Explanation:

Tarballs are dark-coloured, sticky balls of oil that form when crude oil floats on the ocean surface. Tarballs are formed by weathering of crude oil in marine environments. They are transported from the open sea to the shores by sea currents and waves.

• Most of the times, the presence of several tarballs indicate an oil spill. However, its annual occurrence on the west coast during the monsoon has led marine biologists and experts to demand an investigation in the matter.

Oilzapper technology

• Developed by TERI after seven years of research work and partly supported by the DBT (Department of Biotechnology), Ministry of Science and Technology, Government of India, the Oilzapper is essentially a cocktail of five different bacterial strains that are immobilized and mixed with a carrier material (powdered corncob).

Hence only statement 1st is correct.