Class 10 NCERT Solutions for Science Chapter 6

VSAT 2022

NCERT Solutions for Class 10 Science Chapter 6 - Life Processes

Class 10th is one of the most critical years of a student's life; this class can help you understand all the basic concepts you will use in the coming years of your education. When it comes to science, a student needs to be extra careful as this class brings so many new concepts that need to be understood with total attention. As a student, life processes chapter 10 is one of the subjects that doesn't ask you to make assumptions to solve an answer. Besides, it gives you a formula and its derivation that shows how the formula finally came into existence and why you need to use it in the first place.

The Class 10 Science chapter 6 tells students about metabolism, which is a chemical process that occurs in a human body responsible for controlling the human state of the cells in an organism. The metabolism has two classes catabolism and anabolism. Vedantu is a platform that provides free NCERT Solutions and other study materials for students. Maths Students who are looking for better solutions ,They can download Class 10 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

Topics and Subtopics under Class 10 Science Chapter 6 Activities Solutions

The following is a list of topics and subtopics that have been covered in the NCERT Solutions for Class 10 CBSE Science Chapter 6: 

  • Life Processes

  • What Are Life Processes?

  • Nutrition

  • Respiration

  • Transportation

  • Excretion

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1. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?

Ans: Diffusion is insufficient to meet the oxygen requirements of multicellular organisms like humans because the process of diffusion is very slow and will take a lot of time to reach each and every cell of the body since our body is very huge and complex and each and every cell of the body requires oxygen.

2. What criteria do we use to decide whether something is alive?

Ans: The main criteria that we use to decide whether something is alive or dead are the events of Life processes. These fundamental life processes include nutrition, respiration, transportation, excretion, control and coordination, growth, and reproduction. If these processes occur normally then the organism is considered living because in the case of non-living organisms these processes do not take place

3. What are outside raw materials used by an organism?

Ans: Food, water, and oxygen are the outside raw materials that are used by an organism. These raw materials vary in amounts, source, and type depending upon various organisms and are used mainly for some important functions in the body of the organisms. They also provide energy to the body to perform various functions.

4. What processes would you consider essential for maintaining life?

Ans: The processes that are essential for maintaining life are nutrition, respiration, transportation, excretion, and control, and coordination. These are the processes that make the organism living. 

5. What are the differences between autotrophic nutrition and heterotrophic nutrition?

Ans: The differences between autotrophic nutrition and heterotrophic nutrition are:

            Autotrophic Nutrition

          Heterotrophic Nutrition

The organisms make their own food with the help of various raw materials that include carbon dioxide and water and the process occurs in the presence of sunlight and chlorophyll.

The organisms do not make their own food, instead obtain their nutrition from other living organisms like plants (autotrophs).

Autotrophs require energy that is obtained from light to synthesize their food.

Heterotrophs obtain energy from food that they consume by digesting them and other organic substances as well.

Eg: All green plants, algae, some bacteria, seaweeds, etc.

Eg: All animals, Humans, fungi such as mushrooms, yeast, etc.

6. Where do plants get each of the raw materials required for photosynthesis?

Ans: These raw materials required by plants for photosynthesis are as follows: sunlight, water, carbon dioxide, and chlorophyll.

  • Carbon dioxide in plants can be obtained from the atmosphere and is absorbed through the stomata.

  • Water is absorbed by the roots of plants from the soil as soil mainly holds the water. 

  • Sunlight is obtained from nature.

  • Chlorophyll acts as the main component and is found in the plant organelle called a chloroplast. (Chlorophyll is found in all of the green parts of the plants).

7. What is the role of the acid in our stomach?

Ans: The role of the acid in our stomach is to mainly dissolve the large chunks of food and create an acidic medium to activate various digestive enzymes. In the acidic medium, the enzyme pepsinogen is activated and then converted to pepsin, which is a protein-digesting enzyme and helps in the digestion of proteins and can also kill the bacteria present in the stomach that enters along with food. The enzyme pepsin requires HCl to get activated in the presence of HCl. The acid will break down the food more easily and helps in absorbing nutrients and easy digestion of food.

