Get the simplified Class 7 Science Extra Questions and Class 7th Curiosity Chapter 9 Life Processes in Animals Important Extra Question Answer with complete explanation.
Class 7 Science Chapter 9 Life Processes in Animals Extra Questions
Class 7 Science Chapter 9 Extra Questions on Life Processes in Animals
Life Processes in Animals Class 7 Very Short Question Answer
Question 1.
Define digestion.
Answer:
It is defined as the process of breakdown of complex substances of food into simpler ones.
Question 2.
Describe alimentary canal briefly.
Answer:
Alimentary canal is the tube running from mouth to anus in animals including humAnswer: Here, digestion and absorption of food take place.
Question 3.
Name the secretions of stomach, that help to digest food.
Answer:
The inner lining of stomach secretes hydrochloric acid and digestive juices.
Question 4.
Name the parts of the alimentary canal where
(a) water gets absorbed from undigested food
(b) digested food gets absorbed
(c) the undigested food is eliminated
(d) bile juice is produced
Answer:
(a) Large intestine
(b) Small intestine
(c) Anus
(d) Liver
Question 5.
Carefully examine the image and identify where this Structure is found.
Answer:
These structures are present in small intestine.
Question 6.
What changes are observed in diaphragm during inhalation?
Answer:
During the process of inhalation, diaphragm contracts and moves downwards.
Question 7.
Which of these statement is correct for the respiratory system? Circle ‘Yes’ or ‘No’ for the correct response. Is the statement correct?
| Statement | Yes/No |
| (i) The ribs move in during exhalation. | Yes/No |
| (ii) The lungs constrict during inhalation. | Yes/No |
| (iii) The diaphragm expands during exhalation. | Yes/No |
Answer:
(i) Yes
(ii) No, the lungs expand during inhalation.
(iii) No, the diaphragm moves up during exhalation.
Question 8.
What could be the role of the hair and mucus present in the nostrils in terms of protecting the respiratory system?
Answer:
Our nostrils possess hairs and mucus lining. These help in preventing dirt, dust and germs from entering our respiratory system.
Question 9.
In an experiment, Ria exhale into a glass containing lime water. What changes would be observed by Ria?
Answer:
When Ria exhale into lime water, its colour changes to slightly milky white because the exhaled air contains CO2.
Question 10.
X refers to the respiratory organs in a tadpole. Identify what X stands for?
Answer:
Gills
Life Processes in Animals Class 7 Short Question Answer
Question 1.
List the preventive measures that one should adopt for avoiding tooth decay.
Answer:
Good oral hygiene is essential for preventing tooth decay and bad breath. Brushing teeth twice a day removes plaque and food particles, preventing bacterial buildup. Cleaning the tongue helps reduce bacteria that cause bad breath. Rinsing after meals removes leftover food and bacteria, maintaining a clean mouth. These habits keep your mouth fresh and healthy.
Question 2.
Boojho and Paheli were eating their food hurriedly so that they could go out and play during the recess. Suddenly, Boojho started coughing violently. Think of the reasons, why he was coughing and discuss with your friends?
Answer:
Sometimes, when we eat hurriedly, talk or laugh, while eating, the flap-like valve which closes the passage of windpipe remains open. Therefore, the food may enter into the windpipe. Coughing helps to clear the passage and returns the food particle back to the foodpipe.
Question 3.
‘A’ had her pancreas removed surgically due to a severe medical condition. After the surgery, she faced problems in digestion of various food items. Can you tell which kind of food items would they be and why?
Answer:
After the surgical removal of the pancreas, A’ would face problems in digestion of carbohydrates, proteins and fats. This is because the pancreas produces digestive enzymes (amylase, protease and lipase) that help in breaking down these nutrients in the small intestine.
Question 4.
Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Give reason.
Answer:
Ruminants such as cows and buffaloes swallow their food hurriedly and store it in a part of the stomach called rumen. The cellulose of the food is digested here by the action of certain bacteria, which are not present in humans. Later their partially digested food is returned to the buccal cavity of the animals in small lumps and animals chew it to complete the process of digestion. This process is called rumination.
Question 5.
What happens when breathe is released after holding for a few minutes? Give reason for its occurrence,
Answer:
Releasing breathe after holding it for some time results in rapid breathing. It occurs to maintain a healthy balance between intake of O2 and release of carbon dioxide.
Question 6.
Observe the given diagram of human respiratory system. List the organs from A to G.
