The scientist who discovered the structure of chlorophyll was: MCQ with Answer and Explanation

Explanation:
Earthworm (Pheretima) belongs to phylum Annelida, characterized by metameric segmentation (body divided into segments), a closed circulatory system, and setae for locomotion. Tapeworm is a platyhelminth (flatworm), roundworm is nematode (Ascaris), Planaria is a free-living platyhelminth. Annelids include polychaetes (Nereis), oligochaetes (earthworm), and hirudinea (leech).

Explanation:
Skeletal muscle, attached to bones, is striated and under conscious (voluntary) control. Smooth and cardiac muscles are involuntary. Skeletal muscles are responsible for locomotion and posture.

Explanation:
Nitrogen is an essential component of amino acids (proteins) and nitrogenous bases of nucleic acids (DNA, RNA). Phosphorus is in nucleic acids and ATP, potassium is an ion, calcium is structural. The nitrogen cycle makes atmospheric N₂ available to organisms through fixation.