Bio-geo chemical cycles in nature - class-IX
Description: bio-geo chemical cycles in nature | |
Number of Questions: 29 | |
Created by: Amit Pandey | |
Tags: energy flow in an ecosystem zoology our environment: energy flow in the ecosystem mineral nutrition organisms and their environment air and atmosphere evs botany chemistry ecosystem : structure and function environment biology bio-geo chemical cycles in nature ecosystem environmental science magnificence of trees ecology and environment |
The wormicide character of _____ destroys worms in water.
The circulation of oxygen in various form through nature is called as
Which bacteria is responsible to fix nitrogen in leguminous plants?
The microbial biofertilizers which can act both symbiotically and non-symbiotically to increases soil fertility are
.......... oxygen is present in the atmosphere.
Free living nitrogen fixing biofertilizer is
Some of the nutrient cycles are labelled as below. Sulphur
cycle (A), phosphorus cycle (B), carbon cycle (C) and
nitrogen cycle (D)
Of these, the sedimentary cycle is represented by
Who discovered oxygen?
Burning of fossil fuels affects
The bacterium nitrobacter converts
Nitrogen fixing bacteria- anabaena - are found in the plant ______
The biological process by which carbon is returned to its reservoir is
Which one of the following is a wrong statement ?
The bacteria ______ supply natural manure to paddy fields.
True or False:
Burning of fossil fuels liberate oxygen.
Which gas is likely to be reduced in the atmosphere by deforestation?
The ozone at ground level is primarily from__________ precursors
Phosphorous, is needed for the
Which chemical was used as a foam blowing agents?
What is concentration of $O _{2}$ in atmosphere?
What does 'Aluminum' irritate?
In ocean, carbon is usually in form of:
Emission of $CO$ and $NO _{2}$ are responsible for higher concentration of $O _{3}$ in
What is natural sources of CO?
One molecule of CFCs contain 15000 molecules of
Proportion of CO consumption consists of basic components:
Carbon dioxide constitutes about 0.03% of the atmosphere
Phtotochemical phase does not includes ________________.
Chemical reactions triggered by ___________ transforms the organic material into hydrocarbons.