AP Class 10 Biology Chapter 9 Our Environment

The sum of biological and physical factors, along with the chemical interactions that affect an organism is known as the environment. All components of biosphere interact with each other in an organised manner. This organised interaction assures the survival of an organism that may result in the gradual evolution of the respective organism in the biosphere. Learn more about our Environment from AP Class 10 Biology Chapter 9 Our Environment.

Food Chain

In an ecosystem, the energy-rich food passes from producers to the consumers stepwise, with respect to their food relationships. A depiction of this is given below

AP Class 10 Biology Chapter 9 Our Environment

An example of the movement of food from organism to organism is

Grass → Grasshopper → Frog → Snake → Hawk

Ecological Pyramids

Apart from the food chains, pyramids, ecological pyramids are another type of representations, which show the flow of energy from one organism to another.

  • Pyramid of numbers depicts the population of organisms at each trophic level in a food chain.
  • Pyramid of biomass shows the availability of food as a source of energy at each trophic level in the food chain
  • Pyramid of energy represents the graphical model of energy flow in a community.

The depiction of all the pyramids listed above are given below

AP Class 10 Biology Chapter 9 Our Environment

Image 7.1 Pyramid of Numbers

AP Class 10 Biology Chapter 9 Our Environment

Image 7.2 Pyramid of Biomass

AP Class 10 Biology Chapter 9 Our Environment

Image 7.3 Pyramid of Energy

Steps Towards Prevention of Pesticides

The pesticides that we use to control pests have harmful effects on the ecology. It is impossible to completely prohibit the use of pesticides. A better solution would be to find effective methods of controlling pests which have far less harmful effects. Following are a few of the less harmful methods:

  • Crop Rotation
  • Biological control
  • Development of genetic resistant strains

1. What is biomagnification?

Solution: The tendency of pollutants to concentrate as they move from one trophic level to the next is known as Biomagnification.

2.  Write a short note on Minanamata disease.

Solution: Minamata disease was discovered in Minamata city in Kumamoto prefecture, Japan, in 1956 and was caused by the release of methyl mercury in the industrial wastewater from the Chisso corporation’s chemical factory. This highly toxic chemical bioaccumulated in shellfish and fish in Minimata Bay and the Shiranui Sea, which, when eaten by the local populace, resulted in mercury poisoning. While cat, dog, pig and humans deaths continued for 36 years.

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