RBSE Class 7 Science Important Questions Chapter 2 Nutrition in Animals

Rajasthan Board  RBSE Class 7 Science Important Questions Chapter 2 Nutrition in Animals Important Questions and Answers.

RBSE Class 7 Science Chapter 2 Important Questions Nutrition in Animals

Multiple Choice Questions

Question 1.    
The wave-like movement of food through the alimentary canal is called
(a) locomotion    
(b) pumping
(c) peristalsis    
(d) sliding
Answer:
(c) peristalsis    

Question 2.    
What is absorbed by the walls of the large intestine?    
(a) Cellulose    
(b) Glucose
(c) Oxygen    
(d) Water
Answer:
(d) Water

Question 3.    
Bile juice is secreted by which gland?
(a) Liver    
(b) Gall bladder
(c) Pancreas    
(d) Stomach
Answer:
(a) Liver

Question 4.    
During digestion proteins are changed into:
(a) sugar    
(b) glucose
(c) glycerol    
(d) amino add
Answer:
(d) amino add

Question 5.    
The alimentary canal starts from :
(a) esophagus    
(b) buccal cavity
(c) stomach    
(d) liver
Answer:
(b) buccal cavity

Fill in the blanks

Question 1.    
Ruminants are ..............chewing animals.    
Answer:
cud

Question 2.
..............is a microscopic single-celled organism found in the pond.
Answer:
Amoeba

Question 3.    
The swallowed food passes into the..............
Answer:
esophagus

Question 4.    
The region where most of the water is absorbed from the undigested food is called..............
Answer:
large intestine

Question 5.        
.............. is a process of elimination of undigested food or waste.
Answer:
Egestion

State Whether True or False

Question 1.    
Absorption and assimilation are similar processes.
Answer:
False

Question 2.    
The small intestine is about 7.5 m long.
Answer:
True

Question 3.    
The saliva breaks down the starch into protein.
Answer:
False

Question 4.    
Bees and hummingbirds swallow the nectar of flowers.    
Answer:
False

Question 5.    
The gall bladder temporarily stores bile.
Answer:
True
 
Match the following

Column I	Column II
1. Hydra	(a) Liver
2. Ruminants	(b) Saliva
3. Amylase	(c) Sucking
4. Villi	(d) Cow
5. Bile juice	(e) Small intestine
6. Pancreatic juice	(f) Anus
7. Ingestion	(g) ORS
8. Fecal matter	(h) Pancreas
9. Diarrhea	(i) Piercing
10. Canine	(j) Taking in food

Answer:

Column I	Column II
1. Hydra	(c) Sucking
2. Ruminants	(d) Cow
3. Amylase	(b) Saliva
4. Villi	(e) Small intestine
5. Bile juice	(a) Liver
6. Pancreatic juice	(h) Pancreas
7. Ingestion	(j) Taking in food
8. Fecal matter	(f) Anus
9. Diarrhea	(g) ORS
10. Canine	(i) Piercing

 

Very Short Answer Type Questions

Question 1. 
Write the names of some modes of feeding.
Answer: 
Scraping, chewing, siphoning, capturing, swallowing, sponging and sucking, etc.

Question 2. 
How does a frog capture prey?
Answer: 
A frog captures prey with its sticky tongue.

Question 3. 
How does an earthworm swallow its food?
Answer: 
An earthworm uses its muscular pharynx to swallow its food.

Question 4. 
How many incisors, canines, premolars, and molars are in an adult human?
Answer: 
An adult human has total of 8 incisors, 4 canines, 8 premolars and 12 molars.

Question 5. 
What is the function of canines? 
Answer: 
Canines are teeth, which help in piercing and tearing the food.

Question 6. 
What is the role of saliva?
Answer: 
The saliva breaks down the starch into sugar.

Question 7. 
What is the effect of amylase on starch?
Answer: 
Amylase enzyme is present in the saliva. It converts starch into sugar which can be easily digested.

Question 8. 
Name some major culprits of tooth decay.
Answer: 
Chocolates, sweets, soft drinks and other sugar products are the major culprits of tooth decay.

