EASY
Earn 100

Name the acid present in the stomach of human body?

Important Questions on Biomolecules and Their Behaviour

EASY
Which of the following period is declared as the International Decade for action on Water for life by the General Assembly of United Nations?
EASY
What is the chemical name of the salt used in the kitchen?
HARD

Microbes such as bacteria and fungi can cause food to spoil. We can store dried grapes (raisins), but not the grapes.

Why is it possible to keep dried fruit for a long time than undried fruit?

EASY
Water is one of the basic constituents of all _____. (non-living things / living things)
HARD
Hydroelectric power plants are constructed to produce electricity. Why do environmentalists oppose the construction of such plants on dams?
MEDIUM
a. Purest form of water i Can be removed by boiling 
b Water Table ii Collection of water on surface of Earth
c Temporary hardness iii Is present on top layer of an aquifer
d Permanent hardness iv Rain water
e. Surface water v Chlorides of calcium and magnesium
MEDIUM
The area from which water drains into a river or stream is its _____ area. (water divide/ catchment)
MEDIUM

Dams are built to conserve water. Why do some environmentalists oppose the construction of dams?

EASY
When surface water bodies get polluted, people turn to _____ to meet their needs. (groundwater/ potable water)
EASY
Tanks are a very important source of water in _____ India. (Western / Southern)