Physical and Chemical Changes — Science STD 7 — Question

Why does the Sun appear to rise in the east and set in the west?

State uses of convex mirror.

Discuss the major cause of winds.

Define parasites.

Name one emotional change seen during adolescence.

What is a cell holder?

Pick the odd-one-out from each of the groups given below on the basis of respiratory organs. Give reason for your answer. Lizard, cow, earthworm, snake.

Fill in the blank with suitable word. The roots of a plant take up oxygen from the __________ trapped between the _________ particles.

Which gas present in air is essential for aerobic respiration? What is the role of this gas during respiration?

Following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describes each process. Removal of undigested and unabsorbed solid residues of food from the body.