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Page No 223:

Question A.1:

Which of the following organs does not come under respiratory system?
(a) larynx
(b) trachea
(c) heart
(d) bronchi

Answer:

(c) heart
    The heart is a part of the circulatory system.

Page No 223:

Question A.2:

Blood does not consist of one of the following components.
(a) plasma
(b) capillaries
(c) W.B.C.
(d) R.B.C.

Answer:

(b) capillaries
    Capillaries are blood vessels. They are not a component of blood.

Page No 223:

Question A.3:

..................... contains the pollen grains in a flower.
(a) anther
(b) pedicel
(c) pistil
(d) style

Answer:

(a) anther
    Anther contains the pollen grains in a flower.

Page No 223:

Question A.4:

Which one of the following is a scalar quantity?
(a) weight
(b) force
(c) velocity
(d) mass

Answer:

(d) mass
    Mass is a scalar quantity as it has only magnitude, but no direction.

Page No 223:

Question A.5:

The device used to close or open an electric is a
(a) switch
(b) resistance
(c) fuse
(d) ammeter

Answer:

(a) switch
    A switch is used to open or close an electrical circuit.

Page No 223:

Question B:

Fill in the blanks:
1. Breathing involves .......................... and .......................... .
2. Veins have .......................... which allow blood to flow only towards the heart.
3. Internal respiration occurs inside the .......................... .
4. The metallic ball in a simple pendulum is called is called the .......................... .
5. Seedless plants can grow through .......................... .

Answer:

  1. Breathing involves inhalation and exhalation.
  2. Veins have valves that allow blood to flow only towards the heart.
  3. Internal respiration occurs inside the cell.
  4. The metallic ball in a simple pendulum is called is called the bob.
  5. Seedless plants can grow through vegetative propagation.

Page No 223:

Question C:

Match the columns:

Column A Column B
1. Fern (a) Pendulum
2. Solenoid (b) Male gametes
3. Bob (c) Stomata
4. Pollens (d) Spores
5. Transpiration (e) Electromagnet

Answer:

Column A Column B
1. Fern (d) Spores
2. Solenoid (e) Electromagnet
3. Bob (a) Pendulum
4. Pollens (b) Male gametes
5. Transpiration (c) Stomata

Page No 223:

Question D:

Write True (T) or False (F):
1. The process of giving out air is known as exhalation. ( )
2. The upper two chambers of the heart are called ventricles. ( )
3. Reproduction through fragmentation takes place in spirogyra. ( )
4. Earlier people measured time by simply looking at the sun and the moon. ( )
5. The current flows only if the circuit is open. ( )

Answer:

1. (T)

2. (F)
    The upper two chambers of the heart are called auricles.

3. (T)

4. (T)

5. ​(F)
    Current flows only through closed circuits.



Page No 224:

Question E:

Name two applications of:

1. Heating effect of current. .................... ....................
2. Lighting effect of current. .................... ....................
3. Magnetic effect of current. .................... ....................

Answer:

  1. Water heater, Electric cooker
  2. Light bulb, Tube light
  3. Door bell, Solenoid

Page No 224:

Question F:

Give examples of plants showing vegetative propagation:
1. By modified stems:

(a) Tuber .................... ....................
(b) Bulb .................... ....................
(c) Rhizome .................... ....................
(d) Corm .................... ....................
2. By modified roots: .................... ....................
3. By leaves: .................... ....................

Answer:

  1. Stems:
    1. Potato, Yam
    2. Tulip, Garlic
    3. Turmeric, Ginger
    4. Chinese water chestnut, Colocasia
  2. Roots: Carrot, Dahlia
  3. Leaves: Bryophyllum, Begonia

Page No 224:

Question G.1:

How does RBC carries oxygen to the cells?

Answer:

RBCs contain haemoglobin that binds to oxygen. This oxygen is then carried to all the cells inside the body.

Page No 224:

Question G.2:

How does ascent of sap occurs in plants?

Answer:

The water and minerals absorbed by the roots are called sap. The upward movement of the sap from the roots to the leaves is known as the ascent of sap. It is driven by a transpirational pull. It is when most of the water drawn up from the roots evaporates from the leaves, which causes the roots to absorb more water. 

Page No 224:

Question G.3:

What is the function of pollens in flowering plants?

Answer:

Pollen in flowering plants carry the male gametes. The function of pollens is to transfer the male gametes to the stigma, where they fertilise the ovule.

Page No 224:

Question G.4:

A man covers a total distance of 900 km in his motorbike with an average speed of 45 km/h. How much time does he take?

Answer:

To solve this problem, we use the formula: 

Speed = DistanceTime

Speed of motorbike = 45 km/h
Distance = 900 km.

∴ Time = DistanceSpeed=900 km45 km/h=20 h

So, the man takes 20 hours to cover 900 km, riding at a speed of 45 km/h on his motorcycle.

Page No 224:

Question G.5:

Why on doing exercise muscle fatigue occurs?

Answer:

Upon exercising, we use the glycogen stored in the muscles for procuring energy. The muscle is then deplete of glycogen, and lactic acid builds up in the muscle, leading to soreness and muscle fatigue.

Page No 224:

Question H.1:

How will you experimentally prove that leaves actually transpire?

Answer:


Take a potted plant and cover a green branch with a plastic bag, carefully securing the mouth of the bag. After some time, you will observe droplets of water forming on the inner surface of the plastic bag. This is water that is transpired by the leaves. This experiment shows that leaves transpire.

Page No 224:

Question H.2:

Why fuse wire has low melting point? Give reasons for melting of fuse wires.

Answer:

A fuse wire is a safety device that prevents excess current from flowing through and damaging electrical equipment. When the fuse wire melts, it creates an open circuit and protects electrical equipment. As a result it has a low melting temperature. A fuse wire melts due to excess heating caused by a high current.

Page No 224:

Question H.3:

How is fertilization brought about in a flower?

Answer:

Fertilization in flowers occurs  the following steps:

  1. Pollen grains become lodged in the stigma during pollination
  2. The pollen tubes grow through the stigma, down the style and into the ovule.
  3. The pollen tube carries at its end two male gametes, which are released in the ovule.
  4. One of the male gametes fuses with the egg to form a zygote, completing the process of fertilization.

Page No 224:

Question H.4:

What is the role of stomatal apparatus in plant respiration?

Answer:

The stomatal apparatus in plants consists of two guard cells and several subsidiary cells. Guard cells expand or contract when water flows in or out of them, respectively. The stomatal opening also allows an exchange of gases with the surroundings. Due to this, we may say that stomata in plants are analogous to nostrils in animals.



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