Reproduction in Plants — Science STD 7 — Question

What is sludge? Explain how it is treated.

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.

Why is the colour of blood is red?

Explain the formation and uses of battery.

What happens when you mix vinegar with baking soda? Explain the change.

How farming can also benefit from good water management.

Differentiate between a uniform and non-uniform motion.

State the effects of poor sanitation.

What makes the blood look red?

In Fig. a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?