Tag: zoology

Questions Related to zoology

Biological importance of ozone layer is:

zoology natural resources- air, water and land ozone - a case study stratospheric pollution ozone and its depletion

  1. it stops ultraviolet rays

  2. ozone layer reduces green house effect

  3. ozone layer reflects radio waves

  4. ozone layer controls $O _2/H _2$ ratio in atmosphere

Show answer
Correct Option: A
Explanation:

Ozone is $O _3$ present in stratosphere region of the atmosphere, which protects us by absorbing harmful Ultraviolet radiation released by the sun that causes a variety of health problems in humans, plants, and other animals which leads to the damage in ecosystems. Plants do not and grow in heavy ultraviolet radiation.

Hence option $A$ is correct.

Ozone layer of stratosphere requires protection from indiscriminate use of ____________ .

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. pesticides

  2. atomic explosions

  3. aerosols and high flying jet

  4. balloons

Show answer
Correct Option: C
Explanation:

Ozone layer of stratosphere require protection from indiscriminate use of aerosols and high flying jet because they produce gases which react with ozone layer and depletion of ozone occurs.

Which one of the following is mainly responsible for depletion of ozone layer?

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. Methane

  2. Carbon dioxide

  3. Water

  4. Chlorofluorocarbon

Show answer
Correct Option: D
Explanation:

Chlorofluorocarbon is responsible for the depletion of ozone layer.

UV radiation from sun causes a reaction that produces _____________ .

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. carbon oxide

  2. sulphur dioxide

  3. fluorides

  4. ozone

Show answer
Correct Option: D
Explanation:

UV radiation from the sun on reaction produces ozone.

The proposal to ban supersonic jet planes in
Russia is because
A) They travel with very high speed.
B) It is dangerous to travel in them.
C) Their exhaust gases react with ozone.

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. A & B

  2. B

  3. C

  4. A, B & C

Show answer
Correct Option: C
Explanation:

The proposal to ban supersonic jet planes in Russia is because of toxic gases which reacts with ozone layer and damage it.

Result of ozone hole is:

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. green house effect

  2. global warning

  3. acid rain

  4. UV rays reach the earth

Show answer
Correct Option: D
Explanation:
The depletion of ozone layer is due to the increase in emissions of chlorine and bromine-contained  compounds like CFC's, methyl chloroform and methyl bromide.
Emissions of green gases affects ozone by atmospheric interaction.
As a result, U.V. rays reach the earth's atmosphere and causes skin cancer, and damages living and non-living things.

Which of the following statement is wrong?

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. Ozone is not responsible for green house effect

  2. Ozone can oxidise sulphur dioxide present in the atmosphere to sulphur trioxide

  3. Ozone hole is thinning of ozone layer present in stratosphere

  4. Ozone is produced in upper stratosphere by the action of UV rays on oxygem

Show answer
Correct Option: A
Explanation:

Ozone is a greenhouse gas that absorbs and emits radiant energy within thermal infrared range. The increase in ozone in the troposphere because of surface pollution gases have increased the warming effect on the earth's surface and contributed to a greenhouse effect.

In the upper layers of atmosphere, ozone is formed ?

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. By action of electric discharge on oxygen molecules

  2. By action of ultraviolet rays on oxygen molecules

  3. By action of infrared rays on oxygen molecules

  4. Due to sudden drop of pressure

Show answer
Correct Option: B
Explanation:
  • In the upper layer of atmosphere, the Ultraviolet rays (UV rays) split the molecule of oxygen $(O _2)$ into its constituent 2 atoms.
  • Each of the atom then combine with another oxygen $(O _2)$ molecule which gives rise to Ozone$(O _3)$.
  • Hence option B is correct answer.

Assertion : Ozone is destroyed by CFCs in the upper stratosphere

Reason : Ozone holes increase the amount of UV radiation reaching the earth.

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. Assertion and reason are correct , but the reasons is not the explanation for the assertion

  2. Assertion is false, but the reason is correct

  3. Assertion and reason are incorrect, Assertion and reason are both correct

  4. And the reason is the correct explanation for the assertion

Show answer
Correct Option: A
Explanation:
The upper stratosphere consists of ozone $(O _3)$, which protect us from harmful ultraviolet (UV) radiations coming from the sun.
When CFC reacts with ozone it breaks the molecule of ozone resulting in ozone layer depletion.

A considerable part of the harmful $UV$ rays of the sum does not reach the surface of the earth. This is because high above the earth's atmosphere, there is a layer of___________.

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. $O _3$

  2. $CO _2$

  3. $SO _2$

  4. $NO$

Show answer
Correct Option: A
Explanation:

This is because of ozone layer.Ozone is a gas in the atmosphere that protects everything living on the Earth from harmful ultraviolet (UV) rays from the Sun.The ozone layer absorbs ultraviolet (UV) radiation from the sun, preventing most of it from reaching the earth's surface.