8. What is the function of digestive enzymes?

Ans: The digestive enzymes perform certain important functions that include the breaking down of complex food molecules into simpler food molecules that can be easily absorbed by the cells of the body. These enzymes also function as a biocatalyst that increases the rate of reaction and thus accelerates the rate of breaking down of complex food. There are various digestive enzymes present in the body, such as pepsin, trypsin, amylase, lipase, etc. 

9. Write the role of villi in the human digestive system.

Ans: Villi are the finger-like projections that are present throughout the lining of the internal surface of the small intestine. They are primarily responsible for increasing the surface area of the small intestine which in turn increases surface area for absorption of the digested food. Villi are majorly supplied with blood vessels that help to absorb digested food into the bloodstream.

10. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?

Ans: The advantage terrestrial organisms have over aquatic organisms is the amount of oxygen present in the surroundings. Terrestrial organisms have air in the atmosphere that surrounds them making it easy for them to breathe while in the case of aquatic organisms they breathe the air which is dissolved in the water. Thus the amount of oxygen present in the air is much more than the amount of oxygen present in the water.

11. What are the different ways in which glucose is oxidized to provide energy in various organisms?

Ans: The different ways in which glucose is oxidized to provide energy in various organisms are:

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12. In mammals and birds, why is it necessary to separate oxygenated and deoxygenated blood?

Ans: In Mammals and birds it is important to separate the oxygenated and deoxygenated blood because they are homoeothermic and warm-blooded animals. Due to this character, they can maintain their temperature constant throughout and the changes in their environment do not affect their body temperature regulation. This process also results in a good supply of oxygen in the case of birds and mammals so that optimum oxidation of glucose can take place. So to supply the required amount of oxygen it is important to have separate oxygenated and deoxygenated blood.

13. List three characteristics of the lungs that make them an efficient respiratory surface.

Ans: The characteristics that make lungs an efficient respiratory surface are:

1. Thin: The walls of the alveoli or air sac are very thin resulting in the quick diffusion of gases. They help in the absorption of oxygen inside the blood by inhalation process and also remove the carbon dioxide from the lungs by exhaling it to the outside.

2. Moist: The air sacs are composed of mucus that makes them moist which helps the gases to dissolve easily before diffusing.

3. Large surface area: In the lungs of human beings, its surface area is almost similar to the surface area of the tennis court that helps in the diffusion of gases. The alveoli or air sacs results in increasing the surface area of the lungs for the absorption of oxygen.

4. Good blood supply: The air sacs or alveoli are composed of a large capillary network that helps in the exchange of large volumes of gases. Thus greater the flow of blood in the lungs the greater would be the exchange of gases.

14. What are the components of the transport system in human beings? What are the functions of these components?

Ans: The main components of the transport system in human beings are the heart, blood, and blood vessels and their function are as follows:

  • The heart helps in pumping the oxygenated blood throughout the body. From the various parts of the body the deoxygenated blood is accumulated in the heart and from there it goes to the lungs for oxygenation.

  • Blood is the main body fluid that helps in the transport of nutrients, oxygen, carbon dioxide, nitrogenous wastes, and hormones. Blood also consists of white blood cells (WBCs) thus making it the main component of our immune system. Blood also consists of platelets that cause the clotting of blood that helps in repairing the damaged blood vessels. Also, the temperature of the body is also maintained by transportation. 

  • Blood vessels (arteries, veins, and capillaries) are responsible for blood transportation either from the heart to various other body organs or from various body organs to the heart. All arteries carry oxygenated except pulmonary arteries and they transport blood from the heart to various parts of the body while all veins carry deoxygenated blood except pulmonary veins. The material that exchanges between the blood and tissues takes place inside the capillaries.

15. What are the components of the transport system in highly organized plants?

Ans: In highly organized plants, the transport system consists of vascular tissues. These are also called conducting tissues that two are of different types which include − xylem and phloem. The water and mineral which is obtained from the soil through roots are conducted through the xylem tissues to various parts of the plant while the food materials are conducted through the phloem tissues from the leaves to different parts of the plant body.

16. How are water and minerals transported in plants?

Ans: The transportation of water and minerals in the plants occurs through the xylem tissues which is a part of the vascular system and occurs mainly in the upward direction that is from roots to the leaves while the other part of the vascular system includes phloem vessels which help in the transportation of the photosynthetic products within the plants, from leaves to all parts like the stem, roots, fruits, etc. and the transportation takes place in all directions.

