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Q4. Answer the following:

(c) Why can our elbow not move backwards?

 

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P Pankaj Sanodiya
Answered Jul 07, 2019

Our elbow cannot move backward because the elbow has a hinge joint that allows movement in only one direction.

Q4. Answer the following:

(b) Which of the skull bones are movable?

 

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P Pankaj Sanodiya
Answered Jul 07, 2019

 Mandible bone which forms the lower jaw is the only skull bone that is movable. The elbow has a hinge joint. This type of joint allows the movement in one plane only. Therefore, our elbow cannot move backward.

 

Q4. Answer the following:

(a) What is a ball and socket joint?

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P Pankaj Sanodiya
Answered Jul 07, 2019

A ball and socket joint is a type of synovial joint, such as the hip and shoulder joints. In this type of joint, one bone has a smooth, ball-shaped head that fits into a cuplike socket on the other end. In the hip, the head of the femur has a hemispherical shape that fits in the cuplike socket of the acetabulum of the pelvis. This type of joint is one of the most moveable joints in the body.

Q3. Match the items in Column I with one or more items of Column II.

Column I Column II
Upper jaw have fins on the body
Fish has an outer skeleton
Ribs can fly in the air
Snail is an immovable joint
Cockroach protect the heart
  shows very slow movement
  have a streamlined body

 

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P Pankaj Sanodiya
Answered Jul 07, 2019

The Matched column is :

\begin{array}{ll}{\text { Column } 1} & {\text { Column II }} \\ {\text { Upper jaw }} & {\text { have fins on the body }} \\ {\text { Fish }} & {\text { have fins on the body }} \\ {\text { Ribs }} & {\text { can fly in the air }} \\ {\text { Snail }} & {\text { is an immovable joint }} \\ {\text { cockroach }} & {\text { shotect the heart }} \\ {} & {\text { shows very slow movement have a streamlined body }} \\ {\text { }}\end{array}

Q2. Indicate true (T) and false (F) among the following sentences.

(a) The movement and locomotion of all animals is exactly the same. ( )

(b) The cartilages are harder than bones. ( )

(c) The finger bones do not have joints. ( )

(d) The fore arm has two bones. ( )

(e) Cockroaches have an outer skeleton. ( )

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P Pankaj Sanodiya
Answered Jul 07, 2019

(a) False

(b) False

(c) False

(d) True

(e) True

Q1. Fill in the blanks:

(a) Joints of the bones help in the ——————— of the body.

(b) A combination of bones and cartilages forms the _______ of the body.

(c) The bones at the elbow are joined by a ______________________ joint.

(d) The contraction of the _____________ pulls the bones during movement.

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P Pankaj Sanodiya
Answered Jul 07, 2019

a. movement,

b. skeleton,

c. hinge,

d. muscles.

Q7. 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.

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G Gautam harsolia
Answered May 05, 2019

a) Baby, as it is not made up of wood.

b) Boat, as it is not a flower.

c) Sand, as it is not a metal.

d) Sand, as it is not soluble in water.

 

Q6. List all items known to you that float on water. Check and see if they will float on an oil or kerosene.

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G Gautam harsolia
Answered May 05, 2019

Here are some of the items which float on water:

(i) Wood

(ii) Leaves

(iii) Plastic balls

(iv) Thermocol

(v) Feather

(vi) Boat

All the above will float on an oil or kerosene.

 

Q5. Given below are the names of some objects and materials:

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

Group them as:

(a) Round shaped and other shapes

(b) Eatables and non eatables

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G Gautam harsolia
Answered May 05, 2019

(a) Round shaped and other shapes:

Rounded shaped other shapes
basket ball sugar
orange apple
globe  
earthen pitcher  

 

(b) Eatables and non-eatables:

Eatables Non-eatables
water basket ball
orange globe
sugar earthen pitcher
apple  

 

 

Q4. 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.

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G Gautam harsolia
Answered May 05, 2019

(i) False, stone is opaque, while glass is transparent.

(ii) False, neither of them have lustre.

(iii) False, chalk does not dissolve in water rather it makes a suspension.

(iv) True, a piece of wood floats on water.

(v) False, sugar dissolves in water.

(vi) False, oil does not mix with water rather it makes an emulsion.

(vii) True, sand settles down in water.

(viii) True, vinegar gets dissolves in water.

 

Q3. Match the objects given below with the materials from which they could be made. Remember, an object could be made from more than one material and a given material could be used for making many objects.

Objects  Materials
Book Glass
Tumbler Wood
Chair Paper
Toy Leather
Shoes Plastics

 

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G Gautam harsolia
Answered May 05, 2019

Answers:

Objects  Materials from which they could be made
Book Paper, wood
Tumbler Glass, wood, plastic
Chair Wood, Plastic
Toy Glass, wood, paper, plastics, leather
Shoes Leather, plastic

 

Q2. Select those objects from the following which shine:

Glass bowl, plastic toy, steel spoon, cotton shirt

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G Gautam harsolia
Answered May 05, 2019

Objects which shines are:

Glass bowl and steel spoon, they are lustrous.

Q1. Name five objects which can be made from wood.

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G Gautam harsolia
Answered May 05, 2019

Five objects which can be made from wood are:

(i) Table

(ii) Chair

(iii) Doors

(iv) Bullock Cart

(v) Pencil.

Q9. How do plants and animals help each other in the exchange of gases in the atmosphere?

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G Gautam harsolia
Answered May 05, 2019

It is obvious that animals cannot live without plants. The balance of oxygen and carbon dioxide in the atmosphere is maintained through respiration in plants and animals and by the photosynthesis in plants. In photosynthesis, plants take in carbon dioxide and give out oxygen that animals consume and give out carbon dioxide. This shows the interdependence of plants and animals.

Q8. List five activities that are possible due to the presence of air.

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G Gautam harsolia
Answered May 05, 2019

Five activities that are possible due to the presence of air are:

(i) Flying of birds  (ii) Respiration  (iii) Cloud formation (iv) Burning something (v) Winnowing.

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