In plants, water is transported through

1

(a)

xylem

(b)

phloem

(c)

stomata

(d)

root hair

Water absorption through roots can be increased by keeping the plants

1

(a)

in the shade

(b)

in dim light

(c)

under the fan

(d)

covered with a polythene bag

The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in

1

(a)

veins

(b)

arteries

(c)

heart

(d)

capillaries

A certain type of cells helps in destruction of disease-causing microorganisms are known as

1

(a)

thrombocytes

(b)

white blood cells

(c)

osteocytes

(d)

red blood cells

The lower chambers of heart is called

1

(a)

atria

(b)

ventricles

(c)

aorta

(d)

vena cava

Haemoglobin is present in __________ cells.

1

(a)

Red Blood Cells (RBCs)

Blood consists of _______, _______, ________ and platelets.

1

(a)

plasma, RBCs, WBCs

The _________ is an organ which beats continuously to act as a __________.

1

(a)

heart, pump

The parts or organs involved in excretion to form the _________.

1

(a)

excretory system

The function of kidney is to filter the _____________ to remove ________.

1

(a)

blood, urea

The vascular tissue for the transport of food in plants is called xylem.

1

(a) True

(b) False

Haemoglobin is the red colour pigment present in blood.

1

(a) False

(b) True

WBC protects the body from diseases.

1

(a) False

(b) True

The process of cleaning the blood of human by using a kidney machine is called dialysis.

1

(a) False

(b) True

Sweat is secreted by sweat glands, present in our skin.

1

(a) False

(b) True

What will happen if the blood rich in oxygen and the blood rich in carbon dioxide mix with each other?

1

(a)

The net oxygen content of blood will fall and hence body will suffer from oxygen deficiency.

Boojho wonders if sponges and hydra also have blood?

1

(a)

No

Paheli wants to know whether other animals also urinate?

1

(a)

Yes.

Boojho wants to know why plants absorb a large quantity of water from the soil, then give it off by transpiration?

1

(a)

Because transpiration helps in suction of water.

What are the components of blood?

1

(a)

Red blood cells, white blood cells, platelets and plasma.

Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?

2

(a)

Blood is a fluid connective tissue. Justify.

2

(a)

Urine is called an excretory product. Why?

2

(a)

Why is transport of materials necessary in a plant or in an animal? Explain.

3

(a)

Why is it necessary to excrete waste products?

3

(a)

Name the tissues of a plant which carries
(a) water and minerals from roots to the leaves.
(b) food from the leaves to the other parts of the plant.

3

(a)

While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime.
(a) Why did the bleeding stop?
(b) What would be the colour of the wounded area and why?
(c) Which type of blood cells are responsible for clotting of blood?

5

(a)

Record your own pulse rate and heartbeat and that of your friends while resting and after running and record in Table.

5

(a)