Mosquito - repelling coils contain

One of the major difficulties in the biological control of insect pests is that

An earliest natural bioinsecticide of chinese origin is ________________.

Which insecticide is least hazardous to human health?

Which one of the following is used as biological insecticide?

If adolescents do not maintain cleanliness, they may catch ____________ infections.

Iron builds ___________ and iron-rich food such as leafy vegetables, jaggery, meat, citrus, Indian gooseberry (amla) are good for adolescents.

Fill in the blank:
___________ is a balanced food in itself.

State whether the given statement is True or False:
It is okay for adolescents to take drugs if prescribed by doctors.