Question

Roundworms belong to the phyla
a) Nematoda
b) Porifera
c) Platyhelminthes
d) None of these

Answer 1

Hint The roundworms are mostly terrestrial but are also parasitic and also free living. They are also present in the aquatic conditions. They have an elongated and cylindrical body which is why they are named roundworms. They have an unsegmented body.

Complete answer: The roundworms belong to the phylum Nematoda. They are diverse in nature and are present in the parasitic or the free-living forms. They have an unsegmented round cylindrical and elongated body. They are bilaterally symmetrical in nature and have tapered ends on the both sides of the body. They are triploblastic in nature. Roundworms live in our small intestine as parasites. They can transmit through the infected stools and through the infected surfaces which are infected by the contaminated soil and dirt. Ascariasis is a disease that is commonly caused by the roundworms. If the roundworms reach the lungs then it causes coughing, blood mucus, and shortness of breath. When they reach the small intestine then they cause vomiting, irregular stools, loss of appetite, weight loss, and also discomfort and pain. The eggs of the roundworms get swallowed up by the transmission. They reach the small intestine and the larvae then move into the blood and reach the lungs. Either they are coughed out or they reach the intestine again and then lay eggs there. Thus, continuing their lifecycle.

So, the answer is ‘Nematoda’.

Note: The roundworms can be microscopic and can also grow that they are visible to the naked eyes. They have a complete digestive system and have bilateral symmetry present on them. They are mostly parasitic in nature but some of them are also free-living in nature.