Plants convert
a. sunlight to chemical energy
b. chemical energy to mechanical energy
c. sunlight to mechanical energy
d. mechanical energy to chemical energy

option A

Explanation:

The correct answer is option A                                        

Plants convert sunlight into chemical energy.                      

Photosynthesis is a process that is used to convert sunlight into chemical energy using protons and electron from the water.                

Sunlight is used by the plants to convert the water and carbon dioxide into energy-rich sugar known as glucose.

explanation:

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.