17. How is food transported in plants?

Ans: The food is produced in the leaves of the plants through the process of photosynthesis and from leaves it is then transported to various parts of the body through phloem tissues. The phloem requires energy in the form of ATP for the transportation of food materials. This results in the development of osmotic pressure inside the tissue that increases the movement of water into the tissues. The osmotic pressure results in the movement of the material in the phloem to those tissues which have less pressure. This helps the tissue in moving the food materials according to the needs of the plant. Sucrose is a food material that requires energy in the form of ATP when it is transported into the phloem tissue.

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18. Describe the structure and function of the nephron in the human body.

Ans: The structural and the functional units of the kidney are Nephrons (filtration units). Each kidney consists of a large number of nephrons. Nephrons are composed mainly of two parts - renal corpuscle and renal tubule.

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The renal corpuscle is composed of a cup-shaped structure called Bowman’s capsule which is surrounded by a cluster of capillaries that helps in the collection of filtered urine. The composition of urine changes as it passes through the tubular part of the nephron due to the reabsorption of amino acids, glucose, salts, and water. The reabsorption of the amount of water and other substances depends on their presence in the body. The urine then enters the collecting duct of the kidney from where it is then transported to the long tube called the ureter. Lastly, the urine is then collected in the urinary bladder.

19. What are the methods used by plants to get rid of excretory products?

Ans: The excretory products of the plants may either be excreted out or may be stored as per the need of the plant. The excess amount of water in the plants can be removed by transpiration while the waste materials may be stored in the cell vacuoles or especially in old xylem vessels such as gum and resin. If it is also stored in the leaves then they fall off later. By the process of diffusion through stomata, the waste products that are obtained at the end of photosynthesis (oxygen) and respiration (carbon dioxide) are released.

20. How is the amount of urine produced regulated?

Ans: The amount of urine that is regulated depends upon the amount of water and other substances that are present. The urine is composed mainly of water so water is the main component in its regulation. If the amount of water is more in the body then the water reabsorbed will be less and more water will be released from the body and vice versa.  There are various other factors that are responsible for the regulation of urine hormone such as Antidiuretic hormone (ADH) and also the habitat of an organism that regulates the amount of urine produced.

21. The kidneys in human beings are a part of the system for

(a) Nutrition.

(b) Respiration.

(c) Excretion.

(d) Transportation.

Ans: (c) The kidneys in human beings are a part of the system for excretion. They are the organs that help in the excretion and removal of waste materials from the body through the regulation of urine.

22. The xylem in plants is responsible for

(a) The transport of water.

(b) Transport of food.

(c) Transport of amino acids.

(d) Transport of oxygen.

Ans: (a) The xylem in plants is responsible for the transport of water. The xylem tissues are the vascular or conducting tissues that help in the transport of water and minerals from the roots to various parts of the plant. These minerals and water are absorbed from the soil through the roots.

23. The autotrophic mode of nutrition requires

(a) Carbon dioxide and water.

(b) Chlorophyll.

(c) Sunlight.

(d) All of the above.

Ans: (d) The autotrophic mode of nutrition requires carbon dioxide, water, chlorophyll, and sunlight. Autotrophic nutrition is the process of making food by the organism itself. The food here is prepared by the process of photosynthesis which requires all the raw materials that are mentioned above.

24. The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in

(a) Cytoplasm.

(b) Mitochondria.

(c) Chloroplast.

(d) Nucleus.

Ans: (b) The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in mitochondria. This process is known as aerobic respiration where oxygen is required. 

25. How are fats digested in our bodies? Where does this process take place?

Ans: Fats are present in the small intestine of our body in the form of large globules. The various juices from the liver (bile juice) and liver (pancreatic juice) are secreted in the small intestine. The bile salts that are released from the bile juice of the liver will help in breaking down the large fat globules into smaller globules so that the pancreatic enzymes (lipases) can easily act on them. The process of breaking down large fat globules into smaller fat droplets is termed emulsification.

