Reproduction in Plants — Science STD 7 — Question

Explain chemical reaction along with examples.

Why does an athlete breathe faster and deeper than usual after finishing the race?

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electro magnet will attract more pins? Give reason.

What would happen if the mucus lining in the stomach were absent?

(i) Name the only artery that carries carbon dioxide rich blood.
(ii) Why is it called an artery if it does not carry oxygen-rich blood?

How can you identify vinegar, baking soda solution, and sugar solution using turmeric paper?

What are Milk teeth and permanent teeth?

What happens when an animal dies in the forest?

One day, Pinki was ironing the clothes in her room. After half an hour of ironing, the light went off and Pinki went outside to the lobby of her house to check if there was any problem in the household circuit. At the same time, she listened the voice of her 4 years old daughter from the same room where she was ironing the clothes. Her daughter was about to touch the hot electric iron but at the same moment, Pinki entered in the room and pushed her daughter back from that place.
(i) On which effect of electric current, does the electric iron work?
(ii) Mention the values showed by Pinki here.

Suppose you place a red transparent sheet on the torch. What will happen to the shadow of such object?