Humus is essential for plant growth because

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(D) Humus is the dark-colored amorphous colloidal material that constitutes the organic component of soil.It is formed by the decomposition of plant a

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(D) Humus is the dark-colored amorphous colloidal material that constitutes the organic component of soil.It is formed by the decomposition of plant and animal remains and excrement,and it has a complex and variable chemical composition.Being a colloid,it can hold water,therefore it improves the water-retaining properties of the soil.It also enhances soil fertility,increases soil aeration,and improves soil porosity,which are all essential for healthy plant growth.

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