26. What is the role of saliva in the digestion of food?

Ans: Saliva is a watery fluid that is secreted by the salivary glands present in the mouth. The functions of saliva start from the moistening of food that results in the formation of a food bolus, this food bolus can be easily swallowed and thus saliva helps in the process of digestion of food starting from the mouth. Saliva breaks down starch into maltose and dextrin with the help of an enzyme amylase present in it.

27. What are the necessary conditions for autotrophic nutrition and what are its by-products?

Ans: Autotrophic nutrition is the process where the organisms make their own food by themselves; this takes place through the process of photosynthesis. The necessary conditions that are required for autotrophic nutrition are the presence of sunlight along with raw materials that include carbon dioxide, water, and chlorophyll. The by-products of autotrophic nutrition are the carbohydrates in the form of glucose (food) and oxygen which are inhaled by animals.

$6{ CO }_{ 2 }+6{ H }_{ 2 }O\xrightarrow { Sunlight\quad Energy } { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }+6{ O }_{ 2 }$

28. What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.

Ans: The differences between aerobic and anaerobic respiration are:

Aerobic Respiration

Anaerobic Respiration

1) Aerobic respiration occurs in the presence of oxygen. 

1) Anaerobic respiration occurs in the absence of oxygen.

2) In this process, glucose breakdown completely results in oxidation.

2) In this process, the glucose molecule breaks down incompletely.

3) carbon dioxide, water, and energy are released in the form of end products.

3) The ethyl alcohol or lactic acid, carbon dioxide, and energy are formed as the end products.

4) It takes place in both the plant and animal cells.

4) It takes place in many anaerobic bacteria, yeast, and human muscle cells.

29. How are the alveoli designed to maximize the exchange of gases?

Ans: Alveoli are the air sacs that are in the form of tiny pouches or sac-like structures present inside the lungs. They are in the form of balloon-like structures which increase the surface area for inhalation of air composed of blood capillaries. The alveoli present in the lungs are more than millions that increase the surface area of the lungs for the exchange of gases. Thus, a large amount of air is brought in contact with the air in the lungs; this maximizes the exchange of gases in the lungs.

30. What would be the consequences of a deficiency of hemoglobin in our bodies?

Ans: Haemoglobin is found in the red blood cell of the blood as the respiratory pigment that helps in the transportation of oxygen to the body cells for cellular respiration. Therefore, if the hemoglobin is deficient in the blood then it will affect the oxygen supplying capacity of blood resulting in the deficiency of oxygen in the body cells. This can also lead to anemia, an iron deficiency condition where the amount of blood in the body is quite less than required.

31. Describe double circulation in human beings. Why is it necessary?

Ans: Double circulation is a process of blood circulation in which blood flows twice through the heart.

It constitutes of two steps:

1. Pulmonary circulation.

2. Systemic circulation.

Pulmonary circulation starts from the right ventricle and ends in the left atrium after the process of oxygenation occurs from the lungs.

While the systemic circulation starts from the left ventricle and ends in the right atrium after the materials get exchanged throughout the body.

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Importance Of Double Circulation:

The oxygen is supplied more efficiently to the body cells when there is a separation of oxygenated and deoxygenated blood. The efficient oxygen supply in human beings is very useful for the maintenance of high blood pressure for various processes and also provides pure blood to reach various parts of the body.

32. What are the differences between the transport of materials in the xylem and phloem?

Ans: The differences between the transport of materials in the xylem and phloem are:

Transport Of Materials In Xylem

Transport Of Materials In Phloem

(i) They help in the transportation of water.

(i) They help in the transportation of water and minerals.

(ii) Xylem elements consist of vessels and tracheids.

(ii) Phloem elements consist of sieve tubes and companion cells.

(iii) Transportation starts from the roots to various parts of the plant.

(iii) Transportation starts from the leaves and then moves towards the roots.

(iv) Helps in providing water and minerals to all parts of the plant.

(iv) Helps in providing nutrients to all parts of the plant.

33. Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.

Ans: The comparison of alveoli in the lungs and nephrons in the kidneys are:




(i) Alveoli are air-sacs that are present in the lungs in the form of balloon-like structures.

(ii) The cell walls of alveoli are thin, only one cell thick and composed of an extensive network of blood capillaries.


