91Ó°ÊÓ

Theassimilation of carbon is also known as carbon fixation. It is the procedure of transforming carbon dioxide into organic carbon compounds like glucose.

The process of the breakdown of organic components into simpler substances is known asdecomposition.

The process by which food particles are taken in by the protists via their cell membrane, producing a food vacuole is known asphagocytosis.

The symbiotic association between two organisms, in which one is benefitted, while the other is harmed is known asparasitism.

As carbon fixation comprises the transformation of inorganic carbon into an organic form, the process of phagocytosis, decomposition, and parasitism are not the illustrations of carbon fixation.

Thus, the optionsb, c, and d are incorrect.

The process of carbon fixation is witnessed within living organisms. One of the illustrations of carbon fixation is the process of photosynthesis. In this, inorganic carbon dioxide and water are converted into the organic form, that is, carbohydrates in the existence of chlorophyll and sunlight.

Hence, the correct answer isoption a.