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Environmental Issues BIOLOGY - Environmental Issues

Maharashtra Board - STD 12 Science - BIOLOGY (MSBSHSE - English Medium). 655 questions in this chapter.

Question types

Environmental Issues question types

655 questions across 7 question groups — pick any mix to generate a BIOLOGY paper with step-by-step answer keys.

655
Questions
7
Question groups
5
Question types
Sample Questions

Environmental Issues questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
What is $\ce{BOD}$?
  • A
    The amount of $\ce{O_2}$ utilized by organisms in water.
  • ✓
    The amount of $\ce{O_2}$ utilized by microorganisms for decomposition.
  • C
    The total amount of $\ce{O_2}$ present in water.
  • D
    All of the above.

Answer: B.

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Q 2MCQ1 Mark
Air pollution is maximum by:
  • ✓
    Automobile exhausts and chemicals from industries.
  • B
    Sewage and pesticides
  • C
    Detergents and pesticides
  • D
    Sewage and effluents

Answer: A.

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Q 3MCQ1 Mark
The green scum seen in the fresh water bodies is:
  • ✓
    Both.
  • B
    Blue green algae.
  • C
    Green algae.
  • D
    None of these.

Answer: A.

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Q 4MCQ1 Mark
Greenhouse effect refers to:
  • A
    Cooling of Earth
  • B
    Trapping of $UV$ rays
  • C
    Production of cereals
  • ✓
    Warming of Earth

Answer: D.

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Q 5MCQ1 Mark
Which of the following is absent in polluted water?
  • A
    Hydrilla.
  • B
    Water hyacinth.
  • ✓
    Larva of stone fly.
  • D
    Blue$-$green algae.

Answer: C.

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Q 19Answer the following questions.2 Marks
DDT content in the water of a lake that supplies drinking water to the nearby villages, is found to be 0.003 ppm. The kingfishers of that area are reported to have 2 ppm of DDT. Why has the concentration increased in these birds? What harm will this cause to the bird population? Name the phenomenon.
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Q 23Answer the following questions in detail.3 Marks
Two types of aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilizers.
Answer the questions based on the facts given above:
  1. Name the organisms depicting the patterns A and B.
  2. State the reason for the growth pattern seen in A.
  3. Write the effects of the growth patterns seen above.
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Q 26Answer the following questions in detail.5 Marks
Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident’s Welfare Association of your locality organised an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate.
  1. How would you justify your arguments that promote burying and discourage burning? (Give two reasons)
  2. With the help of flow charts, one for each practice depict the chain of events that follow.
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Q 27Answer the following questions in detail.5 Marks
Since October 02, 2014 "Swachh Bharat Abhiyan" has been launched in our country.
  1. Write your views on this initiative giving justification.
  2. As a biologist name two problems that you may face while implementing the programme in your locality.
  3. Suggest two remedial methods to overcome these problems.
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Q 28Answer the following questions in detail.5 Marks
Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident’s Welfare Association of your locality organised an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate.
  1. How would you justify your arguments that promote burying and discourage burning? (Give two reasons)
  2. With the help of flow charts, one for each practice depict the chain of events that follow.
View full solution →
Q 29Answer the following questions in detail.5 Marks
Since October 02, 2014 "Swachh Bharat Abhiyan" has been launched in our country.
  1. Write your views on this initiative giving justification.
  2. As a biologist name two problems that you may face while implementing the programme in your locality.
  3. Suggest two remedial methods to overcome these problems.
View full solution →
Q 30Answer the following questions in detail.5 Marks
Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident’s Welfare Association of your locality organised an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate.
  1. How would you justify your arguments that promote burying and discourage burning? (Give two reasons)
  2. With the help of flow charts, one for each practice depict the chain of events that follow.
View full solution →
Q 32True-False1 Mark
There is a substantial fall in $NO_2$ and $CO_2$​​​​​​​ levels in the air in Delhi between $1997$ and $2005$.
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