Environment Science-10

Which one of the following is a decomposer?

• Earthworm

• Snail

• Bacteria

• Leech

What percent of Land in Nepal is occupied by Lakes?

• 1.6

• 0.2

• 0.7

• 0.6

In which one the following is a lotic ecosystem is found?

• Lake

• Pond

• Lake and pond

• Stream

Which one of the following is a producer?

• Hydrilla

• Birds

• Fishes

• Mollusks

Which one of the following is a radio active element?

• Copper

• Iron

• Lead

• Radium

Which one of the following is a green house gas?

• Oxygen

• Nitrous Oxide

• Nitrogen

• Argon

Which one of the following heavy metal is hazardous to our health?

• Aluminium

• Silver

• Gold

• Lead

When was United Nations Environment Programme (UNEP ) established?

• 1970

• 1972

• 1922

• 1982

In which layer of atmosphere is Ozone layer found?

• Troposphere

• Mesosphere

• Thermosphere

• Stratosphere

Which of the following green house gas is produced by ruminant animals during chewing cud?

• CH₄

• N₂O

• CO₂

• CFCs