Question

The name given to the condition of testis in Ascaris is
A. Monorchid
B. Diarchic
C. Triorchic
D. Tetrarchic

Answer 1

Hint: Ascaris is a type of roundworm which belongs to the phylum Nematoda. It is a parasitic worm that causes ascariasis diseases in humans. They have only one testis.

Complete answer:
Nematodes are commonly known as roundworms. Roundworms are cylindrical in shape and tapering at the ends. Ascaris is an example of roundworm. Ascaris is commonly known as small intestine roundworms. The body of Ascaris is covered by a rigid covering called the cuticle and they shed off as they grow.

Ascaris consists of longitudinal muscles which are used to bend their bodies during locomotion. Ascaris are pseudocoelomates. It means they possess a body cavity between their mesoderm and endoderm layers. The body of Ascaris shows the presence of a complete digestive tract which involves two openings: the mouth and the anus.

The mode of reproduction in Ascaris is sexual reproduction and they have separate male and female Ascaris. The female Ascaris is longer than the male Ascaris. Ascaris possesses three embryonic layers of cells that are ectoderm, mesoderm, and endoderm which is absent in flatworms. The condition of monarchism is observed in Ascaris. The state of having only one testicle, within the scrotum is known as monarchism. The individual which exhibits monarchism is called monorchid. Therefore, monorchid is the condition of testis in Ascaris.

So, option A is the correct answer.

Note: Flatworms and roundworms are both different types of worms. Platyhelminthes are commonly known as flatworms. The method of reproduction of flatworm is simple as compared to the roundworms. Roundworms have two distinct male and female roundworms. Both flatworms and roundworms are harmful to human beings.