The phenomenon that led to the discovery of penicillin involves
Biological antagonism
Genotype competition
Substrate competition
Struggle for existence
Typhoid fever could be confirmed by
Recently chikungunya and dengue cases were reported from various parts of the country. Choose the correct vector responsible for these diseases
Widal test is used for the diagnosis of
Haemoglobin of the human blood forms a stable complex compound with which of the following gas leading to death?