Physical and Chemical Changes — Science STD 7 — Question

Write short notes on reproduction in plants by vegetative propogation.

Explain respiration in yeast.

Why do plants die in summers, if they are not watered?

Can we contribute in sanitation at public places? Explain.

Priya observed that lime water turned milky on blowing through a straw. What did she conclude?

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.

Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.

Why concave mirror is called a converging mirror and a convex mirror is called a diverging mirror?

Why it hurts when someone pulls his hair but not when he goes for a haircut?

Explain why factory waste should be neutralised before disposing it into the water bodies.