Earth worm excreta generally having . . . . . . . . % Ca.

Answer: Option D

The excreta of earthworms generally have 25% of calcium. It contains NKP, micronutrients, beneficial soil microbes also plant growth hormones and enzymes.
The excreta of the earthworm is known as vermicompost and is the product of the decomposition process using various species of worms.
Vermicompost contains water-soluble nutrients and is an excellent, nutrient-rich organic fertilizer and soil conditioner. It is used in gardening and sustainable, organic farming.