Question

138. वैश्विक पर्यावरण के लिए सर्वाधिक महत्वपूर्ण वन है।
(अ) उष्णकटिबन्धीय वर्षा वन
(ब) शीतोष्णकटिबन्धीय वन
(स) मानसूनी वन (द) भूमध्यसागरीय वन

139. उष्णकटिबन्धीय वनों में नहीं पाया जाता है।
(अ) सागौन
(ब) आयरन वुड
(स) साल
(द) चीड

141 सागौन लकडी का सर्वाधिक निर्यात करने वाला देश हैं।
(अ) म्यांमार
(ब) थाईलैण्ड
(स) कांगो
(द) ब्राजील

143. नव्यकरणीय संसाधन नहीं है।
(अ) वन
(ब) चारागाह
(स) मृदा
(द) प्राकृतिक गैस

144. अक्षय प्राकृतिक संसाधन का उदाहरण हैं।
(अ) सौर्यिक ऊर्जा
(ब) वन
(द) खनिज
​

Answer 1

Answer:

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Question:−

What are Tissues in Biology.

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Answer:−

Animal cells and plant cells can form tissues , such as muscle tissue in animals. A living tissue is made from a group of cells with a similar structure and function, which all work together to do a particular job.

\huge\blue\bigstar\pink{Additional \: Information }★Additional Information★AdditionalInformation★AdditionalInformation

There are 4 basic types of tissue: connective tissue, epithelial tissue, muscle tissue, and nervous tissue. Connective tissue supports other tissues and binds them together (bone, blood, and lymph tissues). Epithelial tissue provides a covering (skin, the linings of the various passages inside the body).

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Question:−

Simplify the problem.

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Solution:−

$\sqrt{a + b + 2x + 2 \sqrt{ab + (a + b)x + {x}^{2} } }$

Now, let

y = $\sqrt{ab + (a + b)x + {x}^{2} }$y=

Therefore,

$\sqrt{a + b + 2x + 2 \sqrt{ab + (a + b)x + {x}^{2} } }$

= $\sqrt{a + b + 2x + 2 + 2 \sqrt{y} }$=

Now, we will factorise y.

$\sqrt{ab + (a + b)x + {x}^{2} }$

= $\sqrt{ab + ax + bx + {x}^{2} }$=

= $\sqrt{a(b + x) +x(b+ x)}$=

= $\sqrt{(x + a)(x + b)}$=

Now,

= $\sqrt{a + b + 2x + 2 + 2 \sqrt{y} }$=

= $\small\sqrt{(x + a) + (x + b) + 2 \sqrt{(x + a)(x + b)} }$=

= $\sqrt{ {( \sqrt{x + a}) }^{2} + {( \sqrt{(x + b} )}^{2} + 2 \times \sqrt{(x + a} \times \sqrt{(x + b)} }$=

= $\sqrt{ {( \sqrt{x + a} + \sqrt{x + b} )}^{2} }$=

= $\sqrt{x + a} + \sqrt{x + b}$=

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$\sqrt{x + a } + \sqrt{x + b}$$\fcolorbox{aqua}{lime}{✓Verified\:Answer}$

$\huge\underline\star\mathcal\blue{Question:-}$

What are Tissues in Biology.

$\huge\underline\star\mathcal\red{Answer:-}$

Animal cells and plant cells can form tissues , such as muscle tissue in animals. A living tissue is made from a group of cells with a similar structure and function, which all work together to do a particular job.

$\huge\blue\bigstar\pink{Additional \: Information }$

There are 4 basic types of tissue: connective tissue, epithelial tissue, muscle tissue, and nervous tissue. Connective tissue supports other tissues and binds them together (bone, blood, and lymph tissues). Epithelial tissue provides a covering (skin, the linings of the various passages inside the body).

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✪QUESTION✪:-

Find the Solution of the given condition

$\sf\dfrac{dy}{dx} - 3y \: cot \: x = sin2x,y = 2 \: when \: x = \dfrac{\pi}{2}$

✪SOLUTION✪

•The given differential equation is a linear differential equation i.e, of the form $\displaystyle\sf\dfrac{dy}{dx}$+Py=Q

P=-3cot x and Q=sin 2 x

Here,⠀

$\sf I.F.={ \sf e\:}^{ \displaystyle \sf\int \small P \: dx}={e}^{ \displaystyle \sf\int \small -3 \: cot \: x}$

⠀⠀

$\displaystyle \sf = {e}^{ - 3 \: log(sin \: x)} = {e}^{log(sin \: x) ^{ - 3} }$=e

⠀⠀⠀⠀⠀⠀⠀⠀⠀$\sf( Assuming\:0 < x < \pi)(Assuming0<x<π)$

⠀⠀

$\sf = {(sin \: x)}^{ - 3}$=(sinx)

Hence,the solution of the given equation is given by

⠀⠀

$\displaystyle \sf y{(sin \: x)}^{ - 3} = \int {(sin \: x)}^{ - 3} cos \: x \: dx+Cy(sinx)$

= $\displaystyle\sf2\int {(sin \: x)}^{ - 2} cos \: x \: dx=2∫(sinx)$⠀

$\displaystyle \sf = \dfrac{2{(sin \: x)}^{ - 1} }{ - 1}$ + C=

⠀⠀$\sf or \: y = - 2{(sin \: x)}^{3 - 1} + C \: {sin}^{3}xory=−2(sinx)$

⠀⠀$\sf or \: y = - 2{(sin \: x)}^{2} + C \: {sin}^{3}$x .....(1)

When $\sf x=\dfrac{\pi}{2},\:then\:y=2x$=

⠀⠀

$\sf \therefore2 = - 2{ sin}^{2} \bigg( \dfrac{ \pi}{2}\bigg) + C \:{sin}^{3} \bigg( \dfrac{\pi}{2} \bigg)$⠀

$\implies \sf2$ = - 2 + C⟹2=−2+C

⠀⠀

$\implies \sf C=4⟹C=4</p><p></p><p>Hence the required solution is</p><p></p><p>[tex]\sf \: y = - 2{(sin \: x)}^{2} + 4{sin}^{3}$x .......(from 1)