CBSE Questions for Class 10 Biology Sustainable Management Of Natural Resources Quiz 2 - MCQExams.com

• Reduce the consumption of various resources wherever possible. For example- we can reduce the consumption of electricity by switching off lights and other appliances when they are not required. 
• Recycle- There are many items that can be recycled again and again. Recycling is another way of reducing the demand for natural resources. For example- by recycling paper, we reduce the demand for wood and thus, help in saving the forest.
• Reuse- Many items can be reused, many times. For example, the old newspaper can be used for packing many items. We can use one side printed sheets for our rough work at home/work.
• Repurpose- This means when a product can no more be used for the original purpose, think carefully and use it for some other useful purpose. For example, cracked crockery, or cups with broken handles can be used to grow small plants and as feeding vessels for birds.
• Refuse- This means to say No to things people offer you that you don’t need. Refuse to buy products that can harm you and the environment, say no to single-use plastic carry bags.

• Large dams are built at a high cost and result in the submergence of large areas of natural forests, displacement of a large number of indigenous people and when built in the hilly area may also give rise to frequent earthquakes and landslides. 
• Thus, big dams have a high environmental, social and economic costs and all factors should be carefully studied before building a new dam. Also due to all these social, economic and environmental issues, large dams face opposition.

• Fossil fuel is the fuel derived from dead remains of plants and animals, which are buried underground for millions of years. For example - coal is obtained from the dead remains of plants while crude oil is obtained from the dead remains of animals. Kerosene is obtained by distillation of crude oil.
• Some other sources of energy which are not derived from dead remains of plants and animals (and are hence, not fossil fuels) are wind energy, solar energy, geothermal energy, tidal energy, etc.

$$\textbf{Correct option: }$$ C

$$\textbf{ Solution: }$$

$$\textbf{ Option (C): }$$

$$\bullet$$Deforestation is the deliberate action of clearing trees. 

$$\bullet$$The common cause of deforestation is unsustainable forest management, mining, agriculture, industrial development and increased fire incidence.

$$\bullet$$Loss of trees can lead to soil erosion which becomes the foremost reason for sudden climate change, reduced vegetation, desertification and the loss of biodiversity. 

$$\bullet$$The deforestation can also induce the increase in the greenhouse gases concentration in the atmosphere. 

$$\bullet$$This can result in the occurrence of barren land devoid of any vegetation. 

$$\bullet$$The less amount of vegetation can also reduce the percentage use of carbon dioxide from the atmosphere into photosynthesis. 

$$\bullet$$Therefore, the carbon dioxide ratio in the atmosphere increases simultaneously. 

Hence, the correct answer is option (C)

• Forests bring rainfall in the monsoon season. Trees absorb a lot of water from the soil for nourishment. Later, when the sun shines on the trees, water is released from the leaves and absorbed back into the atmosphere. 
• When the sun's energy removes water from the earth's surface the water collects into the clouds and when the clouds are heavy with water they release rain back to the earth. 
• Trees are like natural air conditioners and water pumps. They cool the earth by giving shade and recycling water. By cooling the air and ground around them, the shade from trees helps cool the earth's temperature overall. 
• Trees also help moderate the earth's rainfall, which also helps keep the temperature cooler.

• A conventional source of energy is a natural resource which cannot be produced, grown, generated or used on a scale which can sustain its consumption rate. Once depleted these is no more available for future needs. Also considered as non-renewable resources as these are consumed much faster than nature can create them. They can produce pollution when utilised.
• Non-conventional energy sources are those energy sources which are renewable such as solar energy, wind energy, ocean energy (tidal energy, wave energy, ocean thermal energy), geothermal energy, nuclear energy, etc. These when consumed usually do not generate air pollution but may cause soil and water pollution and are freely available in the nature.

• Petroleum is called liquid gold or black gold. It is so-called to imply its significance. 
• Petroleum has a high value in the market. It also serves directly or indirectly as a source for many organic products which are useful to humans.
  

• Forests form a very important part of the ecosystem. They play a major role in maintaining the ecosystem and climate. 
• Their roots hold the soil particles firmly together and protect them from erosion. 
• In return, the soil contains various nutrients that help the forests in maintaining the nutritive value for their plants. 
• They provide a habitat for a large scale of plants and animals living in them. They help in providing them with food, nutrition, and shelter. 
• Forests help in the formation of rain by giving out water vapor from their leave during transpiration which forms the cloud. 

• The main leader of the Chipko movement was Sunderlal Bahuguna. The idea of Chipko movement was of his wife and the action was taken by him.
• Chipko Movement, started in 1970's, was a non-violent movement aimed at protection and conservation of trees and forests from being destroyed. 
• So, the given statement is - 'False'.

• Some of the resources which are obtained from the Earth's crust like fossil fuels, minerals, metal ores are limited. 
• If the resources are continued to be exploited, soon these resources will be depleted and exhausted. 
• The use of these substances should be restricted only for important purposes. The substances can be replaced by other materials which are renewable. 
• The materials can be recycled in order to maintain the continuity of the resource.