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NCERT Solutions for Class 7th Science

 

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Chapter 11. Transportation in Animals and Plants

Additional Questions With Solutions

 

 

 

11. Transportation in Animals and Plants


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

Ans. – All organisms need food, water and oxygen for survival. The plants absorb food and water through roots. They make food in leaves. Thus the animals also utilised  food in their various organs. They obtain these foods from intestine. These need a system which transports these foods to tissues. There also need the transportation of waste from body.

Que. – What is called the fluid part of blood?

Ans. – Plasma.

Que. – What is blood? Write its function.

Ans. –Blood is the fluid which flows in the blood vessels.

It transports substances like digested food from small intestine to other parts of body.
It carries oxygen from lungs.
It also transports wastes for removal from body.

Que. – What is the normal pulse rate in a resting person?

Ans. – 72 to 80 beats per minute.

Que. – Name the various kinds of blood cells. Write their functions.

Ans. – There are three types of blood cells.

Red blood cells (RBC) – It contains haemoglobin which gives a red pigment to blood. It carry O2 and CO2. 
White blood cells (WBC) – It fights against germs that may enter our body. So these are called the soldiers of body.
Platelets – it forms clot of blood for stopping bleeding.

Que. – What are transported by these?

      (i)  Veins   (ii) Arteris

Ans. – (i) Veins – Veins carry the blood rich in carbon dioxide.

       (ii)  Arteries – these carry the blood rich in oxygen.                  

Que. – Write the type of blood vessels.

Ans. – There are three types of blood vessels.

       (i) Artery

       (ii)  Vein

       (iii)  Capillary

Que. – What are called the blood vessels where arteries joins veins?

Ans. – Capillary.

Que. – What is pulse rate?

Ans. –The number of beats per minute is called the pulse rate.

Que. – How many chambers does the heart have?

Ans. – The heart has four chambers these are right Atrium, right ventricle, left atrium and left ventricle.

Que. – What are the roles of partition between the chambers?

Ans. – The partition between chambers helps to avoid mixing up of blood rich in oxygen with the blood rich in carbon dioxide.

Que. – Name the instrument by which the doctor hears the heartbeats.

Ans. –  Stethoscope.

Que. – What is excretion?

Ans. –  The process of removal of wastes produced in the cells of the living organisms is called excretion.

Que. – Name the excretory organs?

Ans. –   Kidneys, Ureters and urinary bladder.

Que. – Name the vascular tissues those transport the substances in plants.

Ans. – (i) Xylem  (ii)  Phloem


Que. – What are transported by the followings?

         (i) Xylem (ii) Phloem

Ans. – Xylem – it transports water and nutrients from roots to leaves and other part of plants.

        Phloem – it transports the food synthesised by leaves to all the parts of plants.

Que. – What are stomata? Give two functions of stomata.

Ans. –  There are many small holes are present on the surface of the leaves, these are called stomata.

Functions of stomata.

(i) The process of transpiration takes place through stomata.
(ii) All gaseous exchanges take place through stomata.

(iii) Absorption of photo energy also takes place through stomata.

Que. – Describe the function of heart.

Ans. –     It pumps blood for life.

It collects and from all parts of body.
It distributes blood to all parts of body.

Que. – Why is it necessary to excrete waste products?

Ans. –    Waste products have toxin substances which is very harmful for our body so these are necessary to excrete out. 

Que. – Why is blood needed by all parts of a body?

Ans. –   Blood is a medium of transportations of various nutrients, food oxygen those body need. And it also carries out the waste products.

Que. – What are the components of blood?

Ans. –  Plasma, red blood cells, white blood cells, and platelets are the main components of blood.

Que. – Draw a diagram of the human excretory system and label the various parts.

Que. – Name the instrument by which the doctor hears heart sound.

Ans. –   stethoscope.

Que. – What is tissue?

Ans. – A tissue is a group of cells that perform specialized function in an organism.

Que. – Write the role of root hair presence in the root of plants.

Ans. –  The roots have root hair, which increase the surface area of the root for the obsorption of water and mineral nutrients dissolved in water. 

Que. – Name the system which removes the wastes from the body.

Ans. –   Excretory system.

Que. – Write the function of haemoglobin?

Ans. –   

Haemoglobin bind with oxygen and transports it to all the parts of the body and ultimately to all the cells. The presence of haemoglobin makes blood appear red.    

 

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