Chapter 15 Part 3: Biodiversity and Conservation

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<Success><font size="5"><b>Biodiversity and Conservation</b></font></Success>
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<h4 id="primarylong-answer-type-questionsprimary-2"><Primary>Long Answer Type Questions</Primary></h4>
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<p><strong>Ans.</strong> When alien species are introduced unintentionally or deliberately in a habitat, some of them can cause decline or extinction of indigenous species, e.g., extensive environmental damage caused and threat posed to our native species by invasive weed species like carrot grass (Parthenium), Lantana and water hyacinth (Eichhornia).</p>
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<li>Another example of exotic species invasion is Nile perch, a large predator fish.</li>
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<p><Success>Ans. to be continued</Success></p>
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Multiple choice questions (MCQs) $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ <span style="color:blue">Long answer type questions</span>
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<Success><font size="5"><b>Biodiversity and Conservation</b></font></Success>
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<h4 id="primarylong-answer-type-questionsprimary-15"><Primary>Long Answer Type Questions</Primary></h4>
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<p><strong>Ans.</strong> The humans first evolved around 2.5 million years ago and agriculture began about 11 thousand years ago.</p>
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<li>It is since then that humans have started to exploit the forest land for agriculture.</li>
<li>Development in medical technology has increased the lifespan of humans, decreased the mortality rate of mother and child, further aggravating the problem of human population.</li>
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<p><Success>Ans. to be continued</Success></p>
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Multiple choice questions (MCQs) $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ <span style="color:blue">Long answer type questions</span>
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<Success><font size="5"><b>Biodiversity and Conservation</b></font></Success>
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<h4 id="primarylong-answer-type-questionsprimary-26"><Primary>Long Answer Type Questions</Primary></h4>
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<p>About $70-80    \%$ of entire population is dependent on plants or its extract for medicine.</p>
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<p>penicillin (Penicillium notatum), tetracycline (bacteria), digitalin (Digitalis) are some examples of medicinal plants.</p>
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<p>Plant like Chorchorus, Gossypium are sources of fibre while Jatropha is a source of biofuels.</p>
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<p>Fossils fuels (e.g., petrolum) are obtained from fossils of organisms.</p>
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Multiple choice questions (MCQs) $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ <span style="color:blue">Long answer type questions</span>
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