In order to make Nitorgen available for primary producers like plants in ecosystems it is converted to?

A. Nitrates
B. Nitrites
C. Ammonia
D. Nitric Acid

What is the percentage of water in our brain?

A. 73%
B. 85%
C. 95%
D. 93%

What is the life span of red blood cells?

A. 110 days
B. 120 days
C. 140 days
D. 170 days

Enzymes are basically made up of?

A. Fats
B. Nucleic Acids
C. Vitamins
D. Protiens

What is the speed of sound in air?

A. 1347km/h
B. 1235km/h
C. 1290km/h
D. 1495km/h

The United Nations Conference on Environment and Development knew as RIO Summit was held in?

A. 1990
B. 1991
C. 1992
D. 1993

A camera uses Convex lens to form an image which is?

A. Real, Inverted, Magnified
B. Real, Inverted, Diminished
C. Virtual, Inverted, Magnified
D. Real, Upright, Diminished

Paris climate agreement was adopted in?

A. 2014
B. 2015
C. 2016
D. 2017

Inflammation of liver is caused by?

A. Cholera
B. Hepatitis
C. Tyohoid
D. Jaundice

Iron and Steel structure are damages by?

A. Carbon Monoxide
B. Sulphur Dioxide
C. Carbon Dioxide
D. Methane