Smoking is harmful as it produces polycyclic aromatic hydrocarbons that cause:

Smoking is supposed to cause which cancer ?

High concentration hydrocarbon pollutants in atmospheric air causes :

Along with nicotine, cigarette smokers receive tars, phenols, hydrocarbons, arsenic, and many other chemicals. Which of the following is not an effect of smoking tobacco?

Ultraviolet radiation from sun causes a reaction that produces:

The given diagram represents the relationships between organisms in a remote pond ecosystem. From this information. Which of the following is the most likely to be correct? 1) DDT present in the ecosystem would accumulate to the highest concentrations in the tissues of detritivore 1. 2) The introduction of consumer 4 individuals from an external population would lead a temporary increase in number of producer 2. 3) Disease in the producer 1 population would lead to an increase in the producer 3 population. 4) Extermination of consumer 3 would cause a sustained increase in the population of consumer 2.

In which way have microbes played a major role in controlling diseases caused by harmful bacteria ?

Alcohol addiction is harmful because it causes-

Which kind of power station produces sulphur dioxide causing air pollution and acid rain?

A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is

The chemical substances produced in our body and capable of destroying the disease causing micro-organisms are called as—