Asked/Added Questions From NCERT:

-Answered by priyanshu kumar On 10 November 2019:03:05:00 PM

 Ozone is the Earth’s natural process for all life forms. It shields our planet from the UV radiations, as these ultraviolet rays are harmful for all the living things. Therefore, any change in the size of this layer will automatically affect the life of people, plants and animals living on earth. 

-Answered by priyanshu kumar On 17 October 2019:08:36:11 AM

-Answered by priyanshu kumar On 12 October 2019:04:10:51 PM

-Answered by priyanshu kumar On 12 October 2019:04:12:42 PM

 water

-Answered by Nishant Verma On 09 October 2019:02:50:08 PM

 1%

-Answered by Himanshi Verma On 08 October 2019:11:40:16 AM

 Various levels or steps in a food chain in which transfer of food takes place from one organism to another are called trophic level.

-Answered by Himanshi Verma On 08 October 2019:11:37:13 AM

 Sun.

-Answered by Himanshi Verma On 08 October 2019:11:35:59 AM

 (i)            It causes contraction of blood vessels, makes the skin pale, leads to excessive secretion of adrenalin hormone in to blood stream which is responsible for high blood pressure.

(ii)          It causes muscles to contract leading to nervous breakdown, tension etc.,

-Answered by Nishant Verma On 03 September 2019:03:38:06 PM

 a) More heat waves

b) Expansion of desert area

c) Natural fires in forestlands

d) More evaporation of water from oceans and water bodies

e) Melting of ice caps in Arctic and Antarctica regions

f) More cloud formation in the atmosphere.

g) Shorter and warmer winters and longer and shorter summer.

h) Changes in pattern of rainfall i) Rise in sea level

j) Flooding and submergence of low lying coastal areas.

-Answered by Nishant Verma On 03 September 2019:03:33:52 PM

 Biological Oxygen Demand (BOD) is defined as the amount of DO required to aerobically decompose biodegradable organic matter over a period of 5 days at 20○C.

Chemical oxygen demand (COD) is commonly used to indirectly measure the amount of organic compounds in water.

Increase in BOD and COD values degrades the quality of water. It is harmful to aquatic organisms and causes toxic effects at various levels of food chain.

-Answered by Nishant Verma On 03 September 2019:03:33:00 PM

 Noise pollution is the disturbing or excessive noise that may harm the activity or balance of human or animal life. The source of most outdoor noise worldwide is mainly caused by machines and transportation systems, motor vehicles, aircraft, and trains.

-Answered by Nishant Verma On 03 September 2019:03:30:24 PM

 Chlorofluorocarbons (CFC) are responsible for ozone layer depletion.

-Answered by priyanshu kumar On 13 October 2019:09:57:58 AM

-Answered by priyanshu kumar On 13 October 2019:10:01:04 AM

-Answered by priyanshu kumar On 13 October 2019:10:01:15 AM

 RElationship betweem biotic and abiotic.

-Answered by priyanshu kumar On 13 October 2019:10:44:47 AM

 When any harmful chemicals like DDT, enters in a food chain the concentration increases gradually at each trophic level. This phenomenon is called Biological Magnification.

-Answered by priyanshu kumar On 13 October 2019:10:45:26 AM

  May, 22

-Answered by Nishant Verma On 29 August 2019:02:58:00 PM

 Madagascar.

-Answered by Nishant Verma On 29 August 2019:02:56:08 PM

Substances that are broken down by Biological processes are said to be biodegradable. 

-Answered by Akki chauhan On 28 August 2019:04:53:16 PM

 All green plants and blue-green algae can produce their own food using abiotic components (photosynthesis), hence called producers.

-Answered by Himanshi Verma On 27 August 2019:06:53:44 AM

 The concentration of harmful chemicals increases with every next tropic level in a food chain. This is called biological magnification.

-Answered by Himanshi Verma On 27 August 2019:06:45:31 AM

 Green plants are producers as they convert the simple in organic material (  carbon dioxide , water) into complex organic substances ( glucose, starch, sugar) in the presence of sunlight and chlorophyll.

-Answered by Khushi Chauhan On 26 August 2019:07:24:41 PM

-Answered by Rohit Rajput On 26 August 2019:07:57:17 PM

Some substances can be acted upon by the microorganisms and broken down into simpler substances. such substances are called biodegradable.

 While some substances are inert and cannot be acted upon by the microorganisms and do not break down into simple substance. such substances are called non- biodegradable.

-Answered by Himanshi Verma On 22 August 2019:05:53:31 PM