Question

Funnel-shaped, ciliated pits on the ventral side of the kidney of Frog
A. Ostia
B. Nephrostomes
C. Nephridiopores
D. Coelomostomes

Answer 1

Hint: The knowledge of morphology i.e., the study of the external features, and anatomy, i.e., the study of the internal structures of a Frog. The excretory system of the Frog as it consists of kidneys.

Complete answer:The Ostia are the small pores on the body of the sponges that take the water inside to the coelomic cavity of the sponges through their body wall. The nephrostomes are the funnel-shaped ciliated pits on the ventral side of the kidney of the frog. They are always oriented towards the coelomic region. They are a component of the metanephridium. They are covered from inside with cilia. The function of the nephrostomes is to collect the excretory matter or the metabolic wastes, un-necessary hormones, and water from the coelom and pour it into the renal vein. The nephridiopores are the part of the excretory organ of the annelids and flatworms, known as the nephridium. We should know that they are also used for reproduction as they help in the release of the gametes in the water. Nephridia are analogous to the nephrons or the uriniferous tubules of the human kidneys. Coelomostomes are the ciliated funnels on the body of the annelids. They are the openings for the coelom ducts.
Thus, the correct answer is option (B).

Note: In the study of the morphology and the anatomy of any organism, the body can be classified into two faces. These are known as the dorsal face and the ventral face. Usually, it is said that the dorsal face is the backside and the ventral face is the front side. However, this is wrong. We should note that the dorsal face is actually that side of the body of an organism which faces towards the sky when an organism is walking normally. On the contrary, we should know that the ventral face of any organism is that side which faces the ground when an organism is walking normally.