Tag: biology

Questions Related to biology

High amount of Escherichia coli in water is an indicator of

indicators of pollution biodiversity: conservation human influences on the environment option c: ecology and conservation biology

  1. Hardness of water

  2. Industrial pollution

  3. Sewage pollution

  4. Presence of chlorine in water

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Correct Option: C
Explanation:

Escherechia coli is present in the intestines and is released with the faecal matter. Their presence in the water is indicative of the sewage mixup in the water source.

A. Hardness of water is indicated by the mineral ions concentration.

B. Industrial pollution is indicated by the presence of heavy metals, toxins etc.

C. Escherechia coli presence indicates sewage pollution in water.

D. Chlorine is added for the treatment or purification of water.

Hence, the correct answer is 'Sewage Pollution'.

$CH _4 + 2O _2 \rightarrow CO _2 + 2H _2O$
The reaction is an example of :

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. burning

  2. respiration

  3. reduction

  4. all of the above

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Correct Option: A
Explanation:

The reaction is an example of burning of methane. 

Which process takes place inside the living system only?

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Burning

  2. Respiration

  3. Heating

  4. None of above

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Correct Option: B
Explanation:

Respiration is a process that utilizes oxygen to breakdown glucose and release energy in the form of heat and ATP. It is a slow process that occurs inside living system only. However, burning is a fast process that occurs outside a living system.

Respiration occurs at _____________ temperature and burning occurs at __________ temperature. 

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. high, high

  2. high, low

  3. low, high

  4. low, low

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Correct Option: C
Explanation:

Respiration occurs at low(body) temperature and burning occurs at high temperature. 

Oxidation of carbon and hydrogen present in carbon compounds and not food materials is an example of :

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. respiration

  2. burning

  3. physical change

  4. chemical change

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Correct Option: B,D
Explanation:

Oxidation of carbon and hydrogen present in carbon compounds and not food materials is an example of burning. 

Air surrounds earth as thick blanket called as __________.

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Ozone

  2. Layer

  3. Atmosphere

  4. All of the above

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Correct Option: C
Explanation:

Air surrounds earth as thick blanket called as atmosphere.

Air is a mixture of ___________.

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Compounds

  2. Elements

  3. Colorless gases

  4. None of the above

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Correct Option: C
Explanation:

Air is mixture of colorless gases.

Why is respiration considered an exothermic reaction ? Explain.

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. reduction of glucose takes place

  2. produces large amount of heat energy.

  3. oxidation of glucose takes place

  4. All of the above

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Correct Option: B,C
Explanation:

Energy is required to support life. Energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down into simpler substances such as glucose. Glucose combines with oxygen in the cells and provides energy. The special name of this combustion reaction is respiration. Since energy is released in the whole process, it is an exothermic process.
$\underset{Glucose}{C _6H _{12}O _6(aq)} + \underset{Oxygen}{6O _2(g)} \rightarrow \underset{Carbon dioxide}{6CO _2(g)} + \underset{Water}{6H _2O(l)} + Energy$

Which of the following are the uses of air?

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Generating electricity

  2. Disposal of seeds

  3. Flying of birds

  4. All of these

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Correct Option: D
Explanation:
Air is a mixture of different types of gases, dust particles, water vapours, etc.
The important components of air are nitrogen, oxygen, argon, carbon dioxide, etc,

Air is a very important component of the earth because of the following reasons:

  1. The windmill is designed to harness electricity from the wind, so it can be used for the generated electricity.
  2. Air helps in the process of pollination or seeds disposal.
  3. It helps the birds to fly.

Hence, the correct option is $\text{D}$

During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of:

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. evaporation

  2. osmosis

  3. diffusion

  4. plasmolysis

Show answer
Correct Option: C
Explanation:

Breathing involves the exchange of gases in the lungs, a process which occurs by diffusion. The oxygen is then transported throughout the body. Carbon dioxide is the waste gas produced by respiration.


Thus, option C is correct.