Our Environment

Sulphur dioxide affects

• Haemoglobin of blood

• Arteries

• Alveoli of lungs

• Nerves

Which of the following is not a functional component of an ecosystem?

• Communities

• Decomposers

• Sunlight

• Energy flow

Each step in a food chain is called a

• trophic level

• consumer level

• food web

• producer

An energy is passed from one trophic level to another,the amount of usable energy

• increases

• decreases

• remains the same

• energy is not passed from one trophic level to another

The last organism in a food chain is

• producer

• decomposers

• parasites

• none of the above

Replacing of plastic cups by paper cups for selling tea on train is prefered because

• paper cups are more aesthetic

• paper cups are more hygienic

• paper cups are cheaper

• paper cups are biodegradable and eco-friendly

Food web is the

• food that a spider collects using its web

• network of interlinked trophic levels

• network of interlinked food chains

• display of food items on a website

In a biosphere,which of the following is the ultimate source of energy

• Carbon

• Water

• Sunlight

• Nitrogen

A decrease in the grass population will most immediately affect decrease the available energy for the

• mouse

• snake

• hawk

• frog

The following graph shows the concentration of oxygen in a river,measured at stations 1-5 each 100 m apart.At which station will the concentration of organic matter be lowest?

• 1 & 5

• 2 & 3

• 3 & 4

• 4 & 5