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    • Question 1 :

      Do you find that all living beings need the same kind of food?

      No. Different animals eat different kinds of food as per their body structure and internal organs. Depending on kind of food they eat, animals are divided into three basic categories:

      Herbivores: Animals which feed on plants and plant products are called herbivores.

      Examples: cow, goat, elephantdear, etc.

      Carnivores: Animals which feed on other animals are called carnivores.

      Examples: lion, tiger, fox, etc.

      Omnivores: Animals which feed on both plants and animals are called omnivores.

      Examples: crow, cat, dog, etc.

      Question 2 :

      Name five plants and their parts that we eat.

      Apple – Fruit

      Mango - Fruit

      Potato - Stem

      Carrot - Root

      Spinach – Leaf

      Wheat - Seed

      Cauliflower – Flower

      Question 3 :
      Question 4 :

      Fill up the blanks with the words given: herbivore, plant, milk, sugarcane, carnivore

      (a)Tiger is a ____________________ because it eats only meat.

      (b)Deer eats only plant products and so, is called ______________.

      (c)Parrot eats only _________________ products.

      (d)The ________________ that we drink, which comes from cows, buffaloes and goats is an animal product.

      (e)We get sugar from ___________________.

      (a)Tiger is a carnivore because it eats only meat.

      (b)Deer eats only plant products and so, is called herbivore.

      (c)Parrot eats only plant products.

      (d)The milk that we drink, which comes from cows, buffaloes and goats is an animal product.

      (e)We get sugar from sugarcane.

    • Question 1 :

      Name the major nutrients in our food.

      The major nutrients in our food are named carbohydratesproteins, fats, vitamins and minerals. In addition, food contains dietary fibres and water which are also needed by our body.

      Question 2 :

      Name the following:

      (a)The nutrients which mainly give energy to our body.

      (b)The nutrients that are needed for the growth and maintenance of our body.

      (c)A vitamin required for maintaining good eyesight.

      (d)A mineral that is required for keeping our bones healthy.

      (a)The nutrients which mainly give energy to our body – Carbohydrates and Fats

      (b)The nutrients that are needed for the growth and maintenance of our body - Proteins

      (c)A vitamin required for maintaining good eyesight - Vitamin A

      (d)A mineral that is required for keeping our bones healthy – Calcium

      Question 3 :

      Name two foods each rich in:

      (a) Fats

      (b) Starch

      (c) Dietary fibre

      (d) Protein

      (a) Fats

      : Ghee, Butter, Milk, Egg etc.

      (b) Starch

      : Potatoes, Sugar, Rice etc.

      (c) Dietary fibre

      : Vegetables, Fresh fruits etc.

      (d) Protein

      : Milk, Beans, Egg, Cheese etc.

      Question 4 :

      Tick (√) the statements that are correct.

      (a)By eating rice alone, we can fulfil nutritional requirement of our body. ( )

      (b)Deficiency diseases can be prevented by eating a balanced diet. ( )

      (c)Balanced diet for the body should contain a variety of food items. ( )

      (d)Meat alone is sufficient to provide all nutrients to the body. ( )

      (a)By eating rice alone, we can fulfil nutritional requirement of our body. (X)

      (b)Deficiency diseases can be prevented by eating a balanced diet. ()

      (c)Balanced diet for the body should contain a variety of food items. ()

      (d)Meat alone is sufficient to provide all nutrients to the body. (X)

      Question 5 :

      Fill in the blanks.

      (a)______________ is caused by deficiency of Vitamin D.

      (b)Deficiency of ______________ causes a disease known as beriberi.

      (c)Deficiency of Vitamin C causes a disease known as ______________.

      (d)Night blindness is caused due to deficiency of ____________ in our food.

      (a)Rickets is caused by deficiency of Vitamin D.

      (b)Deficiency of vitamin B1 causes a disease known as beriberi.

      (c)Deficiency of Vitamin C causes a disease known as scurvy.

      (d)Night blindness is caused due to deficiency of vitamin A in our food.

