Our environment

wastes that can be broken down by microorganisms in soil is called

A network of food chains is called a …………….

In a food chain the second trophic level is occupied by:

• Autotrophs

• Carnivorous

• Herbivores

• Producers

The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as:

• Biological accumulation

• Biological magnification

• Biological environment

• Chemical magnification

The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as:

• Biological magnification

• Chemical accumulation

• Biological accumulation

• Chemical magnification

Which one of the following pairs belong to the category of primary consumers?

• Eagle and snake

• Grasshoppers & cattle

• Snake and frog

• Water beetles & fish

Calculate the amount of energy available to snake in the given food chain if there is 6500 J of energy available to grass hopper.

Grass ----> grass hopper ---> frog -----> snake

• 6500 J

• 650 J

• 65 J

• 6.5 J

Waste from our homes and factories are dumped into rivers, lakes, and seas, causing ____.

• Air pollution
• Water pollution
• Land pollution
• Waste

What does the Ozone in the atmosphere do?

• causes the greenhouse effect

• causes acid rain

• protects the Earth from harmful infrared (IR) rays

• protects the Earth from harmful ultraviolet (UV) rays

The ozone damage caused by pollution is called... 

• duplication
• replication
• depletion
• deprivation