Question

What's the main role of bacteria? a) CO2 cycle b) nitrogen cycle c) phosphorus cycle. d)all

Answer 1

Explanation:

d) all is the correct answer

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Answer 2

Main role of bacteria  : (D) ALL

• A perfect nutrient cycle is one in which nutrients are replaced as fast as they are utilized.
• In contrast sedimentary cycles are considered relatively imperfect, as some nutrients are lost from the cycle and get locked into sediments and so become unavailable for immediate cycling.

Types of Nutrient Cycles. :

• Based on the replacement period, a nutrient cycle is reffered as a perfect or imperfect cycle.
• A perfect nutrient cycle is in which nutrients are replaced as fast they are utilised.

CO2 cycle :

• The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
•  Carbon dioxide in the atmosphere is taken up by the green plants and other photosynthetic organisms and is converted into organic molecules that travel through the food chain.
• Carbon atoms are then released as carbon dioxide when organisms respire.  

Nitrogen cycle :

• In nitrogen cycle, nitrogen circulates continuously through soil, water, air and living beings.
• All living beings need nitrogen.
• It is found in proteins and nucleic acid.
• Though 80% of air is nitrogen, yet most of the plants and animals cannot use it in gaseous state.

Phosphorus cycle :

• Sedimentary cycles are the ones in which the reservoir is the Earth's crust.
• Sedimentary cycles include those of phosphorus, sulphur, iron, calcium, and other more-earthbound elements.
• Due to rains and erosion phosphorus is washed away in the soil and water bodies.
• Plants and animals obtain this phosphorus through the soil and water and grow.