Methods of Conserving Environment

The Ministry of Forest and Soil Conservation has launched various programmes for the conservation of forest and environment. This note provides us with an information about methods of conservation of environment.

Summary

The Ministry of Forest and Soil Conservation has launched various programmes for the conservation of forest and environment. This note provides us with an information about methods of conservation of environment.

Things to Remember

  • The Ministry of Forest and Soil Conservation has launched various programmes for the conservation of forest and environment.
  • Reforestation, tree plantation, protection of pasture land help to conserve the soil.
  • Proper management of solid wastes helps to keep the surrounding healthy. Local level authorities like municipalities, VDC, etc.
  • People should be aware of the consequences of their activities.
  • House, market area, industry, settlement area, etc. are the sources of solid wastes. Proper management of solid wastes helps to keep the surrounding healthy.
  • Industries and vehicles emit the smoke, dust and harmful gases that pollute the environment.
  • Temple, gumba, chaityas, Dharamshala, parties and pauwas are our cultural heritage.

MCQs

No MCQs found.

Subjective Questions

Q1:

Give the example of four rational number which aren't whole number.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <ol><li>0.5</li> <li>0</li> <li>-100</li> <li>\(\frac{3}{5}\)</li> </ol>

Q2:

Give an example of irrational number whose sum is rational.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <ol><li>&radic;5 and 5-&radic;5</li> <li>&radic;3+2 and 3-&radic;3</li> </ol>

Q3:

Give an example of two  irrational number whose product  is rational.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <ol><li>&radic;3 and -&radic;3</li> <li>&radic;5 and -&radic;5</li> </ol>

Q4:

Write five rational number between \(\frac{1}{2}\) and \(\frac{3}{5}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\frac{1}{2}\) and \(\frac{3}{5}\)</p> <p>0.50 0.60</p> <p>0.51 0.61</p> <p>0.52 0.62</p> <p>0.54 0.64</p> <p>0.56 0.66</p> <p>0.58 0.68</p>

Q5:

Identify the following statements as true or false.

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>a) &pi; is an irrational number. ( True)</p> <p>b) -&radic;3 is an irrational number. (True)</p> <p>c) Irrational numbers cannot be represented by points on the number line. (False)</p> <p>d) All real number are rational ( False)</p> <p>e) Every real number is not a rational number. (True)</p>

Q6:

Find the irrational number of √2.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>&radic;2 = 1.41421356.......</p>

Q7:

Give an example of four rational number, which isn't whole number.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>1) 0.75</p> <p>2) -100</p> <p>3) \(\frac{7}{20}\)</p> <p>4) 0</p>

Q8:

Give an example of the irrational number, whose sum is rational.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>1) \(\sqrt{3 }\) and 3 -\(\sqrt{3}\)</p> <p>2) \(\sqrt{7 }\)+ 2 and 7 -\(\sqrt{7}\)</p>

Q9:

Give an example of two irrational number whose product is rational.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>1) \(\sqrt{5}\) and -\(\sqrt{5}\)</p> <p>2) \(\sqrt{7 }\) and -\(\sqrt{7}\)</p>

Q10:

Find the sum of two irrational numbers which is not always an irrational number?


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>( 2+\(\sqrt{3}\)) + ( 2 - \(\sqrt{3}\)) = 4, which is rational.</p> <p>The sum of two irrational numbers is not always an irrational number.</p>

Q11:

 Find the product of two irrational numbers which is not always irrational numbers?


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>( 2 + \(\sqrt{3}\)) \(\times\) ( 2 - \(\sqrt{3}\)) </p> <p>= 2<sup>2</sup> + (\(\sqrt{3}\))<sup>2</sup></p> <p>= 4 - 3</p> <p>= 1, which is rational.</p> <p>So, the product of two irrational numbers is not always irrational numbers.</p>

Q12:

Which of the following are irrational numbers?


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>a) \(\frac{4}{7}\) (Rational)</p> <p>b) -\(\frac{2}{5}\) (Rational)</p> <p>c) \(\sqrt{4}\) (Rational)</p> <p>d) \(\sqrt[3]{8}\) (Rational)</p> <p>e) \(\sqrt{3}\) (Irrational)</p> <p>f) 2 - \(\sqrt{3}\) (Irrational)</p> <p>g) - \(\sqrt{7}\) (Irrational)</p> <p>h) \(\sqrt{25}\) (Rational)</p> <p>i) 0.75 (Rational)</p>

Q13:

Divide: 

9/16 by 5/8


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>9/16 &divide; 5/8<br><br>= 9/16 &times; 8/5<br><br>= (9 &times; 8)/(16 &times; 5)<br><br>= 72/80<br><br>= 9/10</p>

Q14:

Divide:

-6/25 by 3/5

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>-6/25 &divide; 3/5<br><br>= -6/25 &times; 5/3<br><br>= {(-6) &times; 5}/(25 &times; 3)<br><br>= -30/75<br><br>= -2/5</p>

Q15:

Divide:

11/24 by -5/8


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>11/24 &divide; (-5)/8<br><br>= 11/24 &times; 8/(-5)<br><br>= (11 &times; 8)/{24 &times; (-5)}<br><br>= 88/-120<br><br>= -11/15</p>

Q16:

The product of two numbers is -28/27. If one of the numbers is -4/9, find the other. 


