Fossil fuels- coal, petroleum and natural gas, are sources of energy and lots of useful substances. They have been and still they are the back bones of the economic developments and the basis of the modern civilization.
Salai tree or the Boswellia is the tree of economic and medicinal importance.
Plants and trees shed their leaves from time to time. This happens due to a number of reasons. From some plants and tree leaves continue falling throughout the year. At the same time new leaves continue developing to compensate their number.
ASSESSMENT: NCERT QUESTIONS WITH ANSWERS
The reflex action is an involuntary action which goes on automatically. We don’t have any control on this type of action. Walking, on the other hand is a voluntary action which can be controlled and modified by us.
I did not know about the Valentine’s Day or the Valentine’s Week even till I was married. I don’t know either when I knew about it.
Sankranti or Solstice means: moving from one place to the other or meeting with another. When sun enters from one rashi o the other rashi, it is called as Sankranti.
The Chief Justice of Jharkhand High Court Dr. Ravi Ranjan and Justice S.N.Prasad heard on the PIL demanding encroachment free conservation of Ranchi’s Bara Talab (so called Ranchi Lake) and other water sources on Thursday i.e. on 8th April, 2021.
man is causing serious impacts on environment. Concrete jungles do not allow rain water to enter into the gound. As such water table is falling down.
practices of modernization have disturbed the quality of environment.
Holi is an ancient Hindu festival which is also called as the Festival of Colours, love and spring.
Deepawali is the time of functions. This is the time when we meet with our friends and relatives. The atmosphere of love and recreation remains all around at this time. But we never think that we forget certain other important things at this time.
Ozone absorbs ultraviolet radiations so that much of it is never allowed to reach to the earth surface. The protective umbrella of ozone layer in the stratosphere protects the earth from harmful ultraviolet radiations. Ozone plays an important role in the biology and climatology on the earth’s environment. It filters out all the radiations that remain below 3000Å. Radiations below this wavelength are biologically harmful. Hence any depletion of ozone layer is sure to exert catastrophic impacts on life in the biosphere.