    • Question 1 :

      Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, polyester, jute

      Natural Fibres

      : wool, cotton, silk, jute

      Synthetic Fibres

      : nylon, polyester

      Question 2 :

      State whether the following statements are true or false:

      a)Yarn is made from fibres.

      b)Spinning is a process of making fibres.

      c)Jute is the outer covering of coconut.

      d)The process of removing seed from cotton is called ginning.

      e)Weaving of yarn makes a piece of fabric.

      f)Silk fibre is obtained from the stem of a plant.

      g)Polyester is a natural fibre.

      a) Yarn is made from fibres.

      (True)

      b) Spinning is a process of making fibres.

      (False)

      c) Jute is the outer covering of coconut.

      (False)

      d) The process of removing seed from cotton is called ginning. (True)

      e) Weaving of yarn makes a piece of fabric.

      (True)

      f) Silk fibre is obtained from the stem of a plant.

      (False)

      g) Polyester is a natural fibre.

      (False)

      Question 3 :

      Fill in the blanks:

      a)Plant fibres are obtained from_________ and ________ .

      b)Animals fibres are __________ and ___________ .

      a)Plant fibres are obtained from jute and cotton.

      b)Animals fibres are silk and wool.

      Question 4 :

      From which parts of the plant cotton and jute are obtained?

      Cotton is obtained from the fruits of the cotton plantcalled cotton balls. Jute fibre is obtained from the stem of the jute plant.

      Question 5 :

      Name two items that are made from coconut fibre.

      Jute bags, ropes and Foot mats.

      Question 6 :

      Explain the process of making yarn from fibre.

      The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton are drawn out and twisted. This brings the fibres together to form a yarn. Spinning is done at home using simple devices like hand spindle (Takli) and charkha. On large scale big spinning machines are used.

    • Question 1 :

      Name five objects which can be made from wood.

      Table, Chair, Bed, Doors, Bullock cart etc.

      Question 2 :

      Select those objects from the following which shine:

      Glass bowl, plastic toy, steel spoon, cotton shirt

      Glass bowl and steel spoon.

      Question 3 :
      Question 4 :

      State whether the statements given below are True or False.

      (i)Stone is transparent, while glass is opaque.

      (ii)A notebook has lustre while eraser does not.

      (iii)Chalk dissolves in water.

      (iv)A piece of wood floats on water.

      (v)Sugar does not dissolve in water.

      (vi)Oil mixes with water.

      (vii)Sand settles down in water.

      (viii)Vinegar dissolves in water.

      (i) Stone is transparent, while glass is opaque.

      (False)

      (ii) A notebook has lustre while eraser does not.

      (False)

      (iii) Chalk dissolves in water.

      (False)

      (iv) A piece of wood floats on water.

      (True)

      (v) Sugar does not dissolve in water.

      (False)

      (vi) Oil mixes with water.

      (False)

      (vii) Sand settles down in water.

      (True)

      (viii) Vinegar dissolves in water.

      (True)

      Question 5 :

      Water, basket ball, orange, sugar, globe, apple and earthen pitcher

      Group them as:

      (a)Round shaped and other shapes

      (b)Eatables and non eatables

      (a)

       

      Round shaped

      : Basket ball, orange, globe, apple and earthen pitcher

      Other shapes

      : Water and sugar

      (b)

       

      Eatables

      : Water, orange, sugar and apple

      Non eatables

      : Basket ball, globe and earthen pitcher

      Question 6 :

      List all items known to you that float on water. Check and see if they will float on an oil or kerosene.

      Wooden block, Paper, Balloon, Hair, plastic bottle, wooden logs, Boat etc. will float on water. A few of these like hair, balloon can float on kerosene or oil. Generally, substances have less density than oil and water can float.

      For example, few types of wood have densities higher than oil but less than water, so it floats on water but not on kerosene.

