Chapter 9 | Structure and Function of the Living Organisms – Animals | Class- 6 DAV Science Solutions

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DAV Class- 6 Structure and Function of the Living Organisms – Animals Question and Answer

Something To Know

A. Fill in the blanks.

1. The process, of breaking down of food, into fine and soluble particles, is called digestion.

2. Blood vessels, that carry blood from organs to heart, are called veins.

3. The nervous system consists of billions of nerve cells.

4. The right portion of the brain controls the left part of the body.

5. Kidneys are bean shaped organs that help in filtering out waste products.

6. The skin removes water, and excessive salts, in the form of sweat.

7. The male reproductive organ system has a pair of testes.

B. Write True or False for the following statements.

1. Large intestine is responsible for the digestion and absorption of food.

Answer 1: True

2. Pharynx is also called as the ‘voice box.

Answer 2: False

3. Blood helps in maintaining our body temperature at a constant value.

Answer 3: True

4. The blood vessels, which take blood away from the heart, to various parts of the body, are called arteries.

Answer 4: True

5. Kidneys filter out waste products from the blood.

Answer 5: True

C. Tick the correct option.

1. Bile is secreted by the-

Answer 1: liver

2. The food, taken in the by the humans, stays for about 2 to 3 hours, in the-

Answer 2: stomach

3. The tube-like structure, attached to the brain is/are known as-

Answer 3: spinal cord

4. The organ, in the human body, which filters out waste products, such as urea, from the blood, is the-

Answer 4: kidneys

5. Ovaries are a part of the-

Answer 5: reproductive system

D. Answer the following questions in brief.

1. How many teeth are present in a four-month-old child’s mouth?

Answer 1: No teeth.

2. Where is saliva produced?

Answer 2: Saliva is produced in the mouth.

3. Define respiration.

Answer 3: Respiration is the process in which oxygen is taken in, and Carbon dioxide is released from the body.

4. Name the flap that shuts off the windpipe when you swallow food.

Answer 4: Epiglottis

5. How many types of vessels are found in the circulatory system of human beings?

Answer 5: There are three types of vessels are found in the circulatory system of human beings.

6. List down the main organs of the nervous system.

Answer 6: Brain, Spinal Cord, Nerves, Sense Organs.

7. Name the structure that protects the spinal cord.

Answer 7: Vertebrae 

8. Name the process of fusion of an egg with a sperm.

Answer 8: Fertilisation

E. Answer the following questions.

1. What is digestion? Starting from the mouth, state the various steps involved in digestion.

Answer 1: The process of breakdown of food into very fine and soluble particles is Called digestion.

Step 1: Mouth – In mouth saliva helps to moisten and soften the food so that it can be easily swallowed. 

Step 2: Food pipe – food pipe is a muscular organ that pushes the food down into the stomach. 

Step 3: Stomach – in our stomach the food gets mixed with the gastric juice secreted by the gastric glands of the stomach. Gastric juice helps in the digestion of food.

Step 4: Liver and Pancreas- liver secretes bile juice and the pancreas secrete pancreatic juice which contains certain enzymes that help in the digestion of food.

 Step 5: small intestine – The small intestine absorbs nutrients from the digested food and send them to all the parts of the body through the blood.

Step 6: Large intestine – The large intestine helps in the absorption of water from the undigested food which is then pushed out as waste.

2. Draw a diagram of the tongue and show the location of the taste buds on it.

Answer 2:

Chapter 9 | Structure and Function of the Living Organisms – Animals | Class- 6 DAV Science Solutions

3. Explain the role of diaphragm in the process of breathing.

Answer 3: Lungs cannot move by themselves; it is the movement of the diaphragm and the muscles between the ribs of the chest wall that causes the expansion and contraction of the lungs. Thus, breathing takes place.

4. Give the function of the heart, and the blood vessels, in the circulatory system.

Answer 4: The main function of the heart is to pump blood and keep it moving in the blood vessels. Functions of blood vessels:

1. Arteries – Arteries take blood away from the heart to various parts of the body.

2. Veins – Bring blood back to the heart from different parts of the body.

3. Capillaries – These are very fine vessels that connect arteries and veins to each other.

5. State the function of the nervous system. Briefly explain the role of nerves in it.

Answer 5: Nervous system controls and coordinates all the activities of our body.

Functions of nerves: nerves are of two types 

1. Sensory nerves – carry messages from sense organs to the brain.

2. Motor nerves – carry commands given by the brain to the muscles.

6. Give a brief outline of the process of excretion, by the kidneys, in human beings.

Answer 6: The kidneys are responsible for filtering waste items from the circulation. Urine is a light-yellow liquid made up of these wastes. The blood is cleaned in this way by the kidneys. Kidneys aid in the removal of harmful chemicals such as urea as well as excess water from the bloodstream.

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