The DAV Class 4 Science Book Solutions and DAV Class 4 Science Chapter 1 Question Answer – My Body are essential study tools for DAV public school students in Class 4.
DAV Class 4 Science Chapter 1 Question Answer – My Body
DAV Class 4 Science Ch 1 Question Answer – My Body
Something To Know
A. Fill in the blanks.
Question 1.
The body organs that cannot be seen from outside are called ______ organs.
Answer:
Internal
Question 2.
Flat teeth are in the ______ of the mouth.
Answer:
Front
Question 3.
Tongue is used for, ______ and ______
Answer:
tasting, speech
Question 4.
Saliva is secreted by ______
Answer:
Salivary gland
Question 5.
Flies can transfer ______ to uncovered food.
Answer:
Germs.
B. Match the following:
| Column A | Column B |
| 1. Milk teeth | (a) Absorption of water |
| 2. Large intestine | (b) Absorption of digested food |
| 3. Permanent teeth | (c) Undigested waste is collected |
| 4. Rectum | (d) Thirty two |
| 5. Small intestine | (e) Twenty |
Answer:
| Column A | Column B | |
| 1. Milk teeth | e | (a) Absorption of water |
| 2. Large intestine | a | (b) Absorption of digested food |
| 3. Permanent teeth | d | (c) Undigested waste is collected |
| 4. Rectum | c | (d) Thirty two |
| 5. Small intestine | b | (e) Twenty |
C. Tick (✓) the correct option.
1. The teeth, used to tear food into pieces, are known as
(a) incisors
(b) canines
(c) molars
(d) premolars
Answer:
(b) incisors
2. Ria’s mother is thirty two years old. She is likely to have
(a) 20 permanent teeth
(b) 20 temporary teeth
(c) 32 permanent teeth
(d) 32 temporary teeth
Answer:
(c) 32 permanent teeth
3. The organ, which secretes digestive juices in the small intestine, is the
(a) liver
(b) salivary glands
(c) stomach
(d) food pipe
Answer:
(a) liver
4. The food gets completely digested in the
(a) mouth
(b) stomach
(c) small intestine
(d) large intestine
Answer:
(c) small intestine
5. An eight year old child is likely to have
(a) only temporary teeth
(b) only permanent teeth
(c) both temporary and permanent teeth
(d) no teeth at all
Answer:
(c) both temporary and permanent teeth
D. Answer the following Questions in brief.
Question 1.
Name the organ through which food enters the stomach.
Answer:
Food enters the stomach through food pipe.
Question 2.
How many sets of teeth are formed during one’s lifetime?
Answer:
Two sets of teeth are formed during one’s lifetime.
Question 3.
Write any one difference between milk teeth and permanent teeth.
Answer:
Milk teeth starts appearing about when the baby is six months old whereas permanent teeth starts appearing between the age of six to twelve years.
Question 4.
What do you mean by the term ‘digestion’?
Answer:
Conversion of food into simple substances so that they can be absorbed and utilized by the body is called digestion.
Question 5.
What happens to the food when it enters the stomach?
Answer:
When food enters the stomach, digestive juices are mixed with food. Partial digestion of food takes place in stomach.
E. Answer the following Questions.
Question 1.
List five good habits that should be taken care of at the time of eating food.
Answer:
Five good habits at the time of eating food:
- Wash hands before eating.
- Raw fruits and vegetables should be properly washed.
- Chew the food properly.
- Drink plenty of water.
- Eat a balanced diet.
Question 2.
Name the different types of teeth present in the mouth. Also mention their functions.
Answer:
| Type of teeth | Function |
| Flat teeth (incisors) | Cutting and biting |
| Pointed teeth (canines) | Tearing |
| Broad and grooved teeth (premolars and molars) | Chewing and grinding |
Question 3.
Why is it important to chew the food properly?
Answer:
Chewing the food properly helps in breaking the food into small pieces. This makes it easier to swallow the food. This also helps in properly mixing the digestive juices in the food.
