The DAV Class 6 Science Book Solutions and DAV Class 6 Science Chapter 9 Question Answer – Structure and Function of the Living Organisms: Animals are essential study tools for DAV public school students in Class 6.
DAV Class 6 Science Ch 9 Question Answer – Structure and Function of the Living Organisms: Animals
DAV Class 6 Science Ch 9 Solutions – Structure and Function of the Living Organisms: Animals
Something To Know
A. Fill in the blanks.
Question 1.
The process of breaking down of food, into fine and soluble particles, is called ______
Answer:
Digestion
Question 2.
Blood vessels, that carry blood from organs to heart, are called ______
Answer:
Veins
Question 3.
The nervous system consists of billions of ______
Answer:
Neurons
Question 4.
The ______ portion of the brain controls the left part of the body.
Answer:
Right
Question 5.
Kidneys are ______ shaped organs that help in filtering out waste products.
Answer:
Bean
Question 6.
The skin removes water, and excessive salts, in the form of ______
Answer:
Sweat
Question 7.
The male reproductive organ has a pair of ______
Answer:
Testis
B. Write True or False for the following statements.
1. Large intestine is responsible for the digestion and absorption of food.
2. Pharynx is also called as the Voice box’.
3. Blood helps in maintaining our body temperature at a constant value.
4. The blood vessels, which take blood away from the heart, to various parts of the body, are called arteries.
5. Kidneys filter out waste products from the blood.
Answer:
1. Large intestine is responsible for the digestion and absorption of food. (False)
2. Pharynx is also called as the Voice box’. (False)
3. Blood helps in maintaining our body temperature at a constant value. (True)
4. The blood vessels, which take blood away from the heart, to various parts of the body, are called arteries. (True)
5. Kidneys filter out waste products from the blood. (True)
C. Tick (✓) the correct option.
1. Bile is secreted by the
(a) Salivary glands
(b) Pancreas
(c) Liver
(d) Kidneys
Answer:
(c) Liver
2. The food, taken in by the humans, stays for about 2 to 3 hours, in the
(a) Stomach
(b) Small intestine
(c) Food pipe
(d) Large intestine
Answer:
(a) Stomach
3. The tube-like structure, attached to the brain is/are known as
(a) Veins
(b) Nerves
(c) Food pipe
(c) Spinal cord
Answer:
(d) Spinal cord
4. The organ, in the human body, which filters out waste products, such as urea, from the blood, is the
(a) Kidneys
(b) Urinary bladder
(c) Lungs
(d) Heart
Answer:
(a) Kidney
5. Ovaries are a part of the
(a) Reproductive system
(b) Nervous system
(c) Digestive system
(d) Excretory system
Answer:
(a) Reproductive system
D. Answer the following questions in brief.
Question 1.
How many teeth are present in a four-month child’s mouth?
Answer:
Zero.
Question 2.
Where is saliva produced?
Answer:
Saliva is produced in mouth by salivary glands.
Question 3.
Define respiration.
Answer:
The process of utilizing food to release energy is called respiration.
Question 4.
Name the flap that shuts off the wind pipe when you swallow food.
Answer:
Epiglottis.
Question 5.
How many types of vessels are found in the circulatory system of human beings?
Answer:
There are two main types of blood vessels in the human circulatory system, viz. arteries and veins which branch out into blood capillaries.
Question 6.
List down the main organs of the nervous system.
Answer:
Brain, Spinal cord and Peripheral nerves.
Question 7.
Name the structure that protects the spinal cord.
Answer:
Vertebral column.
Question 8.
Name the process of fusion of an egg with a sperm.
Answer:
Fertilisation.
E. Answer the following questions.
Question 1.
What is digestion? Staring from the mouth, state the various steps involved in digestion.
Answer:
The process of breaking the food into simple and soluble particles is called digestion. Digestion in mouth: Food is chewed and changed into smaller particles. Saliva mixes with food to make it slippery. Some digestion happens in the mouth. Digestion in stomach: Gastric juices are secreted in the stomach and some part of digestion takes place.
