Students can use Class 7 Science Curiosity Extra Questions and Chapter 9 Life Processes in Animals Extra Question Answer to prepare effectively at home.
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.
Where does journey of food begins?
Answer:
In mouth.
Question 2.
What are different parts of human alimentary canal?
Answer:
Mouth, buccal cavity oesophagus stomach and intestine.
Question 3.
What constitute human digestive system?
Answer:
Alimentary canal and its associated glands together constitute our digestive system.
Question 4.
What is the role of oesophagus?
Answer:
To push food ahead into stomach.
Question 5.
What are steps of respiration?
Answer:
The respiration is as following:
Glucose + Oxygen → Carbon dioxide + Water + Energy ↑
Question 6.
Name two grass eating animals.
Answer:
(a) Cow
(b) Buffalo
Question 7.
Do birds have teeth?
Answer:
No, they don’t have teeth.
Question 8.
Define breathing.
Answer:
It is defined as inhaling and exhaling of oxygen and carbon dioxide.
Question 9.
What is the role of a diaphragm?
Answer:
It plays roles in inhalation of oxygen and exhalation of carbon dioxide.
Question 10.
How do birds respire?
Answer:
By lungs.
Question 11.
Name the process by which energy is obtained by a living organism.
Answer:
Respiration.
Question 12.
What is the percentage of exhaled carbon dioxide during the breathing mechanism?
Answer:
Nearly 4-5%.
Question 13.
What is the length of the small intestine?
Answer:
About 6 meters.
Question 14.
Define the term egestion.
Ans:
The process of removal of faecal matter through the anus from time to time is called egestion.
Question 15.
What are ruminants?
Answer:
The animals in which partially digested food returns to the mouth and the animal chews it are called ruminants.
Question 16.
What is the role of the pancreas?
Answer:
The pancreas secrets pancreatic juice which is important for digestion process.
Question 17.
Which chemical would you select to test the presence of starch in the food item?
Answer:
Iodine solution
Question 18.
Name the organ that constitutes respiration in fish.
Answer:
Gills.
Question 19.
Where is water absorbed in the digestive system?
Answer:
Water is absorbed in the large intestine.
Life Processes in Animals Class 7 Short Question Answer
Question 1.
What is alimentary canal?
Answer:
Food is broken down in a long tube called alimentary canal. It starts with mouth and ends in anus.
Question 2.
What happens when chapati or rice break down into sugar?
Answer:
When saliva is mixed to rice or chapati, its digestive enzyme breaks starch into sugar.
Question 3.
Define digestion.
Answer:
It is break down of complex food components into simpler forms that can be absorbed by intestinal villi.
Question 4.
What is oesophagus?
Answer:
It is a tube that is long and flexible. It is called food pipe also. It does food move down into stomach by peristalsis.
Question 5.
Name three sources of digestive secretion into small intestine.
Answer:
(a) Inner lining of small intestine secrete digestive juices.
(b) Liver. It secretes bile juice
(c) Pancrease. It secretes pancreatic juice.
Question 6.
Give the function of diaphragm.
Answer:
It is a dome shaped structure, that move down wards in inhalation. It increase volume of chest cavity – Ribs move down and inwards – the diaphragm then moves upwards, push air out of lungs then.
Question 7.
How does fish respire?
Answer:
Fish respire by gills. Fish is aquatic animal. Gills are like slits having many gill filaments which have rich blood supply too. Blood absorb O2 from water. CO2 is given out by blood too.
Question 8.
How do amphibious respire?
Answer:
Frog is amphibian. It has gills in tadpole stage for respiration. Adult frog possesses lungs to breathe and respire, when in water frogs exchange O2 and CO2 by skin. This is an adaption to stay in water as well as on soil/land.
Question 9.
Mention functions of each:
(a) Liver
(b) Pancreas
(c) Villi
(d) Food pipe
Answer:
(a) Liver secretes bile juice. Bile juice helps in digestion of fats.
(b) Pancreas produces pancreatic juice that digests fats, proteins and carbohydrates at all.
(c) Villi are minute structures found in small intestine. They help in absorption of digested food to blood.
(d) Food pipe is esophagus, a long but flexible tube. It walls contract and relax to churn food. It is called peristalsis.
Question 10.
Give a short account of respiratory system.
