Pheretima posthuma are highly useful because:
Correct answer: B. They make the soil porous, leave their castings and take organic debris in the soil
- A. Their burrows make the soil loose
- B. They make the soil porous, leave their castings and take organic debris in the soil
- C. They are used as fish meal
- D. They kill the birds due to biomagnification of chlorinated hydrocarbons
Explanation
Pheretima Posthuma are highly useful and beneficial in agriculture. Their habit of burrowing and swallowing earth makes it porous and increases the soil fertility in many ways. Their burrows permit penetration of air and moisture in porous soil and their excretory wastes and other secretions also enrich soil by adding nitrogenous matters to the soil. Pheretima posthuma is not used as fish meal. Whereas a small white earthworm (Enchytraeus albidus) is often grown in soil and used to feed aquarium fish.
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Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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