Which one of the following statements is not true?

(a) Concentration of DO below 6 ppm is good for the growth of fish

(b) Clean water would have a BOD value of less than 5 ppm

(c) Oxides of sulphur, nitrogen and carbon arc the most widespread air pollutant

(d) pH of drinking water should be between 5.5-9.5

Biosphere is

(1) In which individual interact to each other

(2) By which life originated

(3) The name of a bird

(4) Organic compound by which life diminishes

Which is not a renewable source

(1) sunlight

(2) Coal

(3) Water

(4) wind energy

Noosphere is synonyms of

(1) Environment

(2) Atmosphere

(3) Hydrosphere

(4) Stratosphere

When biosphere turns into human-dominated environment it is called

(1) Noosphere

(2) Troposphere

(3) Mesosphere

(4) Man sphere 

The living organisms on or around the earth constitute

(1) Biome

(2) Biosphere

(3) Community

(4) Biocoenosis

Biosphere refers to 

(1) Plants of the world

(2) Special plants

(3) Area occupied by living beings

(4) Plants of a particular area

What is the correct sequence of atmospheric layers starting from earth

(1) Stratosphere, troposphere, mesosphere, thermosphere

(2) Troposphere, stratosphere, mesosphere, thermosphere

(3) Mesosphere, troposphere, stratosphere, thermosphere

(4) Thermosphere, mesosphere, stratosphere, troposphere

A biosphere is composed of 

(1) Living organisms

(2) Living organisms + Lithosphere

(3) Living organisms + lithosphere + atmosphere

(4) Living organisms + lithosphere + atmosphere + Hydrosphere

Petroleum resource is

(1) Renewable

(2) Non-renewable

(3) Synthetic & biodegradable

(4) Infinite & unconventional