(i) Nephrons are present inside the kidneys in the form of tubular structures.

(ii) Nephrons consist of three main parts - glomerulus, bowman’s capsule, and a long renal tube. They are composed of a cluster of thin-walled capillaries.

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(i) The gaseous exchange of oxygen and carbon dioxide occurs in between the blood of the capillaries that are present around the alveoli and the gases that are present in the alveoli. 

In alveoli, there is no selective reabsorption.


(i) Nephron helps in the process of filtration of the blood and removal of wastes. The solutes and excess water is filtered out when the filtration starts in the nephron. The selective reabsorption of essential molecules like amino acids, sodium salts, glucose, and water occurs before the formation of the final filtrate (urine).

(ii) The exchange of gases for the process of respiration takes place in alveoli.

(ii) The basic filtration unit for excretion is nephrons.

NCERT Solutions for Class 10 Science Chapter 6 - Life Processes

Science NCERT Grade 10, Chapter 6, Life Processes offers the approaches important to preserving life in living organisms. The term life processes are described in the chapter. Also, the significance of numerous organs involved in carrying out significant life processes is likewise taken into consideration. The manner of nutrition is covered in detail alongside its related concepts. The following  modes of nutrition in living organisms are mentioned:

  1. Autotrophic nutrition

  2. Heterotrophic nutrition

  • The diagrammatic illustration of the cross-segment of the leaf and the open and closed stomatal pore is blanketed beneath the autotrophic mode of nutrition. It additionally talks approximately the critical elements important to result in the procedure of photosynthesis. The process of nutrition in amoeba and human beings is ascribed alongside their schematic view. Additional information on dental caries is also furnished in the chapter. 

  • The manner of respiration is likewise defined in detail in the chapter, Life Processes. The breakdown of glucose by numerous pathways in the human body is mentioned. 

  • A schematic view of the human respiratory system is covered in the chapter. Subsequently, the manner of transpiration is dealt with in-depth. A schematic sectional view of the human heart along with the transportation and interchange of oxygen and carbon dioxide in the human body is presented in the chapter. 

  • Similarly, the manner of transportation of water, meals, and different substances in plants is also defined. The whole mechanism of excretion in humans is mentioned with the assistance of an appropriate diagram. Supplementary information on artificial kidney and organ donation is likewise provided in the chapter, Life Processes.

The subjects discussed in the chapter, Life Processes are - What are Life Processes, Nutrition, Respiration, Transportation, and Excretion.

Students who are looking for NCERT Solutions for Class 10 Science Chapter 6 - Life Processes PDF can opt for Upcoming Exams and also You can Find the Solutions of All the Science Chapters below.

NCERT Solutions for Class 10 Science

Life Processes Class 10 Ncert Solutions PDF

The life process class 10th shows us how life happened on earth and the world that we see today, how it came to exist, and what made the planet's environment habitable. The life process chapter tells the student that maintaining a living organism is essential even if the body is in the resting condition or even if it's sleeping.

With our life processes class 10 solutions, students will know about the different types and forms of nutrition and why our body needs it. There are two modes of getting nutrition into the body. These are autotrophic and heterotrophic.

The life processes class 10 pdf that we have created for the students will help them revise and clear their doubts if they have regarding the concepts and the definitions present in this chapter. Our pdf is curated by teachers who are in the teaching line for more than five years, and they have an excellent knowledge of this subject in particular. As a result, you will get to know all the little details you might miss when reading and learning the chapter all by yourself.

Life Processes Class 10 Ncert Solutions

This chapter from the science textbook from class 10th introduces students to various from of life process. The life that we see around on this planet earth is mainly based on certain kinds of functions, and the process and all these are covered in this chapter. These processes are required for the body to stay healthy and perform their daily task without having any issues. These necessary essential activities performed by organisms are termed as life processes.

There are several life processes such as nutrition, transportation, metabolism, reproduction that help in living organisms' functioning. It is essential to know about these processes cause they are necessary for a body to be working correctly. The students who want to pursue a medical science career need to pay extra attention to this chapter. This chapter brings many concepts into a light that a medical student will be studying in the coming years of their college.

