The World of Metals and Non-metals — Science STD 7 — Question

A spherical mirror is a part of:

Which scientist worked extensively on plant respiration?

Ammonia that turns red litmus blue is:

Loamy soil is most suitable for planting:

Choose the correct option: Water absorption through roots can be increased by keeping the plants.

It Is Advised Not To Hold The Thermometer By Its Bulb While Reading It;

"By providing clean water and sanitation to the poorest people on the planet, we can reduce poverty and suffering and ensure education for all children".
The above words are given by:

Lactic acid is found in:

Indigestion is caused by:

Sheela's teacher said in her classroom that we should not dispose of motor oils and medicines in the drain. Why did her teacher say this statement?