Respiration in Organisms — Science STD 7 — Question

How does plant respire?

What happens to the food in small intestine of the digestive tract?

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Little Rishi (a student of class VI) was watching his favourite cartoon serial on television, while eating lunch. Suddenly he started getting hiccups. His elder brother Shubham, who was sitting near by him, gave him a glass of water and suggested not to eat too fast in a hurry. Little Rishi got confused as he had heard that 'hichki' comes when someone remembers.
He asked his father. His father smiled and explained him that it is only a myth. He also explained him the proper scientific reason behind it.
(i) What is hiccup?
(ii) Why do we get hiccup?

What are the different types of inorganic and organic impurities generally present in sewage?

What is ground water? What are the sources of water which are fed by ground water?

One day, Ramesh's friends were performing their respective experiments given by their teacher. While sitting in the practical lab instead of performing experiment, Ramesh was playing with his meter scale. All of the sudden, he held the scale in his hand and started moving in front of tubelight, then he observed the seven colours of white light. After sometimes, he got scolded by his lab teacher for not performing the experiment.
(i) Give the name of phenomenon that leads to the formation of band of seven colours.
(ii) Name the constituent colours of white light.
(iii) Mention the values shown by Ramesh here.

Make a table depicting the function of all the chambers of the human heart.

What are villi? What is their location and function?

Measure the breathing rate of the members of your family. Evaluate
(i) If the breathing rate of males is the same or different from that of females.
(ii) If the breathing rate changes with age.