Answer:
The human respiratory system has the following organs A-Ribs B-Trachea C-Pharynx D-Diaphragm E- Lungs F-Nasal passage G-Oral cavity
Question 7.
Frogs are amphibiAnswer: They survive on land and water, do they have any respiratory issue? How do frogs breathe when they are in water? Do they possess lungs?
Answer:
Frogs breathe by their moist skin and also through lungs. So, they do not have any respiratory issue. When frogs enter into water, the skin of frog helps in respiration. The oxygen rich air enters through the skin. When the frog is on land, a pair of lungs helps in respiration.
Question 8.
There are three animals named A, B and C. Among them, A can stay on both land and water. When it is on land, it respires through lungs, but when it is in water, it respires through its moist skin. Animal it has specific organs to respire in water, which is not found in any other aquatic animal. Animal C is a terrestrial animal that respires through its moist skin and does not have lungs. Now, give the names of animals A, B and C.
Answer:
- Animal A can live on both land and water and respires through lungs on land and moist skin in water. The nimal is a frog.
- Animal B lives in water and respires through gillsT The animal is a fish.
- Animal C is a terrestrial animal that respires through its moist skin and does not have lungs. The animal is an earthworm.
Life Processes in Animals Class 7 Long Question Answer
Questions 1.
Label the following parts of given figure and name them.
(a) The largest gland in our body.
(b) The organ where protein digestion starts.
(c) The organ that releases digestive juice into the small intestine
(d) The organ where digested food is absorb
Answer:
Questions 2.
Describe the process of digestion in the following organisms.
(i) Cow
(ii) Pigeon
Answer:
(i) Digestion in Cow (Ruminant Animal)
Cows are ruminants that eat grass, which is rich in cellulose. They chew the grass partially and swallow it into the rumen, the first chamber of their stomach, where microbes start breaking down cellulose. The partially digested food, called cud, is later brought back to the mouth for further chewing (rumination). After chewing, it goes through the other chambers of the stomach for complete digestion and then into the small intestine for nutrient absorption.
(ii) Digestion in Pigeon (Bird)
Pigeons do not have teeth, so food is swallowed directly. It first enters the crop, where it is stored and softened. Then it moves to the gizzard, a muscular chamber that grinds food with the help of swallowed stones or grit. The food then passes to the intestine, where enzymes digest it and nutrients are absorbed.
Questions 3.
(i) The process of breathing occurs in two phases. What are these two steps? Explain each briefly.
(ii) Explain the process of gaseous exchange.
Answer:
(i) Breathing is the physical process by which air moves in and out of the lungs. It includes two main steps
• Inhalation The process of taking in oxygen-rich air into the lungs.
• Exhalation The process of expelling air rich in carbon dioxide from the lungs.
(ii) Gaseous exchange is the process, where oxygen from the inhaled air passes into the blood and carbon dioxide from the blood moves into the lungs to be exhaled. This exchange takes place in the lungs, mainly in the tiny air sacs called alveoli, which are surrounded by blood capillaries.
Questions 4.
Observe the given figures labelled as A and B and answer the following questions.
(i) Among both figures identify which A or B indicates the process of inhalation and which shows the process of exhalation?
(ii) In the figure label the arrows and indicate the direction of (a) movement of air (b) movement of diaphragm (c) movement of ribs
Answer:
(i) Figure A indicates inhalation and figure B indicates exhalation.
(ii) Movement of air, diaphragm and ribs are indicated in below figure
Questions 5.
Observe the figures carefully and answer the following questions.
(i) Which process is being tested in the activity?
(ii) What is the result of the activity? Give reasons.
Answer:
(i) Exhalation process of respiration is being tested in the activity.
(ii) The lime water in test tube B turns milky, but water in test tube A remains unchanged. This is because C02 is present in the exhaled air, which mixes with lime water in test tube B and turns it milky.
Life Processes in Animals Class 7 Case Based Questions
Questions 1.
Bile juice is produced by the liver, a large reddish-brown gland located in the upper part of the abdomen. This juice plays a vital role in the digestion of fats. Although bile juice does not contain any digestive enzymes, it helps in the digestion process. Fats are not easy to digest because they are insoluble in water and exist as large globules. Bile juice helps by breaking down these large fat droplets into smaller ones, a process known as emulsification. These smaller droplets are then more easily acted upon by digestive enzymes released from the pancreas, allowing proper digestion in the small intestine.
(i) Which organ produces bile juice?
