Tag: zoology

• Algal bloom: It is the rapid growth of algae in water due to which coloured scums are formed on the surface.
• Biomagnification: When a toxic substance gets incorporated in the food chain, its concentration gets increased at each successive trophic level. This is called biomagnification.
  
• Eutrophication: It is the phenomenon of nutrient enrichment of nitrogen and phosphorus in a water body that supports a dense growth of plants and animal life. Due to nutrient enrichment, excess growth of algae occurs which is called algal bloom. When these algae die, their organic matter gets decomposed and this results in the depletion of oxygen leading to death of aquatic animals. This process is called eutrophication. 

Snake is likely to show highest concentration of DDT once it has been introduced into the ecosystem.

If a lake is polluted with pesticides, large fish will contain the maximum amount of pesticide. The process due to which large fish will contain the maximum amount of pesticide is called biological magnification. It is also called as biomagnification. Phytoplanktons and zooplanktons absorb pesticide from the polluted water. Small fishes eats phytoplankton and zooplanktons. There will be increased accumulation of pesticide in their bodies. These small fishes are eaten by big fish. Hence, the big fish will have the maximum amount of pesticide.

• Biochemical oxygen demand (BOD) is a measure of how much organic pollution is in water. The BOD test measures the amount of dissolved oxygen in water that is used up due to the breakdown of organic pollutants, such as sewage, in a certain number of days. 
  
• Increased BOD means that a lot of oxygen is being used up, typically by bacteria breaking down organic material. 
  

Biomagnification is defined as the process by which a compound (such as a pollutant or pesticide) increases its concentration in the tissues of organisms as it moves up the trophic levels

The codons for the amino acid Arginine are CGU, CGC, CGA, CGG, AGA, and AGG. Option A lists three of these correctly.

Biomagnification is the process where the concentration of a toxic substance increases as it moves up the food chain. This occurs because the toxin is not easily degraded or excreted.

The accumulation of persistent chemicals like DDT in higher trophic levels is the definition of biomagnification. It is a major environmental concern for apex predators.

The biotic components of an ecosystem are arranged in several trophic levels which are interdependent on each other. The energy produced at one level is passed to another level. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well known for mercury and DDT. 

The different trophic level of an ecosystem interacts with each other and they are interdependent on each other. Biological magnification is a process where pollutants such as pesticides or heavy metals move up the food chain, passes into rivers or lakes and consumed by aquatic organisms such as fish, which in turn are eaten by large birds, animals or humans. It occurs when the concentration of a substance, such as DDT or mercury, in an organism, exceeds the background concentration of the substance in its diet.