NCERT Exemplar solutions for Science [English] Class 7 chapter 11 - Transportation in Animals and Plants [Latest edition]

The muscular tube through which stored urine is passed out of the body is called 

They are pipe-like, consisting of a group of specialised cells. They transport substances and form two-way traffic in plants. Which of the following terms qualify for the features mentioned above?

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

In which of the following parts of the human body are sweat glands absent?

In a tall tree, which force is responsible for pulling water and minerals from the soil?

Aquatic animals like fish excrete their wastes in gaseous form as

Veins have valves that 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?

What is the special feature present in a human heart which does not allow the mixing of blood when oxygen-rich and carbon dioxide-rich blood reaches the heart?

Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.

Look at Figure 11.1. Draw another figure of the same set-up as would be observed after a few hours.

Arrange the following statements in the correct order in which they occur during the formation and removal of urine in human beings.

(a) Ureters carry urine to the urinary bladder.

(b) Wastes dissolved in water are filtered out as urine in the kidneys.

(c) Urine stored in the urinary bladder is passed out through the urinary opening at the end of the urethra.

(d) Blood containing useful and harmful substances reaches the kidneys for filtration.

(e) Useful substances are absorbed back into the blood.

Paheli uprooted a rose plant from the soil. Most of the root tips, with root hairs, got left behind in the soil. She planted it in a pot with new soil and watered it regularly. Will the plant grow or die? Give a reason for your answer.

Name the only artery that carries carbon dioxide-rich blood.

Why is it called an artery if it does not carry oxygen-rich blood?

Boojho’s uncle was hospitalised and put on dialysis after a severe infection in both of his kidneys.

What is dialysis?

Boojho’s uncle was hospitalised and put on dialysis after a severe infection in both of his kidneys.

When does it become necessary to take such a treatment?

Name the process and the organ which helps in removing the following wastes from the body.

1. Carbon dioxide
2. Undigested food
3. Urine
4. Sweat

Observe Figure 11.2 and answer the given questions:

(a) Name the instrument.

(b) Label parts A, B and C.

Paheli noticed water being pulled up by a motor pump to an overhead tank of a five-storeyed building. She wondered how water moves up to great heights in the tall trees standing next to the building. Can you tell me why?

Match the parts of the heart in Column I with the direction of the flow of blood in Column II.

Read the following terms given below.

root hairs  xylem  urethra  arteries  kidneys  veins  atria capillaries  heart  ureter  phloem  urinary bladder

Group the terms on the basis of the categories given below.

(a) The circulatory system of animals.

(b) Excretory system in humans.

(c) Transport of substances in plants.

Fill in the blanks of the following paragraph using just two words – arteries and veins.

___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)_____.

While learning to ride a bicycle Boojho lost his balance and fell. He got bruises on his knees and they started bleeding. However, the bleeding stopped after some time.

(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?