Answer:
The liver produced the bile juice.
(ii) In which part of the alimentary canal is bile released?
Answer:
Small intestine.
(iii) How does bile juice, along with pancreatic enzymes, support digestion in the small intestine?
Answer:
Bile juice breaks down large fat globules into smaller ones, making it easier for pancreatic enzymes to act on them and digest fats effectively.
(iv) What is the role of the small intestine in completing the digestion process?
Answer:
The small intestine is where digestion is completed. It receives digestive juices from the pancreas and liver and it also absorbs nutrients into the bloodstream through its walls.
(v) Can bile juice alone digest fats completely? Why or why not?
Answer:
No, bile juice does not digest fat completely. It only helps in breaking fats into smaller droplets, making them easier for enzymes to digest.
Life Processes in Animals Class 7 Skill Based Questions
Questions 1.
A person met with an accident while driving. After examination, the doctor told him that since he got a fracture in the wrist, operation would be required. After the operation, the patient was put on a glucose drip and was not given food for a few hours.
(i) Why was the patient not given food directly?
Answer:
After the operation, the patient’s body needs some time to recover. The digestive system may not work properly immediately after surgery. Giving solid food can cause vomiting or discomfort. That is why the patient is given glucose through a drip first.
(ii) How does glucose help the patient to recover?
Answer:
Glucose is a type of sugar that gives energy to the body. When the patient gets glucose through a drip, it provides instant energy without needing digestion. This helps the body recover faster after an operation.
Questions 2.
Take a chart paper and divide it into two sections longitudinally. In one section explain the process of digestion in humans and in other the process of digestion in cows. Compare both with the help of diagram and/or flowchart and write down the differences you found in both the cases.
Answer:
(i)
| Digestion in Humans | Digestion in Cows (Ruminants) |
| Food enters the mouth, where it is chewed and mixed with saliva. | Grass enters the mouth, is partially chewed and mixed with saliva. |
| Passes through the oesophagus to the stomach. | The partially chewed food passes down the oesophagus into the rumen (first part of stomach). |
| In the stomach, food is mixed with digestive juices and broken down. | In the rumen, food is partially digested with the help of microbes. |
| Moves to the small intestine, where enzymes complete digestion and nutrients are absorbed. | The partially digested food is brought back to the mouth. This process is called rumination. |
| Undigested food goes to the large intestine, where water is absorbed. | The cow chews the cud (chews again thoroughly), mixes it with saliva, and swallows it again. |
| Waste is passed out through the anus. | The food goes through the rest of the stomach parts (reticulum, omasum, abomasum), where digestion continues. |
 |
Finally, food moves through the intestines, where nutrients are absorbed and waste is passed out.
|
(ii)
| Humans | Cows |
| Have one stomach. | Have four stomach compartments. |
| Do not chew food again. | Chew food again (chew the cud). |
| Digestion is simpler. | Digestion is complex and involves microbes. |
| Food passes through the oesophagus to the stomach. | Partially chewed food is swallowed and passes through the oesophagus to the rumen. |
| Stomach breaks down food with acid. | Rumen stores and ferments food with bacteria. |
Questions 3.
A group of people were smoking cigarettes in a restaurant. The atmosphere was full of smoke. An old man sitting next to the group asked them to stop smoking, while sitting in the premises or move out. They agreed to do so and promised not to repeat the mistake. Answer the following questions.
(i) Write any three hazards of smoking.
Answer:
Any three hazards of smoking are as follows Causes lung diseases like cancer and asthma. Damages the heart and blood vessels. Makes it hard to breathe and lowers stamina.
(ii) Can smoking also affect the person who does not smoke?
Answer:
Yes. This is called passive smoking. When a person inhales smoke from others’ cigarettes, they can also suffer from health problems like lung issues, coughing, or heart disease.
Life Processes in Animals Extra Questions for Practice
Questions 1.
X is the condition in which the body shows a harmful reaction to gluten. Identify X.
Questions 2.
Which organ absorbs water from undigested food?
Questions 3.
Name the organ which helps the earthworm in respiration.
Questions 4.
Briefly describe the role of pancreas in a digestive system.
Questions 5.
Write the two functions of large intestine.
Questions 6.
What is the difference between breathing and respiration?
Questions 7.
Explain digestion. Draw a well-labelled diagram of a human digestive system and its associated gland. Also mention the role of every organ shown in the diagram.
Questions 8.
Draw a well-labelled diagram of human respiratory system.