Question

Which of the following is useful for us
A. Musca
B. Pheretima
C. Periplaneta
D. None of the above

Answer 1

Hint: The above mentioned names are the scientific names. To be precise, they are the genus of different organisms. Binomial nomenclature includes genus and species. There are many organisms, some which are very useful and do play an important role. In order to answer the above question, we need to learn the common name, scientific name and also how they are benefiting mankind.

Complete answer:
Let us have a keen look at them. The first mentioned organism is Musca which is the name given to a mosquito. Its binomial name is Musca domestica. We don't have much use with the mosquito right and the next option is Pheretima is the genus of earthworm. It is said to play an important role in breaking down the organic matter and also makes the soil porous and also increases nutrient availability in the soil. Coming to Periplaneta which is the genus of cockroach. The scientific name given to american cockroaches is Periplaneta americana. It is a gregarious pest causing huge damage in the households and hence it does not provide any use. So based on the above discussion we can conclude that the correct answer is earthworm i.e. Pheretima.

Hence the correct answer is option B.

Note:
Earthworm has many uses and is also called as Farmers friends as they benefit the farmers in many ways. It is also named as soil engineers. As they make their way into the soil,the soil gets loosen and helps in drainage and aeration. It also enriches the soil with its excreta and can also be used to prepare vermicompost and vermiwash that makes the soil more productive.