Environment

With the ever increasing population of the world demand of people is also increasing. This note provides us an information on the environment and environmental pollution.

Summary

With the ever increasing population of the world demand of people is also increasing. This note provides us an information on the environment and environmental pollution.

Things to Remember

  • With the ever increasing population of the world demand of people is also increasing.
  • When the resource of nature is used haphazardly then ecosystem gets degrade.
  • The environmental pollution is becoming an increasingly worse problem that needs to be taken care of as soon as possible to protect the resources of the earth.
  • Pollution is created by individuals, communities and by industries that collect and dispose of pollutants improperly.

MCQs

No MCQs found.

Subjective Questions

Q1:

Construct a cumulative frequency table for the following data.

x 5 10 15 20 25 30
f 6 10 15 12 6 5

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="248"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>5</td> <td>6</td> <td>6</td> </tr><tr><td>10</td> <td>10</td> <td>16</td> </tr><tr><td>15</td> <td>15</td> <td>31</td> </tr><tr><td>20</td> <td>12</td> <td>43</td> </tr><tr><td>25</td> <td>6</td> <td>49</td> </tr><tr><td>30</td> <td>5</td> <td>54</td> </tr><tr><td></td> <td>N = 54</td> <td></td> </tr></tbody></table>

Q2:

Construct a cumulative frequency table by taking suitable class intervals.
32, 95, 98, 91, 40, 85, 46, 75, 82, 42, 48, 86, 72, 53, 81, 78, 47, 54, 59, 39
99, 49, 73, 69, 65, 59, 67, 51, 61, 87, 35, 58, 32, 74, 38, 50, 88, 37, 57, 55


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="260"><tbody><tr><td>Marks</td> <td>Frequency</td> <td>c.f</td> </tr><tr><td>30 - 40</td> <td>6</td> <td>6</td> </tr><tr><td>40 - 50</td> <td>6</td> <td>12</td> </tr><tr><td>50 - 60</td> <td>9</td> <td>21</td> </tr><tr><td>60 - 70</td> <td>4</td> <td>25</td> </tr><tr><td>70 - 80</td> <td>5</td> <td>30</td> </tr><tr><td>80 - 90</td> <td>6</td> <td>36</td> </tr><tr><td>90 - 100</td> <td>4</td> <td>40</td> </tr><tr><td></td> <td>N = 40</td> <td></td> </tr></tbody></table>

Q3:

Construct a cumulative frequency table by taking suitable class intervals.
61, 73, 75, 19, 16, 23, 72, 70, 37, 49, 55, 62, 67, 67, 65, 25
64, 53, 33, 47, 26, 36, 46, 51, 69, 48, 30, 20, 40, 50, 60, 79, 
21, 31, 41, 51, 62, 71, 53, 34, 39, 49, 59, 69, 74, 14


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="241"><tbody><tr><td>marks</td> <td>frequency</td> <td>c.f</td> </tr><tr><td>10- 20</td> <td>3</td> <td>3</td> </tr><tr><td>20 - 30</td> <td>5</td> <td>8</td> </tr><tr><td>30 - 40</td> <td>7</td> <td>15</td> </tr><tr><td>40 - 50</td> <td>7</td> <td>22</td> </tr><tr><td>50 - 60</td> <td>7</td> <td>29</td> </tr><tr><td>60 - 70</td> <td>9</td> <td>38</td> </tr><tr><td>70 - 80</td> <td>7</td> <td>45</td> </tr><tr><td></td> <td>N = 45</td> <td></td> </tr></tbody></table>

Q4:

Construct a cumulative frequency table for the following data:

Marks  40 50 60 70 80 90
No. of students 5 10 20 12 8 5

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="231"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>40</td> <td>5</td> <td>5</td> </tr><tr><td>50</td> <td>10</td> <td>15</td> </tr><tr><td>60</td> <td>20</td> <td>35</td> </tr><tr><td>70</td> <td>12</td> <td>47</td> </tr><tr><td>80</td> <td>8</td> <td>55</td> </tr><tr><td>90</td> <td>5</td> <td>60</td> </tr><tr><td></td> <td>N = 60</td> <td></td> </tr></tbody></table>

