List two most common STDs.

List some common STDs and their causative agents. How can these be prevented?

What are the two most common types of biofuels that are in use today?

Name two most common sources of food items?

List the most common microorganisms which are termed lactic acid bacteria (LAB). Write their three functions.

What are the two most common defects of vision (or defects of eye) ? How are they corrected ?

Choose the most common insect pollinator from the given list:

The incidences of STDs are high among persons in the age group of 15-24 years:- Name some common STDs (Any four).

Syphilis, Gonorrhea are the common STDs. Suggest any two method to prevent the infection of disease.