Answer:
It has specific role of breathing as well as respiration. Respiratory system consists of lungs, trachea, wind pipe, nostrils, nasal passage etc. It starts with nostrils (through them air is inhated into lungs and air is also exhaled). Inhaled air now posses into nasal passage. Air is reached to lungs by means of trachea.
Question 11.
What is breathing rate? Give example.
Answer:
Number of times a person breathes in a minute is known as breathing rate. e.g., a normal breathing rate at rest is 12-24 times/ minute. Moreover this rate increases during heavy exercise at all.
Question 12.
Make two differences in Breathing and Respiration. (V.Imp.)
Answer:
Difference between Breathing and Respiration
| Breathing | Respiration |
| 1. It is a physical process. | 1. It is a chemical process. |
| 2. In it O2 is taken in but CO2 is given out. | 2. Breakdown of foods occur to release energy too. |
Question 13.
Explain rumination. Why cow is called a ruminant animal?
Answer:
Cow is grass eating animal. It partially chews grass. It swallow grass into their stomach. Partial digestion takes place here. The partially digested food is then returned to mouth for chewing slowly. This is known as rumination. So cow is called a ruminant animal.
Question 14.
How does birds eat as they don’t have teeth?
Answer:
Birds don’t have teeth, they have gizzard to chunk food. By contraction and relaxation, food is broken down with help of grit that are also swallowed by a bird too.
Question 15.
What processes occur in large intestine of humans?
Answer:
Most of the nutrients are absobed in small intestine. Then, undigested food moves to large intestine from small intestine. About 1.5 m length is observed of it. It is very smaller to small intestine. It is also called rectum. It is wider than small intestine. Water and some salts are absorbed by it. Most of water is absorbed by it. The undigested food becomes solid or semi solid. It is known as stool that is passed to outside by retal opening the anus. Stool is passed out by a process called egestion.
Question 16.
Why should we breathe through our nose?
Answer:
There are hairs present in our nasal passage. The hair entrap dust particles. These do not allow them to reach lungs. So, inhaled air becomes dust-free and clean. If, by chance these dust particles get passed, hair in our nasal cavity, sensory lining of the nasal cavity gets irritated. As a result we sneeze. The sneezing throws out these foreign dust particles from air inhaled at all.
Question 17.
Can you feel the breathing movements in your body?
Answer:
Yes, we feel breathing movements in our body. They can easily be felt by taking a deep breathe and keeping your palm on abdomen too. Movement of abdomen and expansion of our chest cavity can be felt with your palm.
Question 18.
What is peristalsis ? Explain in short.
Answer:
The wall of esophagus contract and relax to form a wave called peristalsis. It rushes food into stomach. Peristalsis refers to rhythmic contraction and relaxation of muscles in esophagus to push food forward.
Question 10.
Digestion in small intestine is carried out by help of liver and pancreas. Explain.
Answer:
Wall of intestine secretes juices. Liver secretes bile (stored in gallbladder). Pancreas secretes pancreatic juice that help to digest proteins, fats, and carbohydrates. The liver helps in the digestion of fats.
Life Processes in Animals Class 7 Long Question Answer
Question 1.
Explain with the help of a diagram, the process of digestion in human. Mention the role of different organs.
Answer:
Digestion in humans is the process of breaking down food into simpler substances that can be absorbed by the body. It involves several organs:
Mouth: Food is chewed and mixed with saliva which contains the enzyme amylase that starts the digestion of starch.
Oesophagus: Transports food to the stomach through a wave-like movement called peristalsis.
Stomach: Produces gastric juices (including pepsin and hydrochloric acid) that help break down proteins.
Small intestine: It is the main site for digestion and absorbtion. Enzymes from the pancreas and bile from the liver help digest fats, proteins and carbohydrates. The inner walls have villi that absorb nutrients into the blood.
Large intestine: Absorbs water from undigested food and forms solid waste.
Anus: Removes the waste materials from the body (egestion).
Question 2.
Describe the structure and function of the stomach and small intestine in the human digestive system.
Answer:
The stomach is a U-shaped muscular organ that temporarily stores food. It produces gastric juices containing hydrochloric acid and enzymes like pepsin that help digest protein. It also churns food to mix it with digestive juices.
The small intestine is a long, coiled tube where most of the digestion and absorption takes place. It receives bile from the liver and digestive enzymes from the pancreas. The walls of the small intestine are lined with villi which increase the surface area for absorbing nutrients into the blood.
