Bihar Board Class 9Th English chapter 4 Too Many People, Too Few Tress Solutions | Bseb class 9Th Chapter 4 Too Many People, Too Few Tress Notes

Ans.— The global population has been rapidly going up during the last 3 centuries or so.

Ans.— When the population goes up pollution of rivers, lakes, air, drinking water and soil also goes up. The quality of life and its value continues to erode.

Ans.— 14 Americans die each day of asthma due to air pollution.

Ans.— These countries are China, Thailand and Egypt.

Ans.— The productivity and general health of the world’s Ans, forest is threatened can be gauged from the fact that the forests covered around 40% of the earth’s total land area earlier in this century. However by the end of this century the figure has been reduced to about 25%.

Ans.— The massive and on going deforestation hampers the ability of the biosphere to sustain life.

Ans.— Deforestation in Nepal is likely to affect India. As the trees of Nepal are cut down, its top soil is gradually being lost and its rains cause devastating floods in India and Bangladesh.

Ans.— Human populations have always been in flux because every day some people die while others are born. However, today with advances in nutrition, sanitation and health, people live longer and more of them reach reproductive age. Consequently, during the last three centuries or so, the global human population has been rapidly going up.

Ans.— By reproductive age, the writer means the age that is capable of duplicating human race through physical relations. with the opposite sexes. This age begins with puberty at the age of about 12-14. At this time there are biological change in the body of the individual making them capable of having physical relation with the opposite sex in order to give birth to e human baby.

Ans.— Human made pollution is the pollution spread through irresponsible behaviour of the human beings. It has badly affected America. According to an estimate about 60,000 Americans die each year of respiratory diseases which are caused by human made pollution. Our locality is also being affected by human made pollution. People throw waste materials everywhere at their will. There is also no proper drainage system. The situation is conducive to the spread of epidemics-both airborne and water-borne.

Ans.— Countries like Germany, Switzerland, China, Thailand and Egypt have managed to ‘reverse’ or slow down population growth. This has been possible because of several factors that include modernization, literacy, media campaigns, family planning and equal economic, educational and legal opportunities for women. Here ‘reverse’ means that instead of increasing the German and Swedish populations are actually declining.