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Let the other number be x.<br><br>Then, x &times; (-4)/9 = -28/27<br><br>or, x = (-28)/27 &divide; (-4)/9<br><br>or, x = (-28)/27 &times; 9/-4<br><br>or, x = {(-28) &times; 9}/{27 &times; (-4)}<br><br>or, x = -(28 &times; 9)/-(27 &times; 4)<br><br>or,x =(287&times;91)/(273&times;41)<br><br>\(\therefore\)x = 7/3<br><br>Hence, the other number is 7/3.<strong><br></strong></p>

Q17:

Find the product of two rational numbers?

(-25/9) by (-18/15)


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>(-25/9) &times; (-18/15)</p> <p>= (-25) &times; (-18)/9 &times; 15</p> <p>= 450/135</p> <p>= 10/3</p> <p></p>

Q18:

Find the product of two rational numbers. 

6/11 × (-55)/36


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>6/11 &times; (-55)/36</p> <p>= 6 &times; -55/11 &times; 36</p> <p>= -330/396</p> <p>= -5/6</p>

Q19:

Subtract:

2/5 from 4/7


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>The additive inverse of 2/5 is -2/5</p> <p>4/7 - 2/5</p> <p>= 4/7 + (-2/5)</p> <p>= 4 &times; 5/7 &times; 5 + (-2) &times; 7/5 &times; 7</p> <p>= 20/35 + -14/35</p> <p>= 20 + (-14)/35</p> <p>= 6/35</p> <p></p>

Q20:

Determine whether the following rational numbers are positives or not.

(-11)/3


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>(-11)/3 is not a positive rational. Since both the numerator and denominator are of the opposite sign.</p> <p></p>

Q21:

Determine whether the following rational number is positives or negetive.

25/(-27)


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>25/(-27) is not a positive rational. Since both the numerator and denominator are of the opposite sign.</p>

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Methods of Conserving Environment

Methods of Conserving Environment

Different types of environmental sources are used by people in their daily life to fulfil their survival needs. Various types of developmental works like industries, construction of roads, construction of buildings, irrigation project, etc are conducted in the country to get valuable services and facilities that we need. We should not destroy the environment while conducting the developmental activities.

Some of the efforts and programmes that are being implemented in the protection of environment are as follows: -

1. Forest Conservation

Forest plays the vital role for the environment conservation. The Ministry of Forest and Soil Conservation has launched various programmes for the conservation of forest and environment. Community Forest Programme is one of the examples of conservation programmes that help to protect the land, water and other components of the environment. Afforestation must be done for the conservation of forest. Laws about forest protection and awareness generation help in the conservation programme.

2. Soil Conservation

Soil conservation is an important work of environmental conservation. Control of landslides, flood, soil erosion helps to protect the land. Afforestation, tree plantation, protection of pasture land help to conserve the soil. Terrace farming on slope land, use of compost fertilizer and minimizing the use of chemicals also helps to protect the soil. Ministry of Forest and Soil Conservation, Ministry of Agriculture, etc. are conducting various programmes to protect the soil.

3. Waste Management

House, market area, industry, settlement area, etc. are the sources of solid wastes. Proper management of solid wastes helps to keep the surrounding healthy. Local level authorities like municipalities, VDC, etc. have been conducting various programmes for the management of solid wastes. Construction of toilets in every house and management of enough public toilet also help to keep the environment healthy.

4. Public Awareness

People should be aware of the consequences of their activities. There are various means to aware people by conducting rally and drama. Media should also play the active role to aware the people.

5. Pollution Control

Industries and vehicles emit the smoke, dust and harmful gases that pollute the environment. Chemical fertilizer and chemical poisons like insecticides, herbicides, pesticides, etc. also pollute the environment. Pollution must be controlled to keep the environment healthy. The government of Nepal is making an effort to control the pollution.

6. Conservation of Heritage

Temple, gumba, chaityas, Dharamshala, parties and pauwas are our cultural heritage. They are our identity. They must be preserved for future generation. We must keep the areas of cultural heritage free from pollution.

Lesson

Environmental Degradation and its Conservation

Subject

Science

Grade

Grade 8

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