Digestion in small intestine: Juices from pancreas and liver come to the small intestine. Major portion of digestion takes place in small intestine. After the completion of digestion, simple substances are absorbed in the small intestine.
Question 2.
Draw a diagram of the tongue to show the location of the taste buds on it.
Answer:
Question 3.
Explain the role of diaphragm in the process of breathing.
Answer:
Diaphragm facilitates expansion and contraction of lungs. When lungs expand, air enters the lungs and when the lungs contract, air goes out of the lung.
Question 4.
Give the function of various organs present in the circulatory system.
Answer:
The function of the heart and the blood vessels, in the circulatory system:
- Function of heart: Pumps blood to different parts of body.
- Function of artery: Carries blood from heart to different orga.
- Function of vein: Carries blood from different organs to the heart.
Question 5.
State the function of the nervous system. Briefly explain the role of nerves in it.
Answer:
The nervous system is responsible for controlling all the functions in the body. The nerves work like channels through which the nerve impulses are transmitted.
Question 6.
Give a brief outline of the process of excretion, by kidneys in human beings.
Answer:
Blood enters the kidney. Waste substances are filtered out from the blood, along with excess water. Waste and excess water convert into urine. Urine passes through ureters and gets collected in urinary bladder. Urine is expelled through urethra from time to time.
Value Based Questions
Sahardiya’s family was having their dinner on the Daughter’s day. Her mother told them that their organisation has decided to contribute to the education of the children in a neighbourhood village. She went on to say their organisation is trying to do something similar to what the blood, circulating in human body, does.
Question 1.
State the values displayed by the organisation in which Sahardiya’s mother works.
Answer:
Care for the girl child, care for children’s education.
Question 2.
State any two of the functions that the blood, circulating in the human body, does.
Answer:
Two functions of blood are as follows:
- Carrying food and oxygen to every part of the body.
- Maintaining the temperature of the body.
Question 3.
Have a discussion in the class in which the students give their opinion, about why they (a) agree (b) disagree, with the ‘comparison’ made by Sahardiya’s mother.
Answer:
Do it yourself.
Something To Do
Question 1.
Visit your local doctor. Request him to show you an instrument called stethoscope. It is used to hear the heart beat of a person by keeping it on the chest at an appropriate place. Learn how to use it correctly and try to listen to the heart beat of your family members.
Answer:
Do it yourself.
Question 2.
Now that you know how a stethoscope looks like, try to make one on your own. Take a long (approximately 50 cm) rubber tube and a funnel nearly 6-7 cm in diameter. Fit the rubber tube tightly at the end of the stem of the funnel. Place the open end of the tube in one of your ears and the open end of the funnel on the chest of a person. The sounds, you hear, are due to the ‘heart beats’ of that person. Use your self-made stethoscope to listen to the heart beat of your friends and family members.
Answer:
Do it yourself.
DAV Class 6 Science Chapter 8 Solutions – Structure and Function of the Living Organisms: Animals
I. Fill in the blanks.
Question 1.
An organ system is composed of many ______
Answer:
Organs
Question 2.
______ teeth appear when a child is about 6 months old.
Answer:
Milk
Question 3.
Salivary glands secrete ______
Answer:
Saliva
Question 4.
The ______ gives us the sense of taste.
Answer:
Tongue
Question 5.
Major portion of digestion takes place in ______
Answer:
Small intestine
Question 6.
______ is the largest gland in the human body.
Answer:
Liver
Question 7.
Air is filtered in the respiratory system when it passes through the ______
Answer:
Nasal chamber
Question 8.
______ is also called voice box.
Answer:
Larynx
Question 9.
The ______ pumps the blood.
Answer:
Heart
Question 10.
______ are responsible for clotting of blood.
Answer:
Platelets
Question 11.
The ______ controls all the functions in the human body.
Answer:
Brain
Question 12.
