Question

Metanephridia of earthworms are:
A. Homologous to flame cells
B. Analogous to flame cells
C. Connected with respiration
D. Helpful in copulation

Answer 1

Hint: Metanephridium is a sort of excretory organ found in spineless creatures, for example, annelids, arthropod, and Mollusca. These ciliated tubules siphon water conveying surplus particles, metabolic waste, poisons from food, and pointless hormones or hormones that are not required out of the life form by guiding them down channel molded bodies called nephrostomes. This waste is dropped off by the creature at the nephridiopore.

Complete answer:
Planaria are flatworms that live in freshwater.
Their excretory framework comprises two tubules associated with a profoundly spread conduit framework
The cells in the tubules are called flame cells (or protonephridia) on the grounds that they have a bunch of cilia that resembles a glinting flame when seen under the magnifying instrument.
Then again, Earthworms (annelids) have somewhat more advanced excretory structures called nephridia.
A couple of nephridia is available on each fragment of the worm. They are like flame cells in that they have a tubule with cilia.
Thus, the right answer is 'analogous to flame cells'.

Hence, the correct answer is option B.

Note: A flame cell is a specific excretory cell found in the most straightforward 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. Packs of flame cells are called protonephridia.
A metanephridium ordinarily comprises of a ciliated channel opening into the body depression associated with a tube
This tube might be differently glandularis, collapsed or extended, and which normally opens to the life forms outside.