NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants

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Updated at 2021-02-11


NCERT solutions for class 7 Science Chapter 11 Transportation In Animals And Plants Exercise

Q.1 Match structures given in Column I with functions given in Column II.
Column- I
(i) Stomata
(ii) Xylem
(iii) Root hairs
(iv) Phloem
Column-II
(a) Absorption of water
(b) Transpiration
(c) Transport of food
(d) Transport of water
(e) Synthesis of carbohydrates



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

Column- I. Column-II
(i) Stomata ?(b) Transpiration
(ii) Xylem?(d) Transport of water
(iii) Root hairs?(a) Absorption of water
(iv) Phloem?(c) Transport of food

Q.2 Fill in the blanks : (i) The blood from the heart is transported to all parts of the body by the _____________
(ii) Haemoglobin is present in ___________ cells.
(iii) Arteries and veins are joined by a network of ___________.
(iv) The rhythmic expansion and contraction of the heart is called ___________
(v) The main excretory product in human beings is ___________
(vi) Sweat contains water and.
(vii) Kidneys eliminate the waste materials in the liquid form called_______________.
(viii) Water reaches great heights in the trees because of suction pull caused by_____________.



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

(i) The blood from the heart is transported to all parts of the body by the arteries .
(ii) Haemoglobin is present in red blood cells.
(iii) Arteries and veins are joined by a network of capillaries.
(iv) The rhythmic expansion and contraction of the heart is called heartbeat.
(v) The main excretory product in human beings is urea .
(vi) Sweat contains water and salts .
(vii) Kidneys eliminate the waste materials in the liquid form called urine .
(viii) Water reaches great heights in the trees because of suction pull caused by transpiration .

Q.3 Choose the correct option:
(a) In plants, water is transported through
(i) xylem
(ii) phloem
(iii) stomata
(iv) root hair
(b) Water absorption through roots can be increased by keeping the plants
(i) in the shade
(ii) in dim light
(iii) under the fan
(iv) covered with a polythene bag



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

a) i) Xylem
b) iii) under the fan

Q.4 Why is transport of materials necessary in a plant or in an animal? Explain.



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

Transport of materials is necessary in both plants and animals as every cell needs a regular supply of nutrients and oxygen for releasing energy through respiration. Our body also requires a constant removal of waste materials such as carbon dioxide. For the transport of all these materials (food, oxygen, and wastes), our body has a specialised transport system. Similarly, in plants, the transport of water and food is accomplished with the help of a complex transport system.

Q.5 What will happen if there are no platelets in the blood?



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

If there are no platelets in the blood, then the blood would not be a clot.

Q.6 What are stomata? Give two functions of stomata.



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

Stomata are tiny pores present on the surface of a leaf. Functions of stomata:
(a) Stomata help in respiration.
(b) Evaporation of water.

Q.7 Does transpiration serve any useful function in the plants? Explain.



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

Transpiration is the evaporation of water from the plants. The water evaporates through the stomata present on the surface of the leaves. However, it is important for plants as it helps in the movement of water to the top of tall trees. As a result, it helps in the distribution of water throughout the plant body. It also helps in maintain the temperature in the plant.

Q.8 What are the components of blood?



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

The main components of blood are
(i) Red blood cells (RBCs): Red blood cells are the most abundant cells in the blood. These cells contain a red pigment called haemoglobin. It helps to carries oxygen and transports it to all parts of the body.
(ii) White blood cells (WBCs): WBCs are colourless cells without haemoglobin. They fight against infections and protect the body from foreign particles such as germs and bacteria.
(iii) Platelets: Platelets are the smallest cells in the blood. It helps to make a clot of blood.

Q9 : Why is blood needed by all the parts of a body?



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

Blood is needed by all the parts because it helps to transportation the digested food and oxygen in body . It supplies the oxygen and digested food to various parts of the body to provide essential energy to them which helps the body to perform various functions. They fight against infections and protect the body from foreign particles such as germ a and bacteria.

Q.10 What makes the blood look red?



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

Haemoglobin

Q.11 Describe the function of heart .



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

The human heart is divided into four chambers. The upper two chambers are called right and left atrium and the lower two chambers are called the right and left ventricles. Right atrium receives carbon dioxide-rich blood from the body. Blood from right atrium enters the right ventricle, which contracts and pumps the blood to the lungs.

On the other hand, oxygen rich blood from the lungs returns to the left atrium. From the left atrium, blood enters left ventricle. Left ventricle contracts and pumps the blood to all parts of the body. Hence, the rhythmic contraction and expansion of various chambers of the heart maintains the transport of oxygen to all parts of the body.

Q.12 Why is it necessary to excrete waste products?



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :

Certain waste and toxic products are formed during functioning of body cells. The waste products like urea etc. are toxic. It is harmful for our body. When these toxic materials are not removed from the body, they get mixed with blood and can damage the cells of body. Therefore It is necessary to remove such poisonous waste materials from our body.

Q.13 Draw a diagram of the human excretory system and label the various parts.



NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants


Answer :



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