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CBSE Class 12 · Biology

Biodiversity and Conservation

Official NCERT chapter from Biology (book code lebo1). ExamMaster notes are original teaching at CBSE Class 12 depth.

This lesson follows the official chapter “Biodiversity and Conservation” in Biology. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 12
  • Medium level
  • 8 concepts

1Biodiversity

Biodiversity: many kinds at gene, species, and ecosystem looks as taught. Diversity is a many-kinds fact, not a poster of “nature is nice”. One local two-kinds start is enough.

Calling every green thing “the same plant” hides diversity.

Figure. Biodiversity is three nested scales: alleles inside a species, species inside a habitat, habitats inside a landscape. A labelled part with no scale is a glossary, not the chapter.

How it works

  1. Name many kinds, or the three looksBiodiversity.
  2. Keep gene / species / ecosystem if askedThe extras.
  3. Refuse a slogan as the testMany kinds.

2Biodiversity Conservation

Biodiversity conservation: keeping those kinds as taught — a job, not a sticker. Conservation is a keep-job. One reason-heading will sit next; how will sit after.

A picnic as “conservation” with no keep-job is a miss.

Figure. Conservation is one job aimed at all three levels at once. Protecting a name on a list while the habitat goes is only one level, and that is not the chapter.

How it works

  1. Name the keep-jobConservation.
  2. Keep it a job-wordNot a picnic.
  3. Refuse a sticker as the scienceA keep.

3Why should we conserve Biodiversity?

Why conserve: use, option, and a taught ethics-look as framed (or the lesson’s list). Why is a reason-column, not a scare. One honest reason is enough.

A skull-sticker with no reason-word is a mute scare.

Figure. NCERT gives three independent reasons to conserve: a narrow use (food, medicine), a broad use (ecosystem services), and an ethical duty that does not wait on a use.

How it works

  1. Name a taught reasonThe why.
  2. Keep use / option / ethics if listedThe extras.
  3. Refuse a scare as the whyA reason.

4How do we conserve Biodiversity?

How we conserve: protect a place, or keep a case off-site, as taught. How is a job-split that the next two headings will name. One honest split-hint is enough here.

A poster as “how” with no place or case is a miss.

Figure. How we conserve splits on one test: does the species stay in its habitat (in-situ) or is it moved to a store (ex-situ)? Both are jobs. They are not the same job.

How it works

  1. Name protect-a-place or keep-a-caseThe how-hint.
  2. Keep the next headings as the namesIn-situ / ex-situ.
  3. Refuse a poster as the methodA job.

5A hotspot is a named place with a test

A hotspot is a named place with a test: many kinds and a threat as taught. Hotspot is a place-plus-test, not “warm weather”. One named hotspot if the lesson used one is enough.

A desert labelled hotspot because it is hot is a miss.

Figure. A hotspot is a named place that passes two tests at once: many species found nowhere else, and a habitat already badly cut. One test alone is not the school name. Western Ghats is one such named place.

How it works

  1. Name many kinds plus a threatThe test.
  2. Keep a taught place if listedThe case.
  3. Refuse weather as the testA diversity-word.

6In-situ and ex-situ are two different jobs

In-situ and ex-situ are two different jobs: protect in the place versus keep a case in a zoo, garden, or bank as taught. In-situ is on-site; ex-situ is off-site. Two words, two jobs.

A zoo labelled in-situ because animals sit there is a miss.

Figure. In-situ keeps the species in the living place. Ex-situ moves the organism to a store and leaves the place behind. Same species, two different jobs.

How it works

  1. Name on-site versus off-siteThe split.
  2. Keep park/sanctuary as in-situ if taughtThe extra.
  3. Keep zoo/bank as ex-situThe other job.

7Keep the claim at this class

Keep the claim at this class: many kinds, a why, a how-split, a hotspot-test. It is not a treaty-essay.

A journal-abstract tone is the wrong size.

Figure. Hold the claim at this class: three levels, two methods, a named hotspot test. A later-exam exception list is a different chapter, not a deeper version of this one.

How it works

  1. Stay on the school mapsThis class.
  2. Keep one local case if neededEnough.
  3. Refuse a treaty-dumpThe claim-size.

8A miss: treating a poster as conservation

A miss: treating a poster as conservation. A pretty tiger is a setting; conservation is the keep-job (place or case). A sticker is not the method.

A logo as “I conserved” is the miss.

Figure. A poster can name a species. Conservation is the job that keeps the place (or the store) working. Treating the poster as the job is the miss this concept exists to kill.

How it works

  1. Keep the poster as a settingA doorway.
  2. Add the keep-jobThe science.
  3. Refuse a sticker as the chapterThe miss named.
In-situ means
  1. Protect in the place as taught
  2. A zoo-only keep always
  3. A hotspot weather

On-site.

Notes

  • Mapped to the official NCERT chapter “Biodiversity and Conservation”. Original teaching only — no textbook sentences.
  • Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.

Recap

Hold these pegs from the official chapter “Biodiversity and Conservation”. The wording is ExamMaster’s teaching, not a textbook recap.

Biodiversity
Biodiversity: many kinds at gene, species, and ecosystem looks as taught.
Biodiversity Conservation
Biodiversity conservation: keeping those kinds as taught — a job, not a sticker.
Why should we conserve Biodiversity?
Why conserve: use, option, and a taught ethics-look as framed (or the lesson’s list).
How do we conserve Biodiversity?
How we conserve: protect a place, or keep a case off-site, as taught.
A hotspot is a named place with a test
A hotspot is a named place with a test: many kinds and a threat as taught.
In-situ and ex-situ are two different jobs
In-situ and ex-situ are two different jobs: protect in the place versus keep a case in a zoo, garden, or bank as taught.

Practise Biodiversity and Conservation

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