Free download NCERT Solutions for Class 10 Science Chapter 16 Management of natural resources in PDF form. Class 10 Science solutions for all chapters are also given in PDF. Download or view online, it is upon your choice.
NCERT Solutions for Class 10 Science Chapter 16
Class 10 Science – Management of Natural Resources
Important Questions with Answers for CBSE Exams – 2018
How our holy river Ganga is getting polluted? What is its ill effect? What is being done to prevent its pollution?
Ganga is getting polluted by releasing sewage and harmful chemicals and dumping of human corpses. The bathing, washing, also cause pollution. The industries contribute their chemical in the river Ganga.
Ill effect: The pollution makes water toxic which is very harmful for health Ganga Action Plan in 1986 is started to prevent pollution.
What are the tree R’s to save the environment?
The three R’s are: Reduce, Recycle and Reuse.
Reduce: This means that you use less. Save electricity by switching off unnecessary lights and fans. Save water by repairing leaking taps. No waste of food. Use less of your personal vehicle. Use a vehicle that gives more kilometres per litre of fuel. Use less of paper in office, school and home.
Recycle: This means that you collect plastic, paper, glass and metal items and recycle these materials to make required things instead of synthesizing fresh plastic, paper, glass or metal. For this the waste must be separated and what can be recycled should be separated from what cannot be. We have seen recycled paper of greeting cards in card shops. Even wedding invitation cards are now available on recycled paper used water can be recycled.
Reuse: this even better than recycling because it saves the energy which is spent at recycling a product. Things are used over and over again. For example, envelopes can be reused by reversing them. Plastic and glass bottles, in which packed items come, can be reused to store many materials in kitchen. We can reuse the water in which we have rinsed our cloths for cleaning the floss of the house. We can use one side printed paper to print on the reverse side. Old newspaper can be used for packing. Magazines and comic books can be given to other people who may find them useful.
What is biodiversity? What are biodiversity hot spots?
Biodiversity of an area is the number of species found there. However, the range of different life forms (bacteria, fungi, ferns, flowering plants, nematodes, insects, birds, reptiles and so on) is also important. The area/spot where a variety of wildlife and long range of different life form are found is called biodiversity hot spots. Forests are ‘biodiversity hot spot’ because of variety of wildlife and a long range of different life forms are found there. Other diversity hot spots, except forests are wetlands, coral reefs, etc.
What does “Chipko Movement” refers to? Write its two aims.
“Chipko Movement” or Chipko Andolan refers to ‘Hug the Trees Movement’ in which people clasp the tree to prevent felling the trees. This movement originated from a village called Reni Garhwal in Himalayas during the early 1970s.
(i) To stop felling of forest trees and to avoid destruction of them forever.
(ii) To get the forest products yet allowing a natural resource to replenish over time.
What are natural resources? State two factors that work against an equitable distribution of these resources?
The resources which are provided by nature to satisfy the needs and demands of humans beings are called natural resources.
Factors working against an equitable distribution of natural resources.
(i) Over exploitation of natural resources by some powerful people.
(ii) Improper management of these resources.
What are the advantages of storing water in the ground?
(i) Water does not evaporate when underground.
(ii) Water spreads to recharge wells.
(iii) It also provides moisture for the vegetation to survive during dry periods.
(iv) As the water is not exposed, it cannot become breeding ground for mosquitoes.
(v) Ground water is also protected from contamination by human and animals wastes.
What are fossil fuels? How are they important for us?
Fossil fuels are coal and petroleum. They are the important and major sources of energy. Petroleum is used for automobiles and electricity generation. Coal is a major source for electricity generation in thermal power plants. The energy from these sources is used for manufacture of large number of goods upon which our lives depend.
What harms has been caused to alpine meadows since nomadic shepherds have stopped grazing their cattle in such meadows?
The grasses become very tall which prevents the fresh growth of alpine grassland in Himalayas. This causes the end of Himalayas National Park.