NURSING ANM AND GNM

NURSING EXAM QUESTIONS

TOXICOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Plastics
A
decompose readily in water
B
Decompose slowly, if at all, and persist for decades
C
Releases radioactive isotopes
D
Decompose in landfills to produce methane
Explanation: 

Detailed explanation-1: -While some plastics are reusable or recyclable, packaging and thicker plastic items are not. Plastic can take anywhere from 20 to 500 years to decompose, depending on the material’s structure and environmental factors such as sunlight exposure.

Detailed explanation-2: -The reason for the slow degradation is a simple one. These materials do not exist in nature, and therefore, there are no naturally occurring organisms that can break them down effectively or at all. The chemical bonds in plastic materials are not accessible or “familiar” to bacteria in nature.

Detailed explanation-3: -According to BBC Science Focus, biodegradable plastics take only three to six months to fully decompose, far quicker than traditional plastic that can take hundreds of years. It’s clearly a complex process, and one we are still ill equipped for.

Detailed explanation-4: -Normally, plastic items take up to 1000 years to decompose in landfills. But plastic bags we use in our everyday life take 10-20 years to decompose, while plastic bottles take 450 years.

There is 1 question to complete.