Life Processes in Animals

Complete the journey of food through the alimentary canal by filling up the boxes with appropriate parts— Food → Mouth → Stomach → Anus

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.

What is the role of the diaphragm in breathing?

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

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?

Which of the following statements is correct and why? Anu: We inhale air. Shanu: We inhale oxygen. Tanu: We inhale air rich in oxygen.

We often sneeze when we inhale a lot of dust-laden air. What can be possible explanations for this?

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.

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. What do you think he wants to test?

Rakshita designed an experiment taking two clean test tubes, A and B and filled them with lime water. 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 the pipe. What do you think she is trying to investigate? How can she confirm her findings?

What are the good practices for maintaining oral hygiene? Try to gather information on the same from books/newspapers/conversation with elders. Prepare a report.

Find out different ways to maintain a healthy digestive system. Suggest some food items that help to maintain good digestive health. Make a report and present it in class.

Using coloured clay, prepare a 3-D model of the digestive system and label all parts of the digestive system using black paper strips.

What is air quality and AQI? Find out the effect of air quality on the respiratory systems of people working in various fields — farmers, factory workers, or street vendors.

Try to read about the box-breathing technique. What are its benefits?

Both birds and mammals have lungs for breathing, but birds can fly at high altitudes where oxygen levels are low. How might their respiratory system be adapted to help them survive in such conditions?