Heat Transfer in Nature — Science STD 7 — Question

What is the cause of day and night on Earth?

Explain why forest should be conserved?

For a bulb to glow, it must be connected to a battery. Why?

What type of clothes should we wear in the summer?

Why is carbonic acid added to soft drinks?

Various organs constitute the respiratory system of human. These organs are located according to their functions. Identify them.

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

Mark the following statements as True or False. If false, write the correct statements. The large intestine is longer and wider than the small intestine of the human alimentary canal.

What is the function of bile secreted in the human body?

Classify the following as motion along a straight line, circular or oscillatory motion: Motion of your hands while running.