Life Processes in Plants — Science STD 7 — Question

Sketch a diagram to show how plants maintain the balance between carbon dioxide and oxygen in the atmosphere?

What is the advantage of a distance time graph?

Use a torch and a ball in a dark room to show how only half of the Earth receives sunlight. Describe your observation and also draw the diagram.

It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain.

A car covers 60 km in the first hour, 70 km in the second hour, and 50 km in the third hour. Is the motion uniform? Justify your Answer :
Find the average speed of the car.

Draw a diagram to show the convection.

What is sexual reproduction? Explain with example.

You see two rocks, one breaks easily and one does not. How would you identify what causes the difference scientifically?

What role does villi performs in the small intestine?

What does the book mean by 'exploration is not just discovery'?