Question 4.
Why is washing of vegetables and fruits important for us?
Answer:
Unwashed vegetables and fruits may carry germs or their eggs. These germs cause many stomach ailments. So, it is important to wash fruits and vegetables before eating.
Question 5.
Sheena’s mother often tells her not to eat too many sweets and chocolates. Why do you think she says so?
Answer:
Sweets and chocolates attract germs. The germs feed on sweets and chocolates. In the process, the germs harm our teeth. This is the reason why Sheena’s mother tells her not to eat too many sweets and chocolates.
Question 6.
complete the given foodpath
Answer:
Mouth → Food pipe → Stomach→ Small Intestine → Large Intestine → Rectum→ Anus
Value Based Questions
Question 1.
What would you do if you were in Rahul’s place?
Answer:
I would have preferred to eat the food offered by Sanyam.
Question 2.
Sanyam tried to share his food with Rahul? In what situations do you share/help your friends?
Answer:
Whenever any of my friends forget to bring lunch box, I share my food with him/her. I also share many other things; like pencil, sharpener, eraser, etc. with them.
Question 3.
Do you think eating food from roadside vendors is a healthy option?
Answer:
Eatingfoodfromroadsidevendorsisnot a healthy option. The food at roadside vendor may be full of germs and dust. Eating such food can cause diseases.
Something To Do
Question 1.
Take some playing dough (clay) and a few peeled peanuts. Roll the clay in to the shape of jaw and place the peanuts the way your teeth are arranged on the jaws. Colour the flat teeth, pointed teeth and broad and grooved teeth in different colours. Do not forget to give proper shape to the peanuts.
Answer:
Do it yourself.
Question 2.
Visit the following websites for more information on the digestive system:
(a) www.makemeagenius.org
(b) www.scienceforkids.org
Answer:
Do it yourself.
DAV Class 4 Science Chapter 1 Solutions – My Body
I. Multiple Choice Questions:
1. Digestion begins from which part of the digestive system?
(a) Mouth
(b) Food pipe
(c) Stomach
(d) None of these
Answer:
(a) Mouth
2. Which gland is present in mouth?
(a) Liver
(b) Salivary gland
(c) Pancreas
(d) None of these
Answer:
(b) Salivary gland
3. Complete digestion of food happen in which part of the digestive system?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) None of these
Answer:
(b) Small intestine
4. Which is the largest gland in the human body?
(a) Salivary gland
(b) Pancreas
(c) Liver
(d) None of these
Answer:
(c) Liver
5. How many sets of teeth do we have in our lifetime?
(a) One
(b) Two
(c) Three
(d) None of these
Answer:
(b) Two
6. Within how many years after birth all the milk teeth appears?
(a) Two
(b) Three
(c) Six
(d) None of these
Answer:
(b) Three
7. Saliva digests which food substance?
(a) Protein
(b) Fat
(c) Starch
(d) None of these
Answer:
(c) Starch
II. Fill in the blanks:
Question 1.
The parts outside the body are called______ organs.
Answer:
External
Question 2.
The flat teeth are used for ______ and ______ the food.
Answer:
Cutting
Question 3.
The pointed teeth are used for ______ the food.
Answer:
Tearing, Biting
Question 4.
The broad teeth are used for ______ and ______ the food.
Answer:
Chewing, Grinding
Question 5.
There are ______ milk teeth.
Answer:
Twenty
Question 6.
There are ______ permanent teeth.
Answer:
Thirty two
Question 7.
Complete digestion of food takes place in______ intestine.
Answer:
Small.
