Question

Flame cells and metagenesis are found respectively in
A. Taenia and Hydra
B. Ascaris and Starfish
C. Taenia and Obelia
D. Earthworm and Obelia

Answer 1

Hint: A flame cell is a particular excretory cell found in the easiest freshwater spineless creatures, including flatworms, rotifers, and nemerteans; these are the least complex creatures to have a devoted excretory framework. Flame cells work like a kidney, eliminating waste materials.

Complete answer: The flame cell is an uncommon excretory cell present in Taenia (tapeworms). The cilia of flame cells impel squander through a tubule shaped by a cylinder cell. Metagenesis is the rotation of ages among sexual and agamic generations. In Obelia, metagenesis is seen, where agamic polyploid age is found in shifts with the sexual medusoid stage. In this way, the right answer is 'Taenia and Obelia'.
-In earthworms, the excretory organ is nephridia.
-In starfish, there is no distinct excretory organ, ammonia is removed by diffusion.
-In Ascaris, the excretory system has an H-like appearance (renette cell).
Hence, the correct answer is option C.

Note: Groups of flame cells are called protonephridia. The flame cell possesses a nucleated cell body. The beating of these flagella takes after a flame, giving the cell its name. The cup is connected to a cylinder cell, whose internal surface is likewise covered in cilia, which helps to move fluid through the cylinder cell. The cylinder opens remotely through a nephropore, or, in the Trematoda, into an excretory bladder. The capacity of these cells is to control the osmotic weight of the worm and keep up its ionic parity. Microvilli in the cylinder cell might be utilized to reabsorb a few particles