CBSE Class 7 Science Chapter 09 Life Processes In Animals MCQs Set 01

Multiple Choice Questions (MCQs) for Class 7 Science: Chapter 09 Life Processes In Animals

Review structured MCQ sets for Class 7 Science Chapter 09 Life Processes In Animals. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Practice Chapter 09 Life Processes In Animals MCQs for Class 7 Science

Access the complete set of multiple-choice questions for Chapter 09 Life Processes In Animals below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

Question: When you think of your favourite food and your mouth feels watery, what is the primary function of the saliva being released?
A. To neutralize stomach acid
B. To begin breaking down starch into simpler sugars
C. To protect the teeth from decay
D. To moisten food for easier swallowing only
Show Answer & Explanation

Answer: (B) To begin breaking down starch into simpler sugars

Explanation:
Saliva contains a digestive enzyme that helps break down starch into sugar, which is why starchy foods taste sweet when chewed for a long time.

Question: In the experiment with boiled rice and iodine solution, why did the unchewed rice in test tube A turn blue-black while the chewed rice in test tube B showed little or no colour change?
A. Chewing added iodine to the rice
B. Saliva had already converted the starch into simpler sugars in test tube B
C. Heat from chewing destroyed the starch molecules
D. The chewed rice was no longer able to react with iodine
Show Answer & Explanation

Answer: (B) Saliva had already converted the starch into simpler sugars in test tube B

Explanation:
• Iodine turns blue-black in the presence of starch
• In test tube B, saliva broke down starch during chewing
• Little or no starch remained to react with iodine in test tube B

Question: What is the primary reason the small intestine is described as the longest part of the alimentary canal despite its name?
A. It has a wider diameter than other parts
B. It is approximately 6 metres long when stretched out
C. It absorbs more nutrients than any other organ
D. It contains more digestive juices than the stomach
Show Answer & Explanation

Answer: (B) It is approximately 6 metres long when stretched out

Explanation:
The small intestine is called 'small' because of its narrow width, not its length. When stretched out, it measures almost 6 metres—nearly twice the height of a classroom.

Question: Which of the following best describes the relationship between the liver, pancreas, and small intestine in digestion?
A. They compete for control of the digestive process
B. They all secrete digestive juices that work together in the small intestine
C. Only the liver contributes to digestion in the small intestine
D. The small intestine produces all the digestive chemicals needed without outside help
Show Answer & Explanation

Answer: (B) They all secrete digestive juices that work together in the small intestine

Explanation:
The liver secretes bile to break down fats, the pancreas secretes pancreatic juice to neutralize acids and break down various nutrients, and the small intestine itself secretes additional digestive juices—all working together.

Question: Why do ruminant animals like cows spend about 8 hours a day chewing, even when they are not actively eating?
A. They are ensuring their teeth remain strong
B. They are bringing back partially digested food to the mouth for thorough chewing through rumination
C. They are producing more saliva to aid digestion
D. They are preventing food from spoiling in their stomachs
Show Answer & Explanation

Answer: (B) They are bringing back partially digested food to the mouth for thorough chewing through rumination

Explanation:
Rumination is a digestive process where grass-eating animals regurgitate partially digested food from the stomach back to the mouth for gradual and thorough chewing before it passes through the alimentary canal again.

Question: How do birds compensate for the absence of teeth during food digestion?
A. They have a specialized muscular chamber called a gizzard that contracts and relaxes to break down food
B. They secrete stronger digestive acids in their stomach
C. They swallow food whole and rely entirely on stomach acid
D. They have evolved extra-large salivary glands
Show Answer & Explanation

Answer: (A) They have a specialized muscular chamber called a gizzard that contracts and relaxes to break down food

Explanation:
Birds possess a gizzard where food is mechanically broken down through contractions and relaxation of the chamber walls, often with the help of grit (small stones) they swallow for this purpose.

Question: What is the key difference between breathing and respiration as described in the chapter?
A. Breathing occurs only in lungs while respiration occurs throughout the body
B. Breathing is a physical process of inhaling and exhaling, while respiration is a chemical process that uses oxygen to break down nutrients for energy
C. Respiration is voluntary while breathing is involuntary
D. They are essentially the same process with different names
Show Answer & Explanation

Answer: (B) Breathing is a physical process of inhaling and exhaling, while respiration is a chemical process that uses oxygen to break down nutrients for energy

Explanation:
Breathing involves the mechanical movement of air in and out of the lungs. Respiration, by contrast, is the chemical process where glucose is broken down using oxygen to produce energy, carbon dioxide, and water—this happens inside body cells.

