Environmental Science Questions and Answers Pdf - 3

Question: 11

What are sand dunes?

In Islands like Rameswaram the strong wind forms dunes in sand near the sea shore. They are called as sand dunes.

Question: 12

List out the climatic factors?

The climatic factors include temperature, humidity, rain, wind, light and snow fall.

Question: 13

Define pollution?

Pollution may be defined as an undesirable change in the physical, chemical or biological characteristics of our air, water and land that will harmfully affect human life.

Question: 14

Write the effects of forest fire?

Forest fire or manmade fire causes air pollution, acid rain and global warming.

It is a major threat to the environment and Bio-diversity.

Question: 15

What are the methods of vegetative reproduction in Riccia?

The two methods of vegetative reproduction in Riccia are

(1) Fragmentation

(2) Adventitious branches.