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Page No 105:

Question A.1:

The minor component of a solution is
(a) solvent
(b) solute
(c) solution
(d) filtrate
 

Answer:

(b) solute

The solute is a minor component of a solution, and it is dissolved in a solvent to make a solution.

Page No 105:

Question A.2:

Conditions which favour changes are
(a) light
(b) electricity
(c) pressure
(d) all the three

Answer:

(c) pressure

Pressure favours changes as it brings the molecules reacting closer to one another.

Page No 105:

Question A.3:

Ovules of a flower are present in the
(a) stamen
(b) pedicel
(c) ovary
(d) style

Answer:

(c) ovary

The ovules of a flower are present in the ovary.

Page No 105:

Question A.4:

Patella is located on a/an
(a) knee
(b) ankle
(c) wrist
(d) palm

Answer:

(a) knee

The patella is present on the knee and is called the kneecap.

Page No 105:

Question A.5:

Each carpel of a flower consists of
(a) ovary
(b) style
(c) stigma
(d) all the thee

Answer:

(d) all the three

Each carpel has an upper stigma, a middle style and a lower ovary.

Page No 105:

Question B:

Fill in the blanks:
1. The process in which a liquid changes into its vapour state is called ............................ .
2. In a ............................ change physical pro
3. ............................ in a seeding grows into the soil.
4. Ostrich is a ............................ bird.
5. The arrangement of veins on the leaf blade is called ............................ .

Answer:

1. The process in which a liquid changes into its vapour state is called vaporisation .
2. In a reversible change physical properties of the substance change.
3. Roots in a seedling grows into the soil.
4. Ostrich is a flightless bird.
5. The arrangement of veins on the leaf blade is called venation.

Page No 105:

Question C:

Match the columns:

Column A Column B
1. Synovial fluid (a) Creeper
2. Bottlegourd (b) Stamen
3. Lamina (c) Arm bone
4. Androecium (d) Joint
5. Humerus (e) Leaf

Answer:

Column A Column B
1. Synovial fluid (d) Joint
2. Bottlegourd (a) Creeper
3. Lamina (e) Leaf
4. Androecium (b) Stamen
5. Humerus (c) Arm bone

Page No 105:

Question D:

Write True (T) or False (F):
1. Threshing and winnowing are two separation techniques used in agriculture. ( )
2. Drying of wet clothes is an irreversible change. ( )
3. Eucalyptus is a shrub. ( )
4. The body of an earth worm is made up of a large number of segments. ( )
5. There are two pairs of floating ribs in our chest bones. ( )

Answer:

1. True (T)

2. False (F)

 It is a reversible change.

3. False (F )

The eucalyptus is a tree.

4. True (T)

5. True (T)



Page No 106:

Question E:

Define the following in not more than ten words.
1. Shoots system : ...............................................................
2. Venation : ...............................................................
3. Invertebrates : ...............................................................
4. Joint : ...............................................................
5. Tendon : ...............................................................
6. Supernatant : ...............................................................
7. Herbs : ...............................................................
8. Thalamus : ...............................................................
9. Pollination : ...............................................................
10. Fertilisation : ...............................................................

Answer:

1. Shoots system : The aerial part of a plant having stem-bearing leaves, flowers and fruits.

2. Venation : The arrangement of veins on the leaves of plants.

3. Invertebrates : Animals that do not posses a vertebral column.

4. Joint : A place where two or more bones meet.

5. Tendon : A tissue that connects muscle to bone.

6. Supernatant : The clear liquid above the sediment.

7. Herbs : Small plants with soft, green stems.

8. Thalamus : The swollen part of a pedicel.

9. Pollination : The transfer of pollens from the anther to the stigma.

10. Fertilisation : The fusion of an egg and a sperm.

Page No 106:

Question F:

Match the words with the correct figures and mention their functioning.
Pelvic girdle  Ball-and-socket joint  Pectoral girdle  Hinge joint  Pivot joint

Figure  a. ___________________

Figure  b. ___________________

Figure  c. ___________________

Figure  d. ___________________

Answer:

a. Ball and socket joint: Allows movement in all directions.

b. Hinge joint: Allows movement in one direction only.

c. Pectoral girdle: Supports the bones of the arms.

d. Pelvic girdle: Supports the bones of the legs.



Page No 107:

Question G.1:

How is winnowing done?

Answer:

Winnowing is done by allowing a mixture of grain and husk to fall from a height. The grain is heavier, so it falls vertically to the ground. The husk, being lighter, is carried away by the wind and forms a heap at a short distance. Thus, winnowing separates the grain from the husk.

Page No 107:

Question G.2:

Give two examples each of reversible and irreversible changes.

Answer:

Reversible reactions: Melting of ice; drying of clothes

Irreversible reactions: Formation of a plant from its seed; rusting of iron

Page No 107:

Question G.3:

Is it possible to grow plants without sunlight?

Answer:

Plants can survive only for a short period without sunlight. They need sunlight to make their food and to obtain energy. Thus, it is not possible to grow plants without sunlight.

Page No 107:

Question G.4:

How does a fish move?

Answer:

A fish moves with the help of its fins.

When a fish swims in water, the muscles that cover its skeleton cause the front part of its body to curve towards one side. On the other hand, the tail (with the fins) curves towards the opposite side. Then, the body and the tail curve towards the other side. This causes a jerking movement, which pushes the body to move forward. Many such jerking movements in succession help the fish to move forward.

Page No 107:

Question H.1:

How will you separate a mixture of common salt, sand and iron fillings?

Answer:

We can use a magnet to separate the iron fillings from the mixture of common salt, sand and iron fillings. Sand and salt can be separated by adding them to water, and allowing the salt to dissolve and the sand to settle. When the water is decanted, sand is left behind. By boiling the decanted water and letting it evaporate, salt can be obtained.

Page No 107:

Question H.2:

How can you  say that interaction is essential for change?

Answer:

A change requires the interaction of two or more substances. For example, for a matchstick to light up, it needs to be struck against the rough side of a matchbox.

Page No 107:

Question H.3:

Describe an activity to show that roots help in absorption.

Answer:

In order to show that the roots of plants help them to absorb water, fill a pot with soil. Bring four plants from a nursery. Cut off the roots of two plants. Plant all the four plants in the pot. The plants without roots dry up and die in a few days, showing that they need roots to absorb water, and the plants with roots remain healthy.

Page No 107:

Question H.4:

State four important function of human skeleton.

Answer:

The important functions of the human skeleton are as follows.

  • It provides shape and structure to the body.
  • It helps in movement and locomotion.
  • It protects the soft parts of the body, such as the heart and the brain.
  • The marrow in the bones in the skeleton helps in the formation of blood.



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