Question: In the lung model activity using balloons and a rubber sheet, what physiological structures do these components represent?
A. The balloons represent alveoli and the rubber sheet represents the windpipe
B. The balloons represent lungs and the rubber sheet represents the diaphragm
C. The balloons represent the chest and the rubber sheet represents the rib cage
D. The balloons represent the nasal passages and the rubber sheet represents mucus membranes
Show Answer & Explanation

Answer: (B) The balloons represent lungs and the rubber sheet represents the diaphragm

Explanation:
In this model, the balloons function as lungs, inflating when the rubber sheet is pulled down (mimicking diaphragm movement during inhalation) and deflating when it is released upward (mimicking exhalation).

Question: According to Activity 9.3, what can be concluded from the fact that exhaled air turns lime water milky while inhaled air does not?
A. Exhaled air contains oxygen that reacts with lime water
B. Exhaled air contains significantly more carbon dioxide than inhaled air
C. Inhaled air has been purified of all carbon dioxide
D. Lime water only reacts with air that has passed through the lungs
Show Answer & Explanation

Answer: (B) Exhaled air contains significantly more carbon dioxide than inhaled air

Explanation:
Lime water turns milky when it reacts with carbon dioxide. Since the exhaled air produced this change while inhaled air did not, it demonstrates that exhaled air contains substantially more carbon dioxide than the air we breathe in.

Question: What is the primary function of the alveoli in the human respiratory system?
A. To filter dust and dirt from inhaled air
B. To produce mucus that protects the lungs
C. To serve as the site for gas exchange between air and blood
D. To strengthen the structure of the lungs
Show Answer & Explanation

Answer: (C) To serve as the site for gas exchange between air and blood

Explanation:
Alveoli are small balloon-like sacs at the ends of the finer branches in the lungs where oxygen from inhaled air passes into the blood and carbon dioxide from the blood is released into the air to be exhaled.

Question: How do the finger-like projections on the inner lining of the small intestine contribute to its digestive function?
A. They produce additional digestive enzymes
B. They increase the surface area for efficient absorption of digested nutrients into the blood
C. They prevent food from moving too quickly through the intestine
D. They break down proteins into amino acids
Show Answer & Explanation

Answer: (B) They increase the surface area for efficient absorption of digested nutrients into the blood

Explanation:
These thousands of projections, called villi, dramatically increase the inner surface area of the small intestine, allowing for more efficient absorption of digested nutrients into the bloodstream.

Question: Which statement best explains why we should breathe through the nose rather than through the mouth?
A. The nose produces more oxygen than the mouth
B. Tiny hairs and mucus in the nasal passages help trap dust and dirt from the air we breathe
C. The nose warms air more effectively than the mouth
D. Mouth breathing uses more energy
Show Answer & Explanation

Answer: (B) Tiny hairs and mucus in the nasal passages help trap dust and dirt from the air we breathe

Explanation:
The nasal passages contain tiny hairs and mucus that serve as filters, trapping dust and dirt particles before air reaches the lungs, thereby protecting the respiratory system from unwanted particles.

Question: In the context of the chapter, what is meant by the term 'egestion'?
A. The process of breaking down food in the stomach
B. The absorption of nutrients through the small intestine
C. The removal of undigested waste material from the body through the anus
D. The secretion of bile from the liver
Show Answer & Explanation

Answer: (C) The removal of undigested waste material from the body through the anus

Explanation:
Egestion refers to the final expulsion of stool (undigested waste) through the anus after the large intestine has absorbed water and salts from the remaining material.

Question: Why is it significant that the exhaled air contains approximately 16–17% oxygen while inhaled air contains about 21% oxygen?
A. It proves that the lungs are not functioning efficiently
B. It demonstrates that the body uses only a fraction of the available oxygen during respiration, with some remaining unused
C. It shows that oxygen is being created in the lungs
D. It indicates that carbon dioxide is being converted back into oxygen
Show Answer & Explanation

Answer: (B) It demonstrates that the body uses only a fraction of the available oxygen during respiration, with some remaining unused

Explanation:
The difference shows that while we inhale oxygen-rich air, our body utilizes only part of it for respiration. The remaining oxygen is exhaled, along with increased carbon dioxide, reflecting the selective use of oxygen by body cells.