Question 3.
What part of the digestive system is included in
(a) Killing bacteria
(b) Chewing of food
(c) Absorption of water
(d) Storage of undigested food
(e) Complete digestion of food
Answer:
(a) Stomach of human beings.
(b) Mouth – Saliva is mixed to it.
(c) Absorption of water occurs in large intestine/rectum.
(d) Undigested food is stored in rectum, last part of alimentary canal.
(e) Complete digestion of food occurs in small intestine. Here carbohydrates, fat, proteins are digested at all.
Question 4.
How do saliva help in digestion?
Answer:
Saliva is secreted in mouth. It is secreted by pairs of salivary glands. It digest starch into simple sugars. It digest rice that contains starch. So it helps in the chemical digestion of sugars. It is slippery so that food is mixed to it and pushes ahead to enter in food pipe.
Question 5.
How the food you eat gives energy?
Answer:
We eat food, it gives us energy to work, to walk etc. O2 helps to break it into simple substances and release energy.
Glucose + Oxygen → H2 O + CO2 + Energy
So oxygen breaks down glucose to provide energy. Water and carbon dioxide are formed also. The whole process is called the respiration.
Question 6.
What is nutrition? Give its steps.
Answer:
Nutrition refers to intake of food, its digestion, absorption, assimilation and egestion. The food is taken in body by ingestion. In digestion, complex food is broken down to simpler substances. The digested nutrients are diffused into body fluids like blood. Using absorbed food to give energy is assimilation. Removal of undigested food from body is egestion.
Question 7.
How does absorption occur ?
Answer:
Digested food is absorbed in small intestine by villi. They are finger like projection in wall of small intestine. They increase surface area for food absorption. Each villus contain blood capillaries close to its surface. The absorbed food posses into blood via blood capillaries.
Question 8.
Differentiate between respiration and breathing.
Answer:
| Feature | Breathing | Respiration |
| Types of process | Physical process | Chemical process |
| Involves | inhaling oxygen and exhaling carbon dioxide | Breaking down food (glucose) using oxygen to release energy. |
| Occurs in | Lungs and air passages | Cells throughout the body |
| Purpose | To bring in oxygen and remove carbon dioxide | To produce energy from body functions. |
| Requires energy | No | Yes |
| Produces | Only exchange of gases | Energy (ATP) carbon dioxide and water. |
| Control | Can be voluntary or involuntary | Completely involuntary. |
Life Processes in Animals Class 7 Case Based Questions
1. Read the following passage carefully and answer the questions that follow:
The respiration is a process that occurs all the time i.e., during day and night. It is of 2 types aerobic (in the presence of oxygen) and anaerobic (in the absence of oxygen). Aerobic respiration occurs in both plants and animals. In both cases, intake of oxygen and release of water and carbon dioxide occur. Both oesophagus and trachea open into pharynx. It serves as a common passage for both food and air. The alveoli are richly supplied with blood vessels. O2 present in air we breath in, goes into blood flowing in blood vessels of alveoli. CO2 present in blood passes out of blood vessels into alveoli. Exchange of gases occur in alveoli of the lungs.
(i) Which of these is not true about respiration ?
(a) Redigest food
(b) Occurs only during day
(c) Utilizes oxygen exhales carbon dioxide
(d) None of these
Answer:
(b) Occurs only during day
(ii) Which of following organs serves as common passage for both food and air ?
(a) Pharynx
(b) Larynx
(c) Oesophagus
(d) Trachea
Answer:
(a) Pharynx
(iii) Where in respiratory system does oxygen from the air breathed in passes into the blood ?
(a) Trachea
(b) Bronchi
(c) Bronchioles
(d) Alveoli
Answer:
(c) Bronchioles
2. Read the following passage carefully and answer the questions that follow:
In an experiment, students placed boiled rice in two test tubes. In one tube, the rice was chewed before placing. Iodine was added to both. The unchewed rice turned blue-black, but the chewed one did not. This experiment showed that saliva breaks down starch into sugar, hence no starch was left to react with iodine in the second test tube.
(i) What does the blue-black colour in the test tube indicate?
(a) Presence of protein
(b) Presence of sugar
(c) Presence of starch
(d) Presence of fat
Answer:
(c) Presence of starch
(ii) Why didn’t the chewed rice turn blue-black with iodine?
