Tag: evs

Questions Related to evs

Wild buffalo is an endangered species because

evs earth - our home need to conserve biodiversity protecting our environment rules are for everyone

  1. Its population diminishing

  2. It has become extinct

  3. It is found exclusively in a particular area

  4. Its poaching is strictly prohibited

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Correct Option: A
Explanation:

An endangered species is a native species that faces a significant risk of extinction in the near future throughout all or a significant portion of its range.

Which among the following help in replacing the use of conventional energy?

evs earth - our home need to conserve biodiversity protecting our environment rules are for everyone

  1. Solar energy

  2. Coal

  3. $\displaystyle { KH } _{ 2 }{ PO } _{ 4 }$

  4. Petrol

Show answer
Correct Option: A
Explanation:

As the population is growing at the fast pace, it is very important to manage the use to conventional resources. Replacing or reducing the conventional natural resource by non-conventional resources shall help in benefiting the future generation.

Which of the following has to be observed to protect wildlife?

evs earth - our home need to conserve biodiversity protecting our environment rules are for everyone

  1. Prevent deforestation

  2. Place ban on poaching

  3. Place ban on visiting sanctuaries

  4. Both A and B

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Correct Option: D

Biogas is a result of ______

evs earth - our home need to conserve biodiversity protecting our environment rules are for everyone

  1. Anaerobic process

  2. Aerobic process

  3. Chemical agents

  4. Mechanical process

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Correct Option: A
Explanation:

Biogas constitutes 50-80% methane and rest carbon dioxide. Methane is produced by anaerobic degradation of organic matter. 

Which of the following is associated with evil quartet?

evs earth - our home need to conserve biodiversity protecting our environment rules are for everyone

  1. Three horsemen

  2. Hunters

  3. Four horsemen

  4. None of the above

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Correct Option: C
Explanation:
The evil quartet also known as four horsemen of the apocalypse explains the four main human-induced causes of extinction which were habitat degradation, fragmentation, the introduction of exotic species and over-harvesting. Thus, the correct answer is option B.

The size of the chest cavity increases during inhalation.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. True

  2. False

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Correct Option: A
Explanation:
  • When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
  • Hence the size of the chest cavity increases during inhalation is a true statement.
  • So, the correct answer is 'True'.

During heavy exercise the breathing rate of a person slows down.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

During exercise, the muscle cells need more oxygen to sustain their work This results in an increase in breathing and heart rate because both the lungs and the heart work extra to keep up with the ever growing need of oxygen.

Fermentation takes place in the muscle cells during exercise which results in an increase in the amount of lactic acid, hydrogen ion. This stimulates the respiratory system more and it results in an increase in the heart rate so that the heart pumps more blood. The blood pressure increase which leads to more blood flow in the alveoli.
The lungs absorb more oxygen and the muscle cells receive more blood and thus the oxygen demand is satisfied.
Therefore this statement is false.

Normal range of breathing rate per minute in an average adult person at rest is.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. $9-12$

  2. $15-18$

  3. $21-24$

  4. $30-33$

Show answer
Correct Option: B
Explanation:
  • Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.
  • The Normal range of breathing rate per minute in an average adult person at rest is 15-18.
  • So, the correct answer is '15-18'.

When there is a decrease in the concentration of oxygen in the blood, the rate of breathing

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Does not change

  2. Increases

  3. Decreases

  4. Increases or decreases depending on the density of blood

Show answer
Correct Option: B
Explanation:

Blood that is low in oxygen concentration and high in carbon dioxide. The rate of diffusion of a gas is proportional to its partial pressure within the total gas mixture. The lungs are never completely empty: There is always some air left in the lungs . At high altitudes, Patm decreases but concentration does not change. So, the correct option is "B" (Increases).

When $CO _{2}$ concentration in blood increases, breathing becomes.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. There is no effect on breathing

  2. Slow and deep

  3. Faster

  4. Shallower and slow

Show answer
Correct Option: B