24 December 2011

X Biology: Solved Questions: Management of natural Resourcess

CBSE Biology CLASS-Xth, Summetive assignments Chapter:  Management of natural Resourcess

Q1. Name a bacteria found in human intestine?

Ans: Coliform bacteria is found in human intestine.

Q2. Which is the easiest method to detect water pollution?


Ans : pH detection using the universal indicator.

Q3. A person lives near a forest. Enlist 4 items which he can get from forests to meet his daily needs.

Ans: food, fodder, fuel and medicinal plants.
Q4 .Why are forest called “biodiversity hot spot”?

Ans : forest are rich in most of the species of flora and fauna. All species of plants like  bryophyte, pteridophyta, ferns, gymnosperms, angiosperms and animal species from amoeba to man are found.

Q5.Name 4 substances that can be recycled.

Ans: glass, plastics, metals and paper.

Q6. What do you mean by the trm sustainable development?

Ans: Sustainable development means to meet the needs of present generation ,without  foreclosing the options of future generation, to keep balance between development and environment. 

Q7.How does mining lead to pollution?

Ans : Mining causes pollution because the large amount of slag is discarded for every ton  of metal extracted in the earth.

Q8. ”Coal and petroleum are converted forms of solar energy”.is this statement correct?

Ans :This is statement is correct because millions of years ago the raw material from  which coal and petroleum are derived were dead and decayed plants , which when were living photosynthesized by solar energy.

Q9 . Hydroelectric power is also an indirect form of solar energy. how?

Ans: Hydroelectric power is indirect form of energy, because the water which is stored in dams is rain water and rainfall occurs due to evaporation of water from water bodies due  to heat of the sun.

Q10 . Write at least two ways by which people of ancient India managed water resources?

Ans: a) kulhs in Himachal Pradesh   (b) khadins in Rajasthan.

Q11.What will happen if loss of biodiversity occurs?

Ans: when loss of biodiversity will occur ,it will lead to ecological crisis, the food chains  and food webs will get disturbed and resources will not be available for future  generations.

Q12.What strategies should be adopted such that forest products are used and the 
environment also  does not get disturbed?

Ans : Reforestation and afforestation to remake forests.

b) Not allowing monoculture of plants.

c) Employment of local people for maintenance of forests .

d) Killing of animals should be banned. Steps to create awareness among people to save the endangered flora and fauna should be taken.

Q13. Besides conservation of wildlife and forest, suggest some ways which can improve 
our environment.

Ans: a) Water  conservation , mainly fresh water.

b) Use of coal and petroleum should be done judiciously as its sources are limited.

c) Recyclable material such as paper, glass ,metals should be segregated from the trash. Biodegradable trash should be used for bio energy through fermentation and  anaerobic respiration to produce biogas. 

d) Oxides of sulphur and nitrogen should not be released into the atmosphere.

Q14.What is watershed management? what is its aim and what are the benefits?

Ans :watershed management is a scientific way of developing primary and secondary  sources of water .Its main aim is to develop primary sources of land and water and use  scientific methods to increase the biomass production as secondary sources so that no  ecological imbalance occurs. They  work on rejuvenating ancient and traditional way of  water storage along with mega- projects like dams and reservoir

Q15.  what you can do as an individual to reduce consumption of various nature 
resoources  and help in environment conservation?

Ans : a) follow 3 R’s(reduce, recycle, and reuse)

b) wastage of paper and water can be reduced .

ALL OLD BOOKS, MAGZINE CAN BE GIVEN FOR RECYCLING.

c) extra food  should be given to poor instead of throwing it.

d) Plastic, polythene, metal cans can be recycled

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