Tag: biology

Questions Related to biology

Few pollutants and their effects are listed below.
Mark the incorrect match.

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. Phosphate fertilizers in water - Eutrophication

  2. Hydrogen released in air - Global warming

  3. Sewage disposed in water - Increase in BOD level

  4. Carbon dioxide in air - Acid rain

Show answer
Correct Option: B
Explanation:

Global warming occurs when gases like carbon dioxide and other greenhouse gases in the atmosphere absorb sunlight and solar radiation. They trap the heat and increase the temperature on the earth's surface. 

The main reasons for deforestation are:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. rapid increase in the population of human beings and their livestock

  2. urbanization and human settlements

  3. cutting down of trees for obtaining fuel

  4. All of the above

Show answer
Correct Option: D
Explanation:

The main reasons for deforestation are-rapid increase in the population of human beings and their livestock, urbanization and human settlements, cutting down of trees for obtaining fuel.

The radiations from the sun is trapped by the earth's atmosphere. This effect is called :

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. green house effect

  2. nursery effect

  3. trapping effect

  4. None of the above

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Correct Option: A

Earth's greenhouse effect causes:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. warmer surface temperatures

  2. cooler surface temperature

  3. there is no change in surface temperature

  4. None of these

Show answer
Correct Option: A
Explanation:

Earth's greenhouse effect causes warmer surface temperature.

The average temperature of the earth's atmosphere is gradually increasing. This is due to:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. global warming

  2. global housing

  3. sun 

  4. none of the above

Show answer
Correct Option: A
Explanation:

The average temperature of the earth's atmosphere is gradually increasing. This is due to global warming.

Which protocol is agreement of global warming concern?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. Kroto

  2. Kyoto

  3. Kramer

  4. Krato

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Correct Option: B

What is the main source of global warming?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $SO _2$

  2. $CO _2$

  3. $H _2SO _4$

  4. $N _2O$

Show answer
Correct Option: B
Explanation:

The main source of global warming is carbon dioxide. It causes global warming by trapping heat.

When the soil of the greenhouse nurseries is sterilized with methyl bromide gas, it leads to a deficiency of:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. cellulose in roots

  2. chlorophyll in green leaves

  3. zinc in plants

  4. iron in red flowers

Show answer
Correct Option: C
Explanation:

Greenhouse nursery is a plant nursery where the plants are kept protected by several types of rodent and pest control product. Use of $MeBr$ gas leads to a deficiency of $Zn$ in plants as methyl bromide is very toxic.

Green house effect is mainly due to increase in the levels of:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $O _{2}$

  2. $CO$

  3. $CO _{2}$

  4. $N _{2}$

Show answer
Correct Option: C
Explanation:

A layer of carbon dioxide present in the atmosphere prevents the infrared radiations (reflected by the Earth's surface) from going out in the atmosphere. This heats up the Earth's surface and results in green house effect.

Melting of ice caps may be due to :


a) Depletion of ozone layer
b) Global warming
c) Acid rain

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. a & b

  2. b

  3. c & a

  4. c

Show answer
Correct Option: A