{"id":28705,"date":"2021-07-08T15:43:47","date_gmt":"2021-07-08T10:13:47","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=28705"},"modified":"2022-03-02T10:30:14","modified_gmt":"2022-03-02T05:00:14","slug":"ncert-solutions-for-class-10-science-chapter-15","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-10-science-chapter-15\/","title":{"rendered":"NCERT Solutions for Class 10 Science Chapter 15 Our Environment"},"content":{"rendered":"

These NCERT Solutions for Class 10 Science<\/a> Chapter 15 Our Environment Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.<\/p>\n

Our Environment NCERT Solutions for Class 10 Science Chapter 15<\/h2>\n

Class 10 Science Chapter 15 Our Environment InText Questions and Answers<\/h3>\n

In-text Questions (Page 257)<\/span><\/p>\n

Question 1.
\nWhy are some substances biodegradable and some non-biodegradable?
\nAnswer:
\nSome substances are biodegradable because the enzymes released by the micro-organism helps in breaking down the biodegradable wastes but some are non-biodegradable because they can not be broken down by the micro-organism.<\/p>\n

Question 2.
\nGive any two ways in which biodegradable substances would affect the environment.
\nAnswer:<\/p>\n

    \n
  1. Biodegradable substances like food materials rancid after some time and produce bad smell and causes air pollution.<\/li>\n
  2. Biodegradable substances causes water pollution and make it unfit for domestic purposes.<\/li>\n<\/ol>\n

    Question 3.
    \nGive any two ways in which non-biodegradable substances would affect the environment.
    \nAnswer:<\/p>\n

      \n
    1. Non-biodegradable substances concentrated at different trophic levels and causes various health problems in human beings and animals.<\/li>\n
    2. Non-biodegradable substances do not break-down by organisms in the simpler substances so they disturb terrestrial and aquatic ecosystems.<\/li>\n<\/ol>\n

      In-text Questions (Page 261)<\/span><\/p>\n

      Question 1.
      \nWhat are the trophic levels? Give an example of a food chain and state the different trophic level.
      \nAnswer:
      \nThe various links or steps representing organisms in a food chain at which the transfer of food and energy takes place are called trophic levels.<\/p>\n

      For example in the following food chain.
      \nPlants \u2192 Deer \u2192 Lion<\/p>\n

      The plants constitute the first trophic level. Deer constitute the second trophic level and Lion constitute the third trophic level. Plants produce their food themselves in presence of sun light so they constitute first trophic level. Deer consume plants so it. constitute second trophic level. Lion consume deer so it constitute third trophic level.<\/p>\n

      Question 2.
      \nWhat is the role of decomposers in the ecosystem?
      \nAnswer:
      \nDecomposers consume, and thus decompose, the dead Demains of the other organisms i.e, autotrophs and heterotrophs. For example, certain bacteria and fungi break down the complex compounds present in the dead organisms into simpler-substances. Through the decomposers the elements enter the earth again, which are in turn again taken up by the plants. So, the cycle of exchange of matter continues. By their activity, the decomposers also maintain soil fertility.<\/p>\n

      \"NCERT<\/p>\n

      In-text Questions (Page 264)<\/span><\/p>\n

      Question 1.
      \nWhat is ozone and how does it affect any ecosystem?
      \nAnswer:
      \nOzone (O2<\/sub>) is a molecular gas formed by three atoms of oxygen. While O2<\/sub>, which we normally refer to as oxygen, is essential for all aerobic forms of life, ozone is a deadly poison. However at the higher levels of the atmosphere, ozone performs an essential functions, it shields the surface of the earth from ultraviolet radiation from the sun. This radiation is highly damaging to organisms, for example, it is known to cause skin cancer in human beings.<\/p>\n

      Is stratosphere ozone form a layer, known as ozone layer which protect us from harmful ‘UV’ rays of Sun. But due to some holes in the ozone layer ‘UV’ rays are reaching on earth and increasing its temperature. The increase in temperature of earth is causing global warming. So ozone can affect all ecosystems on earth.<\/p>\n

      Question 2.
      \nHow can you help in reducing the problem of waste disposal? Give any two methods.
      \nAnswer:
      \nWith the growing population, the generation of wastes is increasing day by day. Increased use of disposable items is also in favour of increasing waste. The problem of waste disposal can be reduced as follows :<\/p>\n