Question 9. 
What is cud?
Answer: 
In ruminants, the grass is stored in rumen where it is partially digested and called cud.

Short Answer Type Questions

Question 1. 
What is the mode of feeding of hydra?
Answer: 
Hydra uses numerous tentacles around their mouth. Hydra uses tentacles to surround its prey and kill them with its stinging cells. Then the food is pushed inside the cavity.

Question 2. 
What is peculiar about feeding habits in starfish?
Answer: 
Starfish feed on animals covered by hard shells of calcium carbonate. After opening the shell, the starfish pops out its stomach through its mouth to eat the soft animal inside the shell. The stomach then goes back into the body and the food is slowly digested.

Question 3. 
What are wisdom teeth?
Answer: 
Wisdom teeth are molar teeth that grow usually between the ages of 18 to 21 in a human. These are the last teeth to grow in a human being.

Question 4. 
Where are the liver and gall bladder located?
Answer: 
The liver is situated in the upper part of the abdomen on the right side and the gall bladder is located just below the stomach.

Question 5. 
What do you understand by digestive enzymes?
Answer: 
There are different types of enzymes that are used for the digestion of different food materials like carbohydrates, fats, proteins, etc. The process of digestion involves the association of different catalyst organic compounds which are called digestive enzymes. For example amylase, pepsin, trypsin, lipase, and sucrase.

Question 6. 
What will happen when food particles enter the windpipe?
Answer: 
When food particles enter the windpipe, we feel choked, get hiccups or cough. The reason behind this is that the windpipe carries air from the nostrils to the lungs.It runs adjacent to the food pipe. But inside the throat, air and food share a common passage.

Question 7. 
Write a short note on your stomach? 
Answer: 
The stomach is a thick-walled bag. Its shape is like a flattened J and it is the widest part of the alimentary canal. It receives food from the food pipe at one end and opens its other end into the small intestine. The inner lining of the stomach secretes mucus, hydrochloric add and digestive juices.

Question 8. 
What are the functions of mucus, hydrochloric acid and digestive juices secreted by the inner lining of the stomach?
Answer: 
The mucus protects the lining of the stomach. The hydrologic acid kills many bacteria that enter along with the food and makes the acidic medium in the stomach and the digestive juices help to break down the proteins into simpler substances.

Question 9. 
Why grass cannot be digested by humans?
Answer: 
Humans do not have a sac-like structure called caecum which is located between the small intestine and large intestine. The grass contains cellulose which is digested in the caecum by the action of certain bacteria. These bacteria are not present in humans were.

Question 10. 
What is diarrhea?
Answer: 
Diarrhea is a condition that involves frequent and liquid bowel movements and increases in the looseness of stool. It may be caused by an infection, food poisoning, or indigestion.

Question 11. 
What is ORS and where is it used?
Answer: 
Oral Rehydration Solution also called ORS is a boiled and cooled water in which a pinch of salt and sugar is dissolved. It is used as a primary medicine for a patient of diarrhea.

Question 12. 
How does amoeba digest the food?    
Answer: 
When amoeba since the food, it engulfs the food using pseudopodia. The food becomes trapped in a food vacuole. The digestive juice is secreted into the food vacuole. This juice breaks down the food into simpler substances. Gradually, the digested food is absorbed.

Long Answer Type Questions

Question 1. 
What is the tongue? Write its functions.
Answer: 
The tongue is a fleshy muscular organ attached at the back to the floor of the buccal cavity. It is free at the front and can be moved in all directions. We use our tongue for talking. Besides, it mixes saliva with the food during chewing and helps in swallowing food. We also taste food with our tongues. It has taste buds that detect different tastes of food.

Question 2. 
What is tooth decay?
Answer: 
Normally bacteria are present in our mouth but they are not harmful to us. However, if we do not clean our teeth and mouth after eating, many harmful bacteria also begin to live and grow in it. These bacteria break down the sugars present in the leftover food and release acids. The ads gradually damage the teeth. This is called tooth decay.