      Question 7 :

      Find the odd one out from the following:

      a)Chair, Bed, Table, Baby, Cupboard

      b)Rose, Jasmine, Boat, Marigold, Lotus

      c)Aluminium, Iron, Copper, Silver, Sand

      d)Sugar, Salt, Sand, Copper sulphate

      a)Baby: Rest others are made up of wood and are non – living things.

      b)Boat: Rest others are flowers.

      c)Sand: Rest others are metals.

      d)Sand: Rest others are in crystal forms.

    • Question 1 :

      Why do we need to separate different components of a mixture? Give two examples.

      Before using a substance, we need to separate harmful or non-useful substances that may be mixed with it. Sometimes, we separate even useful components if we need to use them separately.

      For example:

      We used to separate slightly larger sized impurities like the pieces of dirt, stone, and husk from wheat, rice or pulses by handpicking method.

      Rice or pulses are usually washed before cooking. When we add water to these, the impurities like dust and soil particles get separated.

      Question 2 :

      What is winnowing? Where is it used?

      Winnowing is the method of separating components of a mixture containing heavier and lighter components by wind or by blowing air. It is used to separate husk particles from seeds of grain.

      Question 3 :

      How will you separate husk or dirt particles from a given sample of pulses before Cooking?

      Husk or bigger pieces of dirt particles can be removed from a sample of pulses by handpicking.

      Question 4 :

      What is sieving? Where is it used?

      Sieving is the process of filtering components of a mixture of different sizes. Sieving allows fine particles to pass through the holes of the sieve, while the bigger impurities remain on the sieve.

      Sieving is used in flour mills to separate broken particles of grains from flour. It is also used at construction sites to separate lumps, smaller stones from the mixture of sand and cement.

      Question 5 :

      How will you separate sand and water from their mixture?

      To separate sand and water from their mixture, we follow the following steps:

      Leave mixture to stand undisturbed for some time in a container.

      Sand settles at the bottom of the container. It is called sedimentation.

      Gently pour the water in another container (called decantation).

      We may also use filter paper to remove fine particles of sand (called filtration)

      Question 6 :

      Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?

      Yes. Through sieving we can separate sugar mixed with wheat flour.

      Question 7 :

      How would you obtain clear water from a sample of muddy water?

      Following steps are required to obtain clear water from muddy water:

      Allow muddy water to stand undisturbed in a container.

      After sometime, mud settles at the bottom of the container. This process is called sedimentation.

      Upper layer is clear water.

      Pour the clear water gently in another container. This process is called decantation.

      To remove finer impurities we can filter this water again with the help of filter paper. This process is called filtration

      Question 8 :

      Fill up the blanks

      (a)The method of separating seeds of paddy from its stalks is called ___________.

      (b)When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ___________.

      (c)Salt is obtained from seawater by the process of ___________.

      (d)Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called ___________.

      (a)The method of separating seeds of paddy from its stalks is called threshing.

      (b)When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of churning.

      (c)Salt is obtained from seawater by the process of evaporation.

      (d)Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called sedimentation and decantation.

      Question 9 :

      True or false?

      (a)A mixture of milk and water can be separated by filtration.

      (b)A mixture of powdered salt and sugar can be separated by the process of winnowing.

      (c)Separation of sugar from tea can be done with filtration.

      (d)Grain and husk can be separated with the process of decantation.

      (a) A mixture of milk and water can be separated by filtration.

      (False)

      (b) A mixture of powdered salt and sugar can be separated by the process of

       

      winnowing.

      (False)

      (c) Separation of sugar from tea can be done with filtration.

      (False)

      (d) Grain and husk can be separated with the process of decantation.

      (False)

      Question 10 :

      Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?

      We should add sugar before adding ice.Sugar dissolves in warm water more quickly than in cold water. We can dissolve more sugar before mixing ice in water.

    • Question 1 :

      To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?

      Yes, by unfolding the dress this change can be reversed.

      Question 2 :

      You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?

      No, it cannot be reversed, so it is an irreversible change.

      Question 3 :
      Question 4 :

      A drawing sheet changes when you draw a picture on it. Can you reverse this change?

      It is all depends on situations:

      By erasing the drawing we can undo the change. For example, if we draw with the help of pencil, we can erase the drawing by using an eraser. Then, it is a reversible change.