III. Write True or False for the following:
1. Digestion begins from food pipe.
2. Complete digestion happens in stomach.
3. Complete digestion happens in small intestine.
4. Digested food is absorbed in large intestine.
5. Pancreas is the largest gland in human body.
6. Starch is changed into sugar.
7. Germs in food can make us sick.
Answer:
1. Digestion begins from food pipe. (True)
2. Complete digestion happens in stomach. (False)
3. Complete digestion happens in small intestine. (True)
4. Digested food is absorbed in large intestine. (False)
5. Pancreas is the largest gland in human body. (False)
6. Starch is changed into sugar. (True)
7. Germs in food can make us sick. (True)
IV. Match the following:
| Column A | Column B |
| 1. Mouth | (a) Semi-solid waste |
| 2. Stomach | (b) Absorbs water |
| 3. Small intestine | (c) Absorbs digested food |
| 4. Large intestine | (d) Partial digestion of food |
Answer:
| Column A | Column B | |
| 1. Mouth | e | (a) Semi-solid waste |
| 2. Stomach | d | (b) Absorbs water |
| 3. Small intestine | c | (c) Absorbs digested food |
| 4. Large intestine | b | (d) Partial digestion of food |
| 5. Rectum | a | (e) Digestion of starch |
V. Define the following:
Question 1.
Digestion
Answer:
The process of breaking down of complex nutrients into simple substances is called digestion.
Question 2.
Internal organ
Answer:
Organs which are inside the body are called internal organs.
Question 3.
Milk teeth
Answer:
The first set of teeth in human beings is called milk teeth. They fall off after a few years.
VI. Answer the following Questions in one word:
Question 1.
Name the digestive glands which are present in mouth.
Answer:
Salivary gland
Question 2.
Which is the longest part of the digestive system?
Answer:
Small intestine
Question 3.
Saliva converts starch into which substance?
Answer:
Sugar
Question 4.
Digested food is absorbed in which part of the digestive system?
Answer:
Small intestine
Question 5.
Excess water is absorbed in which part of the digestive system?
Answer:
Large intestine
Question 6.
Semi-solid waste is stored in which part of the digestive system?
Answer:
Rectum
VII. Answer the following Questions in one sentence:
Question 1.
What happens to the complex nutrients during digestion?
Answer:
During digestion, the complex nutrients are broken down into simple substances.
Question 2.
What is the function of flat teeth in our mouth?
Answer:
The flat teeth are used for cutting the food.
Question 3.
What is the function of pointed teeth?
Answer:
The pointed teeth are used for tearing the food.
Question 4.
What is the function of broad and grooved teeth?
Answer:
The broad and grooved teeth are used for chewing and grinding the food.
Question 5.
What happens to undigested semi-solid waste in the digestive system?
Answer:
The undigested semi-solid waste is collected in the rectum and is eliminated through anus.
VIII. Answer the following Questions briefly.
Question 1.
Explain the main types of teeth in humAnswer:
Answer:
There are three types of teeth. These are as follows:
(a) Flat Teeth: The flat teeth are in front of the mouth. These are used for biting and cutting the food. They are also known as incisors.
(b) Pointed Teeth: The pointedteeth are on the sides. These are used for tearing the food. They are also known as canines.
(c) Broad and Grooved Teeth: The broad teeth with grooves are present at the back of the mouth. These are used for chewing and grinding the food. They are also known as molars and premolars.
Question 2.
What are the functions of saliva?
Answer:
Functions of Saliva:
- Saliva mixes with the food and makes it soft.
- Saliva converts insoluble starch into soluble sugar.
Question 3.
Explain the structure and function of stomach.
Answer:
Stomach is a muscular bag-like organ. Food stays in stomach for a few hours. The walls of stomach secrete digestive juices. Food is partially digested in the stomach.
Question 4.
Explain the structure and function of small intestine.
Answer:
Small intestine is a long and coiled structure. Many digestive juices mix with food in the small intestine. Some digestive juices in the small intestine come from liver and pancreas. Food is completely digested in the small intestine. The walls of the small intestine absorb the digested food and pass it to blood.
Question 5.
Explain the structure and function of large intestine.
Answer:
Large intestine is thicker but shorter than small intestine. Excess water from food is absorbed by the walls of large intestine.
