Life Processes in Animals — Mastery

Q1. Which of the following processes is NOT mentioned as a life process in the chapter 'Life Processes in Animals'?

• A. Nutrition
• B. Respiration
• C. Transpiration
• D. Reproduction

Q2. According to the chapter, which of the following is a complex food component that must be broken down into simpler forms before the body can use it?

• A. Water
• B. Glucose
• C. Fat
• D. Mineral salts

Q3. The chapter notes that 'snakes, like python, swallow the animals they prey upon'. This example is used to illustrate that

• A. All snakes are venomous predators
• B. Different animals eat different types of food in different ways
• C. Pythons do not need to digest food
• D. Snakes use teeth to chew like cows do

Q4. A Class 7 student says, 'When I chew rice for a long time, it tastes sweeter and sweeter.' The best science explanation is that

• A. The longer she chews, the more saliva acts on starch and breaks it into sugar
• B. The teeth release sugar from inside the rice grain
• C. Chewing destroys the chemical bonds inside sugar molecules
• D. The tongue stops noticing other tastes after some time

Q5. The wave-like movement that pushes food along the alimentary canal occurs in

• A. Only the oesophagus
• B. Only the stomach
• C. Only the small intestine
• D. Throughout the alimentary canal

Q6. The acid in the stomach does TWO important things at the same time. These are

• A. Breaks down fat and absorbs nutrients
• B. Helps break down proteins and kills many harmful bacteria in food
• C. Produces saliva and softens the food
• D. Stores stool and pushes food forward

Q7. Which of the following correctly arranges these three parts in the order from shortest to longest? P — Oesophagus (food pipe) Q — Large intestine R — Small intestine

• A. R, Q, P
• B. Q, R, P
• C. P, Q, R
• D. P, R, Q

Q8. Celiac disease damages the inner lining of the small intestine, where nutrients are absorbed. A doctor advises a celiac patient to switch to which of the following?

• A. More wheat-based foods like roti
• B. More barley- and rye-based foods
• C. Millets such as jowar, bajra and ragi, which are naturally gluten-free
• D. More raw meat and eggs

Q9. The semi-solid undigested waste, called stool, is stored in which part of the alimentary canal until the body is ready to get rid of it?

• A. Anus
• B. Small intestine
• C. Stomach
• D. Rectum

Q10. According to the chapter, which of the following Indian fermented foods is mentioned as being good for a healthy digestive system?

• A. Curd, kanji and shrikhand
• B. Tea, coffee and cola drinks
• C. Boiled potato, rice and chapati
• D. Sugar, ghee and butter

Q11. Ravi watches a cow in his village. The cow grazes for some time, then sits down and keeps chewing even though it is no longer eating fresh grass. According to the chapter, the cow is doing this because

• A. It is bored and chewing on its own tongue
• B. It first partially chewed and swallowed grass, then brought it back to chew thoroughly
• C. It is producing saliva to spit at insects
• D. It is trying to digest the grass without using its stomach

Q12. Match each respiratory part with its function: (i) Nostrils — (a) Fresh air from outside enters (ii) Nasal passages — (b) Tiny hair and mucus trap dust and dirt (iii) Windpipe — (c) Air reaches the lungs through this part (iv) Alveoli — (d) Exchange of gases occurs (v) Rib cage — (e) Protects the lungs Which option matches all correctly?

• A. (i)-a, (ii)-b, (iii)-c, (iv)-d, (v)-e
• B. (i)-b, (ii)-a, (iii)-c, (iv)-d, (v)-e
• C. (i)-a, (ii)-d, (iii)-c, (iv)-b, (v)-e
• D. (i)-c, (ii)-b, (iii)-a, (iv)-d, (v)-e

Q13. Which of the following best describes 'breathing' as defined in this chapter?

• A. The chemical reaction in cells that releases energy from food
• B. The exchange of oxygen and carbon dioxide between blood and tissue
• C. The process of inhaling and exhaling air
• D. The transport of oxygen by blood to different parts of the body

Q14. If inhaled air contains nearly 0.04% carbon dioxide and exhaled air contains nearly 4–5% carbon dioxide, the CO₂ in exhaled air is approximately how many times more than in inhaled air?

• A. About twice
• B. About 10 times
• C. About 100 times
• D. About the same

Q15. Why are the walls of the alveoli thin and richly surrounded by fine blood vessels?

• A. To make the lungs lighter so we can breathe easily
• B. To allow easy and fast exchange of oxygen and carbon dioxide between air and blood
• C. To store extra oxygen for emergencies
• D. To prevent dust from reaching the chest

Q16. Priya feels her mouth become watery just thinking about her favourite dosa. The most appropriate science explanation is that

• A. Her teeth begin to crush food in advance
• B. Acid is being released from her stomach into her mouth
• C. Her brain reduces her hunger by producing acid
• D. More saliva is being released, preparing the mouth for digestion

Q17. A Class 7 teacher wants students to truly understand that saliva does chemical work in the mouth. Which classroom strategy would be MOST effective?

