Our Environment

1. Which of the following is biodegradable?

• Aluminium can

• DDT

• Polythene bag

• Cowdung

In the given food chain if the amount of energy at the fourth trophic level is 4 kJ, what will be the energy available at the producer level?

Grass → Grasshopper → Frog → Snake

• 4kJ

• 40kJ

• 400kJ

• 4000kJ

Those waste materials which can be broken down to non-poisonous substances in nature in due course of time by the action of micro-organisms are called …….. wastes.

In 1987 …….. succeeded in forging an agreement to freeze CFC production at 1986 levels.

Which of the two in the following sets belong to the same trophic level?

• Grass; Grasshopper

• Goat; Spider

• Hawk ; Rat

• Frog ; Lizard

In December 3, 1984 a vapour containing highly toxic cloud of methyl isocyanate (used in the production of insecticide carbaryl) burst from tall stacks of the union carbide pesticide plant and results in severe destruction. The incident took place in:

• Bhuj

• Hiroshima

• Bhopal

• London

The rate at which producers in an ecosystem capture and store chemical energy as biomass is called:

• Gross Primary Productivity

• Net Primary Productivity

• Net Secondary Productivity

• Gross Secondary Productivity

Green house gases are:

• Absorber of long wave radiation from earth

• Transparent to both solar radiation and long wave radiation from earth

• Absorber of solar radiations for warming the atmosphere

• Transparent to emission from cars for passage into outer space

When plants are eaten by primary consumers, a great deal of energy is lost as heat to the environment and some amount goes in carrying out various life process. State the average percentage of energy lost in this manner.

What is Bio-magnification or Bio-accumulation?