Question: Which of the following best describes how the structure of an animal's digestive system reflects its feeding habits?
A. All animals have identical digestive systems regardless of what they eat
B. Ruminants like cows have a specialized rumen to re-chew plant material, while birds lack teeth but possess a gizzard to grind food
C. Fish have more efficient digestive systems than land animals
D. Herbivores and carnivores have the same digestive tract
Show Answer & Explanation

Answer: (B) Ruminants like cows have a specialized rumen to re-chew plant material, while birds lack teeth but possess a gizzard to grind food

Explanation:
• Ruminants possess a rumen for regurgitation and re-chewing of plant material
• Birds have no teeth but compensate with a muscular gizzard
• These adaptations show how digestive structures vary with diet and habitat

Question: What role does the circulatory system play in connecting the processes of digestion and respiration?
A. It produces oxygen for the lungs to use
B. It transports absorbed nutrients from the digestive system and oxygen from the respiratory system to body cells for energy production
C. It neutralizes acids produced during digestion
D. It produces digestive enzymes
Show Answer & Explanation

Answer: (B) It transports absorbed nutrients from the digestive system and oxygen from the respiratory system to body cells for energy production

Explanation:
The circulatory system, consisting of the heart and blood vessels, delivers both the nutrients absorbed from digested food and oxygen obtained from breathing to all body cells, enabling them to produce energy through respiration.

Question: During mechanical digestion in the mouth, what happens to food before it enters the oesophagus?
A. It is completely broken down into glucose molecules
B. It is crushed and chewed into smaller pieces by the teeth
C. It is mixed with bile from the liver
D. It is partially absorbed through the mouth lining
Show Answer & Explanation

Answer: (B) It is crushed and chewed into smaller pieces by the teeth

Explanation:
The chapter describes mechanical digestion as the process of initial breakdown of food into fine pieces through crushing and chewing by the teeth in the mouth cavity.

Question: Which of the following best describes the wave-like motion that moves food through the food pipe?
A. Gravity pulling the food downward
B. Contraction and relaxation of the walls in sequence
C. The tongue pushing food continuously
D. Acid from the stomach pulling the food down
Show Answer & Explanation

Answer: (B) Contraction and relaxation of the walls in sequence

Explanation:
The walls of the food pipe gently contract and relax in a wave-like motion to push the food down into the stomach. This movement takes place throughout the alimentary canal.

Question: In the stomach, what is the protective function of mucus secreted from the inner lining?
A. It helps break down carbohydrates
B. It neutralises acids from the food
C. It protects the stomach lining from damage by acid
D. It absorbs nutrients from the food
Show Answer & Explanation

Answer: (C) It protects the stomach lining from damage by acid

Explanation:
The mucus protects the stomach lining from the acid, preventing damage to the stomach walls.

Question: Why is the large intestine called 'large' if it is shorter than the small intestine?
A. It stores more waste material
B. It is wider in diameter than the small intestine
C. It performs more important functions
D. It has a longer surface area for absorption
Show Answer & Explanation

Answer: (B) It is wider in diameter than the small intestine

Explanation:
The large intestine is about 1.5 metres long, shorter than the small intestine, but it is called 'large' because it is wider in diameter.

Question: What is the purpose of the diaphragm during inhalation?
A. To filter dust from the air
B. To produce sound for communication
C. To move downward and increase space in the chest for air entry
D. To prevent harmful bacteria from entering the lungs
Show Answer & Explanation

Answer: (C) To move downward and increase space in the chest for air entry

Explanation:
During inhalation, the diaphragm moves downward, which increases the space inside the chest and allows air to enter the lungs.

Question: Which adaptation allows tadpoles and adult frogs to survive in both aquatic and terrestrial environments?
A. They develop teeth for chewing different foods
B. Tadpoles use gills while adults use lungs and skin for gas exchange
C. They store oxygen in special organs
D. They switch between two different circulatory systems
Show Answer & Explanation

Answer: (B) Tadpoles use gills while adults use lungs and skin for gas exchange

Explanation:
Amphibians like frogs use different body parts for breathing at various stages of their life—tadpoles breathe through gills, while adult frogs use lungs for breathing on land and skin for gas exchange in water.

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Practice MCQs for Class 7 Science Chapter 09 Life Processes In Animals

Class 7 Science Chapter 09 Life Processes In Animals Objective Test Questions

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FAQs

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Are Assertion-Reasoning and Case-Study MCQs included in the Science Class 7 material?

Yes, our CBSE Class 7 Science Chapter 09 Life Processes In Animals MCQs Set 01 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.

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