• A. Read out the line 'Saliva digests starch' from the textbook and ask students to memorise it
• B. Show a poster of the human digestive system and label all parts
• C. Ask each student to write 'Saliva breaks starch into sugar' five times
• D. Have students chew boiled rice for 30–60 seconds and notice the change in taste, then connect this to Activity 9.1's iodine test

Q18. The tongue plays two distinct roles during the journey of food from the mouth to the food pipe. Which of the following pairs of roles is most accurate?

• A. Producing saliva and chewing food
• B. Killing bacteria and absorbing nutrients
• C. Storing partially digested food and producing acid
• D. Mixing chewed food with saliva and pushing the softened food into the food pipe

Q19. Why is the churning movement of the stomach important even though digestive juices alone can break down food chemically?

• A. Churning produces heat that helps break the bonds in food
• B. Churning makes the stomach larger so more food fits in
• C. Churning produces the acid needed to digest protein
• D. Churning mixes food thoroughly with the digestive juice, acid and mucus for effective digestion

Q20. Consider the following statements about pancreatic juice: I. It is basic in nature. II. It helps neutralise acids present in the food coming from the stomach. III. It is secreted by the liver. Which statements are correct?

• A. I and III only
• B. II and III only
• C. I and II only
• D. All three

Q21. The 'large' intestine is shorter than the small intestine. Then why is it called the large intestine?

• A. Because it processes a larger amount of food than the small intestine
• B. Because it absorbs a larger volume of water than the small intestine
• C. Because it grows in size with age
• D. Because it is wider in diameter than the small intestine

Q22. Match the animal to its specialised digestive feature: (i) Cow — (P) Gizzard with grit (ii) Myna — (Q) Rumen and rumination (iii) Human — (R) Six-metre small intestine Which option pairs them correctly?

• A. (i)-Q, (ii)-P, (iii)-R
• B. (i)-R, (ii)-Q, (iii)-P
• C. (i)-Q, (ii)-R, (iii)-P
• D. (i)-P, (ii)-Q, (iii)-R

Q23. When we inhale a lot of dust-laden air, we often sneeze. Which of the following gives the BEST possible explanation?

• A. Air pressure inside the nose suddenly falls below outside pressure
• B. The diaphragm gets stuck in the downward position
• C. The lungs become temporarily empty of oxygen
• D. Dust irritates the inner lining of the nasal passages, and the body forces it out with a sudden burst of air

Q24. During exhalation, which of the following changes happens in the chest cavity?

• A. Ribs move up; diaphragm moves down; chest space increases
• B. Ribs move outward; diaphragm stays still; chest space stays the same
• C. Ribs do not move; diaphragm moves down; chest space increases
• D. Ribs move down and inward; diaphragm moves upward; chest space decreases and air is pushed out

Q25. A teacher wants to address the misconception that 'when we breathe in, we suck air in like a vacuum cleaner'. Which of the following is the BEST follow-up to Activity 9.2 (bottle–balloon model)?

• A. Tell students the misconception is wrong and move on
• B. Ask students to memorise the breathing mechanism word for word
• C. Show a video of a vacuum cleaner and let them compare it themselves
• D. Have students pull and release the rubber sheet, observe the balloons inflate and deflate, and link this to ribs and diaphragm changing chest volume — the body 'makes room' for air, not 'sucks' it

Q26. Rakshita sets up Activity 9.3. She passes inhaled (surrounding) air into lime water in tube A using a syringe, and exhales into lime water in tube B through a straw. To confirm that the milky colour in B is due to CO₂ and not the straw, the BEST follow-up step is to

• A. Wash the straw with hot water before re-doing the experiment
• B. Change the straw with a plastic pipe and repeat the experiment
• C. Hold her breath for some time and then repeat the activity
• D. Pass air rich in CO₂ (from a candle's flame) into a fresh tube of lime water and check if it also turns milky

Q27. Without respiration in our cells, which of the following would NOT happen?

• A. Carbon dioxide would be produced inside the body
• B. Sunlight would no longer fall on us
• C. Saliva would not be released in the mouth
• D. We would not get the usable energy we need to walk, run, play and think

Q28. Different animals show different breathing mechanisms. Match the animal with the main organ it uses: (i) Cow — (P) Gills (ii) Fish — (Q) Moist skin (iii) Earthworm — (R) Lungs Which option is correct?

• A. (i)-R, (ii)-P, (iii)-Q
• B. (i)-Q, (ii)-R, (iii)-P
• C. (i)-P, (ii)-R, (iii)-Q
• D. (i)-P, (ii)-Q, (iii)-R

Q29. The circulatory system in the human body includes which of the following three parts?

• A. Lungs, alveoli and windpipe
• B. Stomach, small intestine and large intestine
• C. Liver, pancreas and gall bladder
• D. Heart, blood and blood vessels

Q30. A Class 7 teacher draws the journey of food as: Food → Mouth → __1__ → Stomach → __2__ → __3__ → Anus. The BEST set of labels for blanks 1, 2 and 3 is

• A. Windpipe, large intestine, small intestine
• B. Stomach, small intestine, rectum
• C. Food pipe, large intestine, small intestine
• D. Food pipe (oesophagus), small intestine, large intestine