Question

Which one of the following statements is not valid for aerosols?
A. They have negative impact on agriculture land
B. They are harmful to human health
C. They alter rainfall and monsoon patterns
D. They cause increased agricultural productivity

Answer 1

Hint:An aerosol is a kind of suspension of very finer liquid solid particles in air or another gas. They can be classified as natural or anthropogenic. Fog, mist, dust, forest exudates and geyser steam are natural aerosols. Whereas particulate air pollutants and smoke are examples of anthropogenic aerosols.

Complete answer:
As we discussed already, an aerosol is referred to as a suspension system of liquid or solid particles in a gas. It includes both types of particles and the suspending gas, which is usually air. You should know, the primary aerosols have particles introduced directly into the gas whereas the secondary aerosols are formed by gas-to-particle conversion. There are various kinds of aerosol, divided according to physical form and the way they were generated. These include dust, fume, mist, smoke and fog.
Remember, because aerosol particles present in the atmosphere scatter as well as absorb incoming solar radiation therefore, they indirectly affect plant productivity by reducing incoming solar radiation.
It’s important to know that radiative effects of aerosols mainly on clouds act to suppress precipitation, as they decrease the amount of solar radiation that reaches the land surface. Therefore, cause less heat to be available for evaporating water and energizing convective rain clouds and ultimately can decrease rainfall.
Now let’s recap, Aerosol is defined as a colloid of fine solid particles in the air such as fog, and is a type of pollutant which hinders the sunlight to reach the plants and therefore, plants are not able to trap light for photosynthesis. Hence, in the absence of photosynthesis the agricultural productivity will be decreased.

Additional information:
Keep in mind, there are many aerosol sprays which have highly toxic chemicals like xylene and formaldehyde, they are the same chemical used for preserving anatomical specimens in jars.

So, our correct answer is option D.

Note:- Remember, aerosols are used in healthcare in the form of inhalers, disinfectant, anesthetic preparations, etc. Also, the household preparations in aerosol cans consists of air fresheners, car cosmetics, cleaning agents, varnishes and paints, etc and lastly, certain foodstuffs, like oil or whipped cream.