feathers, papers, old clothes, rags, cotton, wool, mud and leaves.
15/06/2021
CHAPTER 4: BIRDS AND THEIR BEAKS
Answer the following:-
Q.1) How does a bird fly?
Ans) A bird flies with the help of wings attached to its body.
Q.2) What is the shape of a birds body?
Ans) Birds have light bodies . They have well formed wings attached to their body with the help of strong muscles.
Q.3) Why Ostrich and penguin cannot fly?
Ans) Ostrich and penguin cannot fly because they are too heavy to fly.
Q.4) Name three different kinds of beak.
Ans) Three different kinds of beaks are:
a) Pointed beak
b) Curved beak
c) Hooked beak
Q.5) How does a swallow catch insects?
Ans) A swallow has a broad and short beak. Its beak is sticky from inside. It moves round and round in the air with its beak open and tiny flying insects get stuck inside its beaks.
03/06/2021
CHAPTER 3: PLANTS
Answer the following:-
Q.1) Why are flower colourful?
Ans. Flowers are colourful to attract birds and insects for pollination and collecting nectar. It also makes the plant look attractive.
Q.2) What feature make leaf absorb maximum sunlight?
Ans. The leaf absorbs maximum sunlight due to its flat surface called leaf blade.
Q.3) Give three functions of stem.
Ans. Three functions of a stem are:-
1) The stem holds up leaves and flowers.
2) It carries water to all parts of the plant.
3) Hard stems support the plant.
Q.4) What is a seed? What does it contain?
Ans. Seeds are the hard structures present in a fruit. It contains a tiny baby plant in it.
Q.5) What does the baby plant need to grow?
Ans. The baby plant needs a proper amount of sunlight, air, water and minerals from the soil to grow.
27/05/2021
CHAPTER 2: THE RESPIRATORY SYSTEM
Answer the following:-
Q.1) What is Respiration?
Ans. The process of breaking down the complex food substances with the help of oxygen and releasing energy is known as Respiration.
Q.2) Name the Organ that comprise the respiratory system.
Ans. The Organ that comprises the respiratory system are nose, nasal passage, windpipe and lungs.
Q.3) What is Breathing?
Ans. Breathing is inhalation and exhalation of air.
Q.4) What happens to the size of chest while inhaling and exhaling?
Ans. The size of the chest increases during inhalation and it decreases during exhalation.
Q.5) What is the breathing rate?
Ans. Breathing rate is the number of times we breathe in and breathe out in one minute under different conditions.
06/05/2021
CHAPTER 1: OUR BODY SYSTEMS
Answer the following:-
Q.1. What is the function of blood?Ans. Blood flows through blood vessels. It carries oxygen and digested food to all parts of the body.
Q.2. What is respiration?
Ans. The process which releases energy in our body is known as respiration.
Q.3. What is digestion?
Ans. Breaking down of complex food into simple food is known as digestion.
Q.4. Why should we breathe through nose?
Ans. Our nose contains small hairs which act as a filter for dust and other particles. Hence, only clean air enters our lungs.
Q.5. What does a nervous system comprise of?
Ans. The nervous system comprises of the brain, the spinal cord and the nerves.
No comments:
Post a Comment