Parabens, as a group of microbial preservatives, are ineffective especially against
one of the following microorganisms :

Malignant Malaria is caused by

Skin cancer is also known as

Hormone secreted in root tip during the formation of nodule is 

Deficiency of folic acid leads to 

A convex lens of local length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is