Tag: land

Quizzes (5) Questions (182)

Questions Related to land

Multiple choice soil as a natural resource natural resources - air, water and land land physical resources biology

What is best pH of soil for cultivation?

  1. 3.4 - 5.4

  2. 4.5 - 5.5

  3. 5.5 - 6.5

  4. 6.5 - 7.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Soil nature is described in pH values. It can be alkaline, acidic or neutral. 
  • Highly acidic and highly saline soil often remains injurious for plant growth, microorganisms, etc. 
  • Soil pH strongly affects microbial activities. Neutral or slightly acidic soil (5.5-6.5) remains best for the growth of the majority of plants.

Therefore, the correct answer is option C.

Multiple choice water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

Which is a green house gas?
A) Methane 

B) Chlorofluorocarbons 
C) $CO _{2}$

  1. $A$ and $B$
  2. $B$ and $C$
  3. $C$ and $D$
  4. $A, B$ and $C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Greenhouse effect
* The progressive heating up of surface of the earth is earth is called green house effect or global warming.
 $CO _2$ and $H _2O$ block a part of the heat (IR) emitted by the earth & reflect back. Due to this earth surface gets heated up.
 50% in $CO _2$ content of air can increase the surface temperature of the earth by $3^oC$.
* In addition to $CO _2$ , the other green - house gases are CFCs (17%), $O _3$ (18%), NO (4%), water vapour (2%).

Multiple choice water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

Which of the following is not a sink for CO?

  1. Haemoglobin

  2. Microorganims present in the soil

  3. Oceans

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation


* Incomplete combustion of fossil fuels liberate CO into air. 80% of CO is released from automobiles.


* Permissible level of CO in air is 9 ppm. It reduces $O _2$ supply in human by forming a stable carboxyhaemoglobin.

$2C+O _2\rightarrow 2CO$
$2CH _4+3O _2\rightarrow 2CO+4H _2O$

* CO interacts with oxyhaemoglobin ($O _2Hb$) and forms carboxyhaemoglobin (CO-Hb) as :

$O _2Hb+CO\rightarrow COHb+O _2$

* CO has high affinity for haemoglobin than that of oxygen.

Therefore, option A is correct.

Multiple choice water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

The most problematic gases emitted in a volcanic eruption includes :

  1. sulphur dioxide

  2. carbon dioxide

  3. hydrogen fluoride

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Volcanic eruptions release a variety of gases, including sulfur dioxide, carbon dioxide, and hydrogen fluoride, all of which pose environmental and health risks.

Multiple choice water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

Forest fire produces ...... pollution.

  1. air

  2. water

  3. sea

  4. soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A forest fire is a natural source of air pollution. 


Several major air pollutants can be released when a fire is caused in the forest. 

For example, carbon monoxide even in small quantities can cause several damage to the plant and animal life. Higher levels of carbon monoxide content reduce the oxygen-carrying capacity of the blood and cause breathing problems.

Thus, the correct answer is option A. 

Multiple choice water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

Which one of the following is a  man-made source of air pollution?

  1. Volcanic-eruption

  2. Automobile-exhaust

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Anthropogenic or man-made source of pollution is automobile exhaust. When fuel burns various gases like carbon dioxide, oxides of nitrogen, sulfur dioxide, carbon monoxide are released into the air.