(a) It had less iodine
(b) Saliva converted starch to sugar
(c) It contained protein
(d) It was overcooked
Answer:
(b) Saliva converted starch to sugar
(iii) Which enzyme in saliva helps break down starch?
(a) Lipase
(b) Pepsin
(c) Amylase
(d) Trypsin
Answer:
(c) Amylase
(iv) What is the conclusion of the experiment with chewed rice and iodine?
(a) Starch is produced in the mouth
(b) Chewing rice increases its starch
(c) Saliva begins digestion of starch
(d) Iodine turns red in presence of sugar
Answer:
(c) Saliva begins digestion of starch
Life Processes in Animals Class 7 Picture Based Questions
1. Look at the figure and answer the following questions:
(i) Label the diagram.
Answer:
1. Mouth
2. Windpipe
3. Liver
4. Stomach
5. Pancreas
6. Small intestine
7. Large intestine
8. Ractum
9. Anus.
(ii) Identify the figure:
(a) Alimentary canal of human
(b) Alimentary canal of women
(c) Both of these
(d) None of these
Answer:
(ii) – (a)
2. Look at the figure and answer the following questions:
(i) What does the above diagram show?:
(a) Movement of air
(b) Movement of food
(c) Both (a)-(b)
(d) None of these
Answer:
(b) Movement of food
(ii) Through which body part food swallowed to stomach?
(a) Oesophagus
(b) Wind pipe
(c) Liver
(d) None of these
Answer:
(a) Oesophagus
(iii) Oesophagus is also called:
(a) Wind pipe
(b) Stomach
(c) Food pipe
(d) None of these
Answer:
(c) Food pipe
Life Processes in Animals Extra Questions for Practice
Multiple Choice Questions (MCQs):
Question 1.
Liver and pancreas, release their secretions into:
(a) large intestine
(b) small intestine
(c) stomach
(d) oesophagus
Question 2.
Animal get energy from:
(a) food
(b) bases
(c) acids
(d) none of these
Question 3.
Largest gland in human body is:
(a) pancreas
(b) stomach
(c) kidney
(d) liver
Question 4.
Mechanical digestion occurs in:
(a) mouth
(b) oesophagus
(c) stomach
(d) intestine
Question 5.
Which of the following set of organs is involved in the digestion of food?
(a) Pancreas, liver and stomach
(b) Stomach, oesophagus and kidney
(c) Heart, pancreas and stomach
(d) Liver, pancreas and lungs
Question 6.
Stool is stored in:
(a) Rectum
(b) Small intestine
(c) Both (a) and (b)
(d) None of these
Question 7.
The air is exchanged in which part of the human respiratory system?
(a) Trachea
(b) Bronchi
(c) Larynx
(d) Alveoli
Question 8.
Which of these is a respiratory organ of fish?
(a) Nose
(b) Gills
(c) Lungs
(d) None of these
Very Short Answer Type Questions:
Question 1.
Why do organisms take food?
Question 2.
Do all animals have same mode of nutrition?
Question 3.
Name the secretion of the liver. Where is it stored?
Question 4.
What is effect of saliva on starch?
Question 5.
Give the function of mucus secreted by the stomach.
Question 6.
Where is bile stored?
Question 7.
Name the carbohydrate that can be digested by ruminants like cow, buffalo.
Question 8.
Can we survive on grass?
Short Answer Type Questions:
Question 1.
Why does fish die when fish is taken out of water?
Question 2.
When we hold breath for a few minutes, then release it. You have to breathe heavily after that. Why does it happen?
Question 3.
Write down functions of mucus and acid in stomach.
Question 4.
What are villi ? What are their functions?
Question 5.
How does fruit help in digestion?
Question 6.
How do we breathe?
Question 7.
Animals exhibit variations in alimentary canal. How?
Question 8.
Give word equation of the process of respiration in humans.
Question 9.
Birds do not have teeth. Why?
Question 10.
Small intestine receives digestive juices from three sources. What are they?
Long Answer Type Questions:
Question 1.
Getting energy from food we have two systems in our body to coordinate digestion of food. What are they? How do these help in digestion of food?
Question 2.
How does digestine system help in digestion and removal of wastes?
Question 3.
What are villi ? What their role in absorption of nutrients in small intestine?
Question 4.
When does a patient need drip of glucose? How is it useful to a patient?
Question 5.
Draw figures to show gaseous exchange in alveoli.