There are ______ ovaries in the female reproductive system.
Answer:
Two
II. Tick (✓) the correct option.
1. Digestion begins in which part of the digestive system?
(a) Mouth
(b) Oesophagus
(c) Small intestine
(d) Stomach
Answer:
(a) Mouth
2. Digestion does not happen in which of these parts?
(a) Mouth
(b) Oesophagus
(c) Stomach
(d) Small intestine
Answer:
(b) Oesophagus
3. Which of these is a balloon like organ?
(a) Pharynx
(b) Larynx
(c) Lungs
(d) Bronchi
Answer:
(c) Lungs
4. Exchange of gases takes place in which part of the respiratory s system?
(a) Pharynx
(b) Lungs
(c) Bronchi
(d) Alveoli
Answer:
(d) Alveoli
5. How many chambers are there in the human heart?
(a) One
(b) Two
(c) Three
(d) Foui’
Answer:
(d) Four
6. Which of these organs is responsible for excretion?
(a) Heart
(b) Lung
(c) Kidneys
(d) Testis
Answer:
(c) Kidneys
7. Which of these organs is a part of male reproductive system?
(a) Uterus
(b) Ovary
(c) Kidneys
(d) Testis
Answer:
(d) Testis
8. Which of these organs is a part of the female reproductive system?
(a) Uterus
(b) Kidneys
(c) Lungs
(d) Bronchi
Answer:
(a) Uterus
III. Answer the following questions.
Question 1.
Define tissue.
Answer:
A group of cells is called tissue.
Question 2.
Define an organ.
Answer:
A group of tissues is called an organ.
Question 3.
What are the various steps in the process of digestion?
Answer:
The process of digestion involves four main steps, viz. ingestion, digestion, absorption and assimilation.
Question 4.
What are the different types of teeth in human beings?
Answer:
There are four types of teeth, viz. incisors, canines, premolars and molars.
Question 5.
Write the functions of tongue.
Answer:
The main functions of the tongue are as follows:
- It helps us to taste the food. The tongue is sensitive to four basic tastes, i.e. salt, bitter, sour and sweet.
- It helps in swallowing the food.
- Help in mixing the food with saliva produced by salivary glands.
- It helps in speech.
Question 6.
Write a short note on stomach.
Answer:
It is a bag-like organ which is composed of muscular walls. The food is mixed with gastric juice in the stomach. Gastric juice helps in digestion of food.
Question 7.
Which are the main parts of human respiratory system?
Answer:
The main parts of the human respiratory system are; nasal chamber, pharynx, larynx, and lungs.
Question 8.
Write a short note on heart.
Answer:
Heart is a muscular oi’gan, which pumps the blood. There are four chambers in the human heart, viz. right auricle, right ventricle, left auricle and left ventricle. Deoxygenated blood comes to the right side of the heart and oxygenated blood comes to the left part of heart.
Question 9.
Write a short note on blood.
Answer:
Blood is a fluid tissue which is composed of blood plasma, blood cells and platelets. Red Blood Cells and White Blood Cells are the blood cells. Platelets help in blood clotting. Blood is responsible for carrying various substances in the body.
Question 10.
What is neuron?
Answer:
Neuron is the functional and structural unit of the nervous system. Neurons are specialized cells which are responsible for transmission of nerve impulses.
Question 11.
Write a short note on kidney.
Answer:
A kidney is a bean-shaped organ. Kidney filters the impurities and excess water from blood. Urine formation takes place in the kidneys.
IV. Projects
Question 1.
Make a labeled diagram of the human digestive system.
Answer:
Do it yourself.
Question 2.
Go to the science laboratory in your school and ask your teacher to show the model of human respiratory system. Make a diagram of the same.
Answer:
Do it yourself.
Question 3.
Count your heart rate, by counting the number of heart beats in a minute. Similarly, count the heart rate of some of your friends. Compare if the heart rate is same for everyone.
Answer:
Do it yourself.