Tag: natural resources- air, water and land

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Questions Related to natural resources- air, water and land

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

What would happen, if all the oxygen present in the environment is converted to ozone?

  1. We will be protected more.

  2. It will become poisonous and kill living forms.

  3. Ozone is not stable, hence it will be toxic.

  4. It will help harmful sun radiations to reach earth and damage many life forms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ozone is a form of elemental oxygen. In its most stable form, elemental oxygen exists as diatomic molecules (O2). The molecules of ozone contain three oxygen atoms (O3) and are unstable with respect to O2. Ozone is a very reactive gas, and even at low concentrations it is irritating and toxic. It occurs naturally in small amounts in the Earth's upper atmosphere, and in the air of the lower atmosphere after a lightning storm. 

Ozone has been implicated to have an adverse effect on plant growth: "... ozone reduced total chlorophylls, carotenoid and carbohydrate concentration, and increased 1-aminocyclopropane-1-carboxylic acid (ACC) content and ethylene production. In treated plants, the ascorbate leaf pool was decreased, while lipid peroxidation and solute leakage were significantly higher than in ozone-free controls. 

Ozone, along with reactive forms of oxygen such as superoxide, singlet oxygen, hydrogen peroxide superoxide, singlet oxygen, hydrogen peroxide, and hypochlorite ions, is naturally produced by white blood cells and other biological systems (such as the roots of marigolds) as a means of destroying foreign bodies. 

Thus Option B is correct.

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

Biological importance of ozone layer is :

  1. ozone layer stops ultraviolet rays

  2. ozone layer reduces green house effect

  3. ozone layer reflects radio waves
  4. ozone layer controls $O _2/H _2$ radio in atmosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ozone is an allotropic form of oxygen. 

It is too reactive to remain for long in the atmosphere at sea level.
At a height of about 20 kilometres, it is forrmed from the atmospheric oxygen in the presence of sunlight.
This layer protects us from the excessive concentration of U.V radiation.

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

A considerable part of harmful ultraviolet radiation from the sun does not reach the surface of the earth. This is because high above the earth's atmosphere is a layer of_________

  1. Carbon dioxide

  2. Hydrogen

  3. Ozone

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The presence of the layer of ozone prevents the UV rays from reaching the surface of the earth.


The reactions that occur are shown below:
$O _{3}\overset{h\nu}{\rightarrow} O _{2} + [O]$
$2O _{3}\overset{h\nu}{\rightarrow} 3O _{2}$

Option C is correct.

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

Biological importance of ozone layer is:

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice biology natural resources- air, water and land soil - formation and profile soil-nature soil profile

The weathering of rocks is caused by 

  1. Wind, water and climate

  2. Only wind and clay

  3. Only wind and water

  4. Wind, water and gravel
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Weathering is the breakdown of rocks through multiple physical and chemical processes. Wind causes physical abrasion, water contributes through erosion and chemical reactions, and climate (temperature variations, freezing-thawing) creates stresses that fracture rocks over time.

Multiple choice economics how does production take place? natural resources- air, water and land land land,labour, capital and entrepreneur production mechanism

All primary occupations like agriculture, animal husbandry, poultry farming, fisheries, dairying, forestry, etc. are land oriented.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The following occupations which are land oriented,that is, they occur due to the presence of land, are as follows:
Agriculture: the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.
Animal husbandry: the science of breeding and caring for farm animals
Fisheries: a place where fish are reared for commercial purposes.
Dairying: the business of producing, storing, and distributing milk and its products
Forestry: the science or practice of planting, managing, and caring for forests.