We should switch off bulbs and lights during day time. Give reasons.
When we imagine light as a ray, when a bulb is switched on light ray leaves it. However as we switch off it, there is no light ray is in the room. So does it mean that the bulb takes in all the light?
Why should we switch off the engine of vehicles while waiting at a traffic light?
All plants give out oxygen during the day and carbon dioxide during night do you agree with the statement give reasons. And also tell if leaves of a healthy potted plant were coated with Vaseline all the plant remain healthy for a long time give reasons