Tag: evs

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Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Direct respiration occurs in.

  1. Human beings

  2. Prawn

  3. Insects

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

Insects respire via a tracheal system, which is a network of air tubes that brings oxygen directly to the body cells without the need for blood transport, known as direct respiration. Human beings, prawn, and fish rely on indirect respiration via blood and specialized respiratory organs.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Which is not function of 'conductiing part' of respiratory system?

  1. Clears the air from foreign particles

  2. Humidifies the air

  3. Brings the air to body temperature

  4. It is site for diffusion of oxygen and carbon dioxide

  5. Transports air to alveoli
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The conducting part of the respiratory system includes the nose, pharynx, larynx, trachea, bronchi, and bronchioles. Its primary functions are to transport, filter, warm, and humidify the air. The alveoli are the specific site for gas exchange, which is part of the respiratory zone, not the conducting zone.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Choose the correct statements with regard to human respiration:
(a) Inspiration is faciliated by contraction of phrenic and internal intercostal muscles
(b) Healthy human can inhale or exhale about $2000-3000$ml of air/min
(c) Functional residual capacity represents the volume of left out air in lungs after expiration
(d) Total lung capacity is the total volume of air that would be accomodated in the lunds after forced inspiration.

  1. a, c

  2. b, d

  3. c, d

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

Statement (c) is correct as functional residual capacity is the volume of air remaining in the lungs after a normal expiration. Statement (d) is correct as total lung capacity is the maximum volume of air the lungs can hold after a forced inspiration. Statement (a) is incorrect because inspiration is primarily facilitated by the diaphragm and external intercostal muscles, not internal ones. Statement (b) is incorrect because a healthy human typically breathes about 6000-8000 ml of air per minute.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Respiratory quotient for three different substrates was calculated and tubulated as shown here.

Substrate R.Q.
XYZ 0.911.3

Identify X, Y and Z and select the correct option regarding them.

  1. X - Protein, Y - Fats, Z - Glucose

  2. X - Glucose, Y - Protein, Z - Organic acid

  3. X - Protein, Y - Glucose, Z - Organic acid

  4. X - Organic acid, Y - Protein, Z - Fats
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiratory quotient if the protein is 0.8-0.9

For glucose- 1
For  organic acids -1.3
So, the correct option is 'X - Protein, Y - glucose, Z - organic acids'.

Multiple choice data handling analysis analysis of frequency distributions frequency table evs analysing data collection of data and presentation of data

Satish got the following marks in his weekly class tests out of $50$:
$48$, $32$, $36$, $42$, $38$, $35$, $39$, $49$, $34$, $14$, $32$, $37$, $31$ What should he expect in the next weekly test out of the following?
(i) between $40 - 50$
(ii) between $30 - 40$

  1. Between $40-50$
  2. Between $30-40$

  3. Data insufficient

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

Most of the marks provided fall within the 30-40 range (32, 36, 38, 35, 39, 34, 32, 37, 31). Therefore, it is statistically most probable that the next test score will fall in this range.

Multiple choice data handling analysis analysis of frequency distributions frequency table evs analysing data collection of data and presentation of data
 12  24  36  48  60  72
 24  48  60  72  50  30
 50  45  50  75  50  34

The number of students in a quiz competition scores are in the table. How many students scored $50$ marks?

  1. $4$
  2. $5$
  3. $8$
  4. $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
 Scores  Frequency
 12  1
 24  2
 30  1
 34  1
 36  1
 45  1
 48  2
 50  4
 60  2
 72  2
 75  1

So, there are $4$ students scored $50$ marks.

Multiple choice data handling analysis analysis of frequency distributions frequency table evs analysing data collection of data and presentation of data

Consider the following frequency distribution:

Class $0-10$ $0-20$ $0-30$ $0-40$ $0-50$
Frequency $3$ $8$ $14$ $20$ $25$

What is the above frequency distribution known as?

  1. Cumulative distribution in more than type

  2. Cumulative distribution in less than type

  3. Continuous frequency distribution

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

The given table lists the upper limits of the classes alongside the accumulated frequencies up to that point, which defines a less than type cumulative frequency distribution. More than type distributions use lower limits with frequencies accumulated downward.

Multiple choice data handling analysis analysis of frequency distributions frequency table evs analysing data collection of data and presentation of data

Consider the following statements :
1. A continuous random variable can take all values in an interval.
2. A random variable which takes a finite number of values is necessarily discrete.
3. Construction of a frequency distribution is based on data which are discrete.
Which of the above statements are correct ?

  1. 1 and 2 only

  2. 2 and 3 only

  3. 1 and 3 only

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

Statement 1 is correct (continuous variables take intervals). Statement 2 is correct (finite values imply discrete). Statement 3 is incorrect because frequency distributions can be constructed for continuous data as well.

Multiple choice data handling analysis analysis of frequency distributions frequency table evs analysing data collection of data and presentation of data

The marks (out of 10) obtained by 28 students in a Mathematics test are listed as below :
8, 1, 2, 6, 5, 5, 5, 0, 1, 9, 7, 8, 0, 5, 8, 3, 0, 8, 10, 10, 3, 4, 8, 7, 8, 9, 2, 0
The number of students who obtained marks more than or equal to 5 is

  1. 13

  2. 15

  3. 16

  4. 17
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Arranging the given marks in ascending order we get,

$0,0,0,0,1,1,2,2,3,3,4,5,5,5,5,6,7,7,8,8,8,8,8,8,9,9,10,10$
Students who obtained marks more than or equal $5$ are,
$5,5,5,5,6,7,7,8,8,8,8,8,8,9,9,10,10$
$\therefore$  Number of students who obtained marks more or equal to $5$ $=17$

Multiple choice data handling analysis analysis of frequency distributions frequency table evs analysing data collection of data and presentation of data

The frequency distribution of marks obtained by $60$ students of a class is given.

X $30-34$ $40-44$ $45-49$ $50-54$ $55-59$ $60-64$
f $3$ $5$ $12$ $18$ $14$ $62$


Find mode of the distribution.

  1. $42.50$
  2. $52.50$
  3. $52.05$
  4. $42.05$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The given class intervals should be converted into class boundaries. Since the distribution is regular, the modal class, by inspection, is $49.5-54.5$
Further, $L _m=49.5, f _m=18, f _1=12, f _2=12, h=5$
Mode, $Z=49.5+\displaystyle\frac{18-12}{(2\times 18)-12-14}\times 5=52.5$