In this chapter, you will learn about the difference between plants and animals' life process, which will help students understand their working and how plants are green in color, and how they get to prepare their food all by themselves. On the other hand, you will get know-how plants can perform photosynthesis from the very basic to advanced. Also, this chapter will show you how a stomata works and exchange gases.

Everything that you need to know about plants and organisms will be taught to you in this chapter, so you need to listen carefully when teaching you.

FAQs on Class 10 NCERT Solutions for Science Chapter 6

1. What are Enzymes? Give one Example of the Enzyme Present in the Human Body and Write its Function in the Human Body?

Enzymes are biological molecules that significantly speed up the rate of chemical reactions in a cell within a human body. They are an essential part of life, and they serve a wide range of functions in the body. From digestion to maintaining one's body's metabolism, enzymes are working everywhere to make things easier for the human body.

Enzymes help in breaking large molecules into smaller pieces so it can be easily absorbed by the body. Other than that, enzymes help in binding two molecules together to produce new molecules. Each enzyme has its own work to do, so they are selective catalysts meaning they only speed up a specific reaction in the human body. Respiration, excretion, etc. are different forms of life processes and work of enzymes in a body.

2. Why do Herbivores Have Much Longer, Smaller Intestine in Comparison to Carnivores?

Herbivores are animals that consume plants and no meat for their food intake. The plants and the byproducts that the herbivores animals eat contain cellulose in their cell wall. As a result, when it comes to digestion of cellulose in the gut takes a longer time; hence animals need larger, small intestine.

3. What concepts are used in Chapter 6 of Class 10 Science?

Chapter 6 “Life Processes” of Class 10 Science consists of the topics which are listed below:

  • Introduction

  • What are Life Processes?


  • Autotrophic Nutrition

  • Heterotrophic Nutrition

  • How do Organisms obtain their Nutrition?

  • Nutrition in Human Beings

  • Respiration


  • Transportation in Human Beings

  • Transportation in Plants


  • Excretion in Human Beings

  • Excretion in Plants

4. In the human digestive system, what are the functions of the pancreas and liver, according to Chapter 6 of Class 10 Science?

The liver does the secretion of the bile juice. This bile salt helps break down the large globules of fat so that enzymes can act on them. The organ pancreas secretes the pancreatic juice, which contains enzymes like trypsin used to digest proteins. The enzyme lipase is used for breaking emulsified fats. The intestinal juice secreted by the glands of the small intestine converts proteins to amino acids, carbohydrates into glucose, and fats into glycerol and fatty acids. Refer to NCERT Solutions for Chapter 6 of Class 10 Science free of cost on the Vedantu website or the Vedantu app, to get in-depth knowledge of the Chapter.

5. How is oxygen used by different types of animals, according to Chapter 6 of Class 10 Science?

The organisms living on the land use oxygen directly from the atmosphere. The different organs absorb this oxygen. These organs have a structure that increases surface area to absorb this oxygen. Marine animals have to use dissolved oxygen. The amount of oxygen in water is fairly low as compared to the atmosphere. Because of this, the breathing rate of aquatic animals increases. The fishes take oxygen from the mouth, and then the oxygen passes through the gills, which are taken up by the blood.

6. How does the excretory system work in the human body, according to Chapter 6 of Class 10 Science?

The excretory system of the human body consists of the following organs, a pair of kidneys, a pair of ureters, a urinary bladder, and a urethra. The kidneys produce urine which passes into the urinary bladder through the ureters. Kidneys are also known as basic filtration units. Each kidney has filtration units called nephrons which are present in large numbers. This urine is stored in the urinary bladder, which is passed out through the urethra.

7. What are the major differences between arteries and veins, according to Chapter 6 of Class 10 Science?


  • These vessels carry oxygenated blood except for pulmonary arteries.

  • The walls of the arteries are elastic and thick.

  • The arteries are located deep inside the body.

  • The colour of the arteries is red.

  • These help in transporting blood away from the heart to different organs.


  • The veins carry deoxygenated blood except for the pulmonary veins.

  • These have thin walls.

  • The location of the veins is closer to the skin.

  • The colour of the veins is blue.

  • The transportation of blood to the heart from various parts of the body is done by veins.

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