Tag: evs

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Questions Related to evs

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

Which of the following activities is characterised by minimum breathing rate?

  1. Sleeping

  2. Washing of clothes

  3. Cleaning of floor

  4. Dancing
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
During sleeping, the body has the least activities to carry out, it does not require a high amount of oxygen. So it has minimum metabolism and hence minimum breathing rate.
So the correct answer is 'Sleeping'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Breathing rate can be measured by

  1. Heartbeat count

  2. Amount of blood

  3. Haemoglobin count

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The breathing rate can be measured by the heartbeat count. This is because the heart is connected to the lungs via the pulmonary artery. In a healthy person with the normal heartbeat, 60-100 per minute will have 12-20 breathes in a minute.
So the correct answer is 'Heartbeat count'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Breathing rate increases which of the following value?

  1. Pulse rate

  2. Metabolic rate

  3. Exhalation

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The breathing rate is no. of times a person breath in one minute. Breathing rate increases when there is high pulse rate and urgent requirement of oxygen in blood. due to which metabolic rate increases in the body. The exhalation also increases to pass out the carbon dioxide out of the body in high amount to increase oxygen concentration in the body.
So the correct answer is 'All of the above'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Which component of air is exhaled by the body?

  1. Nitrogen

  2. Oxygen

  3. Carbon dioxide

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

Carbon dioxide is a waste product of the body. It is majorly exhaled out by the body so that it will reduce the competition to gets bind to the haemoglobin with oxygen. It is saturated with water vapours.

So the correct answer is 'Carbon dioxide'.

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

During inhalation and exhalation which of the following is seen

  1. Ribs move up and outward, diaphragm moves down

  2. Ribs move down and inwards, diaphragm moves up

  3. Ribs move down and outwards, diaphragm moves down

  4. Ribs move up and inwards, diaphragm moves down
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
During inhalation, the external intercostal muscles contract and lifts ribs outward, while diaphragm become flat and moves down thereby increases the volume of thoracic cavity.
During exhalation, the external intercostal muscles return the diaphragm and ribs to their normal thoracic volume. Ribs moves down and inwards while diaphragm moves up.
So the correct answer is Both A and B'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Which component from the inhaled air is used by the body?

  1. Carbon dioxide

  2. Nitrogen

  3. Oxygen

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Inhalation (breath in) and exhalation (breath out) is a part of respiration. During inhalation oxygen is inhaled with air as major component which plays key role in metabolism.
So the correct answer is 'Oxygen'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Which of the following is considered to be a breath

  1. 2 inhalation + 2 exhalation

  2. 1 inhalation + 2 exhalation

  3. 2 inhalation + 1 exhalation

  4. 1 inhalation + 1 exhalation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The number of times a person breath is called breathing rate. A breath consists of one exhalation and one inhalation. Inhalation involves the breath in the air while exhalation involves the breath out the air.
So the correct answer is '1 inhalation + 1 exhalation'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

The breathing rate of an adult at exercise and rest respectively will be 

  1. 25 and 18 times per minute

  2. 18 and 25 times per minute

  3. 35 and 28 times per minute

  4. 28 and 35 times per minute
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Respiratory rate or breathing rate of a person increases with increasing physical activity. The normal breathing rate of an adult is 12-20 breathes per minute. But it is counted to be more than 20 breathes during exercise and less than 20 breathes at rest of the body.
So the correct answer is '25 and 18 times per minute'.
Multiple choice evs forests and life forest - the dwelling place of animals forest and its importance introduction to forests conservation of forest and wildlife wildlife

National Forest Policy of India has recommended (i) forest cover for the plains and (ii) for the hills.

  1. (i) 33% (ii) 67%

  2. (i) 67% (ii) 33%

  3. (i) 50% (ii) 50%

  4. (i) 40% (ii) 60%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

National Forest Policy (1988) of India has recommended 33 percent forest cover for the plains and 67 percent for the hills.

Multiple choice evs forests and life forest - the dwelling place of animals forest and its importance introduction to forests conservation of forest and wildlife wildlife

Study the following statements regarding food chains and select the correct ones.
(i) Removal of $80\%$ tigers from an area resulted in greatly increased growth of vegetation.
(ii) Removal of most of the carnivores resulted in an increased population of deers.
(iii) The length of food chains is generally limited to $3-4$ trophic levels due to energy loss.
(iv) The length of food chains may vary from $2$ to $8$ trophic levels.

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (i) and (iii)

  4. (iii) and (iv)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If carnivores, which feed on deer are removed, then the deer population will flourish. Removal of 80% of tigers from an area will cause an increase in the population of herbivores, which would further feed on more vegetation thus, decreasing its growth. The length of the food chain is limited to 3−4 trophic levels as only 10% of energy is transferred to the next trophic level. Hence after 3−4 trophic levels, there is very little or no energy left to sustain more trophic levels.

So, the correct answer is '(ii) and (iii)'.