RBSE Class 7 Science Chapter 9 Question Answer Life Processes in Animals

By tackling these RBSE Solutions Class 7 Science and RBSE Class 7 Science Chapter 9 Life Processes in Animals  Question Answer, students will build a solid foundation in the topic.

Life Processes in Animals Class 7 Question Answer

RBSE Class 7 Science Chapter 9 Life Processes in Animals Question Answer

Class 7 Science Curiosity Chapter 9 Question Answer (Exercise)

(Let Us Enhance Our Learning)

Question 1.
Complete the journey of food through the alimentary canal by filling up the boxes with appropriate parts

Answer:

Question 2.
Sahil placed some pieces of chapati in test tube A. Neha placed chewed chapati in test tube B, and Santushti took boiled and mashed potato in test tube C. All of them added a few drops of iodine solution to their test tubes-A, B and C, respectively. What would be their observations? Give reasons.
Answer:
1. Test tube ‘A’ (Pieces of chapati) → Blue- black appeared, because starch is present in chapati.

2. Test tube ‘B’ (Chewed chapati) → Light or no blue-black colour because amavlase (enzyme) present in saliva break down starch into sugar partially.

3. Test tube ‘C’ (Boiled potato) → Blue-black appeared because potato have adequate quantity’ of starch which reacts with iodine.

Question 3.
What is the role of diaphragm in breathing?
(i) To filter the air
(ii) To produce sound
(iii) To help in inhalation and exhalation
(iv) To absorb oxygen
Answer:
(iii) Diaphragm helps to contract and expand lungs. When diaphragm shrinks down, air enters the lungs and when it rises up then air exits from lungs.

Question 4.
Match the following.

Name of the part	Functions
(i) Nostrils	(a) fresh air from outside enters
(ii) Nasal passages	(b) exchange of gases occurs
(iii) Wind pipe	(c) protects lungs
(iv) Alveoli	(d) tiny hair and mucus help to trap dust and dirt from the air we breathe
(v) Ribcage	(e) air reaches our lungsthrough this part

Answer:

Name of the part	Functions
(i) Nostrils	(d) tiny hair and mucus help to trap dust and dirt from the air we breathe
(ii) Nasal passages	(a) fresh air from outside enters
(iii) Wind pipe	(e) air reaches our lungsthrough this part
(iv) Alveoli	(b) exchange of gases occurs
(v) Ribcage	(c) protects lungs

Question 5.
Anil claims to his friend Sanvi that respiration and breathing are the same process. What question(s) can Sanvi ask him to make him understand that he is not correct?
Answer:
Sanvi can ask that if respiration and breathing are the same process then why we can’t get energy by breathing. It clears that breathing is a process of entry-exit of air, whereas respiration is a chemical process in which energy is released from food.

Question 6.
Which of the following statements is- correct and why?
Anu : We inhale air
Shanu : We inhale oxygen
Tanu : We inhale air rich in oxygen
Answer:
Correct statement is : Tanu’s statement → We inhale air rich in oxygen.

Reason : Because the air yve take in is a mixture of gases in which 78% nitrogen. 21 % oxygen and other. It means we docs not take only oxygen even air which is oxygen-rich.

Question 7.
We often sneeze when we inhale a lot of dust-laden air. What can be possible explanations for this?
Answer:
Dust particle traps in mucus and hairs which excited respiratory system to bring them out and leads to sneeze; sneezing is a protective process which throws out dust and other harmful substances.

Question 8.
Paridhi and Anusha of Grade 7 started running for their morning workout. After they completed their running, they counted their breaths per minute. Anusha was breathing faster than Paridhi. Provide at least two possible explanations for why Anusha was breathing faster than Paridhi.
Answer:
Physical capacity of Anusha might be less than Paridhi so she needed more oxygen. May be Anusha ran more fast than Paridhi and needed more energy which leads to increase in respiratory rate.

Question 9.
Yadu conducted an experiment to test his idea. He took two test tubes A and B, and added a pinch of rice flour to the test tubes, half filled with water and stirred them properly. To test tube B, he added a few drops of saliva. He left the two test-tubes for 35-45 min. After that he added iodine solution into both the test tubes. Experimental results are as shown in Fig 9.15. What do you think he wants to test?

Answer:
Yadu wants to test that saliva converts starch present in food by breaking down into sugar. Test tube A (which don’t have saliva) → Blue- black colour appeared which indicates presence of iodine. Test tube B (which have saliva) → No blue-black colour or light colour appeared because the salivary amylase converts starch into sugar.

Question 10.
Rakshita designed an experiment taking two clean test tubes, A and B and filled them with lime water as shown in the figure. In test tube A, the surrounding air that we inhale was passed on by sucking air from the pipe, and in test tube B, the exhaled air was blown through pipe (Fig. 9.16). What do you think she is trying to investigate? How can she confirm her findings?

Answer:
Rakshita wants to test that exhaled air have more CO₂ compared to inhaled air.
1. Results of experiment: Test tube A (Inhaled air) → Lime water would not show any changes. Test tube B (Exhaled air): → Lime water turned milky.

2. Confirmation of findings : Lime water turned milky, it shows that CO₂ is present. Comparison of exhaled and inhaled air tells that the air we exhale have more CO₂ quantity.

Life Processes in Animals Class 7 Questions and Answers (Intext)

(Page No. 127 – 128)

Question 1.
I have seen cows keep chewing the food even when they are not actively grazing or eating anything. Why?
Answer:
This process is known as rumination. Grasseating animals partially chew grass and swallow it into their stomach, partial digestion of food takes place. The partially digested food is brought back to the mouth for gradual chewing. These animals are ruminants. The throughly chewed food again passes down the alimentary canal for further digestion.