Q5:

Construct a cumulative frequency table for the following data.

x  5 10 15 20 25 30 35
f 2 4 8 10 12 14 16

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="243"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>5</td> <td>2</td> <td>2</td> </tr><tr><td>10</td> <td>4</td> <td>6</td> </tr><tr><td>15</td> <td>8</td> <td>14</td> </tr><tr><td>20</td> <td>10</td> <td>24</td> </tr><tr><td>25</td> <td>12</td> <td>36</td> </tr><tr><td>30</td> <td>14</td> <td>50</td> </tr><tr><td>35</td> <td>16</td> <td>66</td> </tr><tr><td></td> <td>N = 66</td> <td></td> </tr></tbody></table>

Q6:

Construct a cumulative frequency table for the following data.

marks 5 15 25 35 45
No. of students 3 8 13 10 4

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="285"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>5</td> <td>3</td> <td>3</td> </tr><tr><td>15</td> <td>8</td> <td>11</td> </tr><tr><td>25</td> <td>13</td> <td>24</td> </tr><tr><td>35</td> <td>10</td> <td>34</td> </tr><tr><td>45</td> <td>4</td> <td>38</td> </tr><tr><td></td> <td>N = 38</td> <td></td> </tr></tbody></table>

Q7:

Arrange the given data in ascending order.
75, 30, 35, 62, 49, 51, 54, 43, 70, 48


Type: Very_short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Arranging in ascerding order:<br>30, 35, 43, 48, 49, 51, 54, 62, 70, 75</p>

Q8:

Arrange the following in descending order.
84, 125, 88, 120, 116, 110, 90, 94, 105, 98, 80


Type: Very_short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Arranging in descerding order:<br>125, 120, 116, 110, 105, 98, 94, 90, 88, 84, 80</p>

Q9:

The marks obtained by 30 students in social are given below. Contruct a cumulative frequency table by taking suitable class intervals.
3, 8, 20, 12, 16, 13, 14, 17, 18, 25, 30, 28, 24, 23, 5
10, 33, 9, 11, 22, 48, 38, 37, 7, 27, 31, 21, 41, 49, 6


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="256"><tbody><tr><td>marks</td> <td>frequency</td> <td>c.f</td> </tr><tr><td>0 -10</td> <td>6</td> <td>6</td> </tr><tr><td>10 -20</td> <td>8</td> <td>14</td> </tr><tr><td>20 - 30</td> <td>8</td> <td>22</td> </tr><tr><td>30 - 40</td> <td>5</td> <td>27</td> </tr><tr><td>40 - 50</td> <td>3</td> <td>30</td> </tr><tr><td></td> <td>N = 30</td> <td></td> </tr></tbody></table>

Q10:

Construct a cumulative frequency table for the following data.

x  0 10 20 30 40 50 60 70 80
f 3 15 2 10 8 7 13 18 14

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="282"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>0</td> <td>3</td> <td>3</td> </tr><tr><td>10</td> <td>15</td> <td>18</td> </tr><tr><td>20</td> <td>2</td> <td>20</td> </tr><tr><td>30</td> <td>10</td> <td>30</td> </tr><tr><td>40</td> <td>8</td> <td>38</td> </tr><tr><td>50</td> <td>7</td> <td>45</td> </tr><tr><td>60</td> <td>13</td> <td>58</td> </tr><tr><td>70</td> <td>18</td> <td>76</td> </tr><tr><td>80</td> <td>14</td> <td>90</td> </tr></tbody></table><p>\(\therefore\) N = 90</p>

Q11:

Construct a cumulative frequency table for the following data.