      If we draw using a pen, we cannot erase the drawing. Then this change cannot be reversed, so it is irreversible change.

      Question 5 :

      Give examples to explain the difference between changes that can or cannot be reversed.

      Examples of Reversible Changes:

      Melting of Ice into water. By freezing the water we can obtain ice again.

      Folding a paper: By unfolding it, we can undo the change.

      Hot milk to cold milk: By boiling milk, we can make it warm.

      Example of Irreversible Changes:

      Burning of candle.

      Bursting of crackers.

      Cutting of trees.

      Question 6 :

      A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?

      When water is added to POP, it undergoes a chemical change. Its composition changes and is converted into another substance. Since it is a chemical change, so it cannot be reversed.

      Question 7 :

      A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?

      Due to water, cement hardens and its composition changes. Since it is a chemical change which cannot be reversed.

    • Question 1 :

      Correct the following statements and rewrite them in your notebook.

      (a)Stem absorbs water and minerals from the soil.

      (b)Leaves hold the plant upright.

      (c)Roots conduct water to the leaves.

      (d)The number of petals and sepals in a flower is always equal.

      (e)If the sepals of a flower are joined together, its petals are also joined together.

      (f)If the petals of a flower are joined together, then the pistil is joined to the petal.

      (a)Roots absorbs water and minerals from the soil.

      (b)Stem hold the plant upright.

      (c)Stem conduct water to the leaves.

      (d)The number of petals and sepals in a flower is not always equal.

      (e)If the sepals of a flower are joined together, its petals are separate and not joined together.

      (f)If the petals of a flower are joined together, then the pistil is not necessarily joined to the petal.

      Question 2 :
      Question 3 :

      Can you find a plant in your house or in your neighborhood, which has a long but a weak stem? Write its name. In which category would you classify it?

      Money Plant has a ling but weak stem. It is a climber.

      Question 4 :

      What is the function of a stem in a plant?

      Functions of stem in a plant:

      It holds the branches, leaves, flowers and fruits.

      The stem transports water and minerals from roots to the upper parts.

      It also transports the prepared food from leaves to other parts.

      Question 5 :

      Which of the following leaves have reticulate venation?

      Wheat, tulsi, maize, grass, coriander (dhania), China rose

      Tulsi, Coriander (Dhania) and China rose.

      Question 6 :

      If a plant has fibrous root, what type of venation do its leaves likely to have?

      Parallel venation.

      Question 7 :

      If a plant has leaves with reticulate venation, what kind of roots will it have?

      Taproot.

      Question 8 :

      Is it possible for you to recognize the leaves without seeing them? How?

      Yes. We can identify the type of leaves by looking at its roots. Plants having leaves with reticulate venation have tap roots while plants having leaves with parallel venation have fibrous roots.

      Question 9 :

      Write the names of the parts of a flower.

      The parts of a flower are sepals, petals, stamens and pistil.

      Question 10 :

      Which of the following plants have you seen? Of those that you have seen, which one have flowers?

      Grass, maize, wheat, chilli, tomato, tulsi, pipal, shisham, banyan, mango, jamun, guava, pomegranate, papaya, banana, lemon, sugarcane, potato, groundnut

      We have seen the following plants:

      Grass, maize, wheat, chilli, tomato, tulsi, pipal, banyan, mango, jamun, guava,

      papaya, banana, lemon, sugarcane, potato. Plants having flowers:

      Maize, wheat, chilli, tomato, tulsi, pipal, shisham, banyan, mango, jamun, guava, pomegranate, papaya, banana, lemon, potato.

      Question 11 :

      Name the part of the plant which produces its food. Name this process.

      Leaves produce food for plant with the process of photosynthesis.

      Question 12 :

      In which part of a flower, you are likely to find the ovary?

      Ovary is located in the lowermost and swollen part of the pistil of flower.

      Question 13 :

      Name two flowers, each with joined and separated sepals.

      Plants with joined sepals : Datura and Tomato flower.

      Plants with separated sepals : Lotus and Rose.

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