IX. Picture Based Question uestion
Question 1. Label the following figure as shown
Answer:
1. Mouth
2. Food pipe
3. Liver
4. Stomach
5. Small Intestine
6. Large Intestine
DAV Class 4 Science Chapter 1 Notes – My Body
→ External Organs: Organs which can be seen from outside are called external organs.
→ Internal Organs: The parts inside our body are called internal organs.
→ Digestive System: The digestive system in our body is composed of mouth, food pipe, stomach and intestines.
→ Digestion: The food contains carbohydrates, proteins, fats and other nutrients. These are complex materials. They are broken down into simple forms in our digestive system. The process of breaking down of complex nutrients into simple forms is called digestion.
→ Mouth: Mouth has different types of teeth and a tongue.
→ Teeth: There are three types of teeth. These are as follows:
- Flat Teeth: The flat teeth are in front of the mouth. These are used for cutting and biting the food.
- Pointed Teeth: The pointed teeth are on both the sides of flat teeth. These are used for tearing the food,
- Broad and Grooved Teeth: The broad teeth with grooves are present at the back of the mouth. These are used for chewing and grinding the food.
→ The human beings get two sets of teeth in the life. These are as follows:
- Milk Teeth: Milk teeth appear during the six months to three years after the birth. These are temporary teeth. They fall off after a few years. There are twenty milk teeth in humans.
- Permanent Teeth: The permanent teeth appear between the age of six and twelve. There are thirty two permanent teeth in humans.
→ Care of Teeth:
- Brush your teeth twice a day.
- Rinse your mouth after every meal.
- Avoid sweet food items and soft drinks.
- Take milk on regular basis.
- Eat fruits; like guava and apple; to exercise your gums.
→ Tongue: Tongue is a soft, movable part inside the mouth. Tongue is used for tasting, licking and for speaking. Tongue helps in pushing the food into the food pipe when we swallow the food.
→ Salivary Glands: The mouth also has three pairs of salivary glands. These glands secrete saliva.
→ Functions of Saliva:
- Saliva mixes with the food and makes it soft.
- Saliva converts insoluble starch into soluble sugar.
→ Stomach: Stomach is a muscular bag-like organ. Food stays in stomach for a few hours. The walls of stomach secrete digestive juices. Food is partially digested in the stomach.
→ Small Intestine: Small intestine is a long and coiled structure. Many digestive juices mix with food in the small intestine. Some digestive juices in the small intestine come from liver and pancreas. Food is completely digested in the small intestine. The walls of the small intestine absorb the digested food and pass it to blood.
→ Liver: Liver is the largest gland in the human body. It secretes bile which is an important digestive juice.
→ Pancreas: Pancreas is another gland in the human digestive system. Digestive juices from pancreas come to the small intestine.
→ Large Intestine: Large intestine is thicker but shorter than small intestine. Excess water from food is absorbed by the walls of large intestine.
→ Rectum: From large intestine, the undigested semi-solid waste is collected in the rectum. This waste is eliminated from rectum through anus.
→ Passage of Food in Digestive System:
Mouth → Food Pipe → Stomach → Small Intestine → Large Intestine → Rectum → Anus
→ Important things to remember while taking food:
- Eat a balanced diet.
- Eat green vegetables every day.
- Drink plenty of water.
- Wash hands before eating.
- Chew food properly before swallowing.
- Take food at fixed intervals.
- Drink about 8-10 glasses of water daily.
→ Sources of infections in food:
- Unwashed fruits and vegetables may carry germs of diseases. These germs can cause diarrhea, vomiting and other stomach ailments.
- Unwashed fruits and vegetables may carry eggs of worms. When these eggs reach the stomach they produce worms. These worms live in the stomach and small intestine and consume the food which is meant for the human body. A person with worms becomes weak and looks pale and unhealthy.
- Uncovered food is exposed to flies and dust. It can transfer germs into the body. This can cause many stomach problems; like jaundice, cholera, etc.
- Some Common Diseases of Digestive System: Vomiting, Diarrhea, Jaundice, Pain in abdomen, Cholera, etc.