Marks 0  20 40 80 100 120
No. of students 15 8 13 11 1 5

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="345"><tbody><tr><td>X</td> <td>frequency (f)</td> <td>cumulative frequency (c.f.)</td> </tr><tr><td>0</td> <td>15</td> <td>15</td> </tr><tr><td>20</td> <td>8</td> <td>23</td> </tr><tr><td>40</td> <td>13</td> <td>36</td> </tr><tr><td>80</td> <td>11</td> <td>47</td> </tr><tr><td>100</td> <td>1</td> <td>48</td> </tr><tr><td>120</td> <td>5</td> <td>53</td> </tr><tr><td></td> <td>N = 53</td> <td></td> </tr></tbody></table>

Q12:

Contruct a cumulative frequency table for the following data.

x 5 20 35 50 65 80
f 4 13 11 3 5 8

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="264"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>5</td> <td>4</td> <td>4</td> </tr><tr><td>20</td> <td>13</td> <td>17</td> </tr><tr><td>35</td> <td>11</td> <td>28</td> </tr><tr><td>50</td> <td>3</td> <td>31</td> </tr><tr><td>65</td> <td>5</td> <td>36</td> </tr><tr><td>80</td> <td>8</td> <td>44</td> </tr><tr><td></td> <td>N = 47</td> <td></td> </tr></tbody></table>

Q13:

Cunstruct a cumulative frequency table for the following data.

x 0 5 10 15 20 25 30
f 3 8 12 15 8  7 2

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="290"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>0</td> <td>3</td> <td>3</td> </tr><tr><td>5</td> <td>8</td> <td>11</td> </tr><tr><td>10</td> <td>12</td> <td>23</td> </tr><tr><td>15</td> <td>15</td> <td>38</td> </tr><tr><td>20</td> <td>8</td> <td>46</td> </tr><tr><td>25</td> <td>7</td> <td>53</td> </tr><tr><td>30</td> <td>2</td> <td>55</td> </tr><tr><td></td> <td>N = 55</td> <td></td> </tr></tbody></table>

Q14:

Construct a cumulative frequency table for the following data.

x 10 20 30 40 50
F 5 10 15 20 25

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="315"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>10</td> <td>5</td> <td>5</td> </tr><tr><td>20</td> <td>10</td> <td>15</td> </tr><tr><td>30</td> <td>15</td> <td>30</td> </tr><tr><td>40</td> <td>20</td> <td>50</td> </tr><tr><td>50</td> <td>25</td> <td>75</td> </tr><tr><td></td> <td>N = 75</td> <td></td> </tr></tbody></table>

Q15:

Construct a cumulative frequency table for the following data.

x 0 10 20 30 40 50 60
f 2 3 8 11 8 4 5

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="354"><tbody><tr><td>x</td> <td>f</td> <td>c.f</td> </tr><tr><td>0</td> <td>2</td> <td>2</td> </tr><tr><td>10</td> <td>3</td> <td>5</td> </tr><tr><td>20</td> <td>8</td> <td>13</td> </tr><tr><td>30</td> <td>11</td> <td>24</td> </tr><tr><td>40</td> <td>8</td> <td>32</td> </tr><tr><td>50</td> <td>4</td> <td>36</td> </tr><tr><td>60</td> <td>5</td> <td>41</td> </tr><tr><td></td> <td>N = 41</td> <td></td> </tr></tbody></table>

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Environment

Environment

The environment is only a place where all living beings can survive. Air, water, soil etc. are environmental components. People establish industry, build road, bridge, etc. Activities of people have negative effect on air, water and land. Degrade in the quality of environmental components is considered as environmental degradation.

Effects in environment by activities of people

With the ever increasing population of the world demand of people is also increasing. People fulfill their needs and demands by from the environment. Besides, every developmental activity like construction of the road, bridge, school, hospitals and so on is done on earth and done by the use of natural resources. When the resource of nature is used haphazardly then ecosystem gets degrade. These activities cause environmental pollution.

Environmental pollution

Environmental pollution is one of the biggest problems the world faces today. The environmental pollution is becoming an increasingly worse problem that needs to be taken care of as soon as possible to protect the resources of the earth. With the growing number of automobiles and the greenhouse effect problem becoming more and more of a threat, air pollution is something to be concerned with. Pollution is created by individuals, communities and by industries that collect and dispose of pollutants improperly. Many diseases have been evolving due to pollution. There are four types of pollution. They are:

  1. Air Pollution
  2. Water Pollution
  3. Land Pollution
  4. Noise Pollution

Lesson

Environmental Degradation and its Conservation

Subject

Science

Grade

Grade 8

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