Life Processes in Living Organisms — Science STD 9 — Question

Give the properties and uses of Sodium bicarbonate.

Write short note : plastic waste

Describe the transportation system in plants.

Give two uses of Blue vitriol.

1. Take two aluminium channels of different lengths.
2. Place the lower ends of the channels on the floor and hold their upper ends at the same height.
3. Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.

Questions
1. At the moment of releasing the balls, which energy do the balls have?
2. As the balls roll down which energy is converted into which other form of energy?
3. Why do the balls cover the same distance on rolling down?
4. What is the form of the eventual total energy of the balls?
5. Which law related to energy does the above activity demonstrate? Explain.

Which diseases are caused by artificial food colours?

:Take some water in a test tube and add a little red oxide (the primer used before painting iron articles) to it. Now add a small quantity of dilute HCl to it, shake the test tube and observe.(a) Does the red oxide dissolve in water?(b) What change takes place in the particles of red oxide on adding dilute HCl?

For work to be performed, energy must be ….

How do the digestive system and respiratory system work?