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(i) Name the two… (Class 12 Biology SQP 2024-25, Q33B)

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BiologyCBSE Class 12 · Sample paper, session 2024-25 · 5 marks · Long answer

CBSE Class 12 Biology sample paper 2024-25: question 33(B)

From the official CBSE sample question paper for 2024-25, section E, question 33(B), for 5 marks. Try it first; the hints and our step-by-step solution are below.

Q33(B) · 5 marks · Long answerBiodiversity and Conservation

(i) Name the two types of desirable approaches to conserve biodiversity? Explain with examples bringing out the difference between the two types.
(ii) State the features of a stable biological community?

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

Open one hint at a time and try again before the next.

Hint 1

The two approaches differ in where the species is protected: on site or off site.

Hint 2

Name national parks and sacred groves for one approach, and zoos and seed banks for the other.

Hint 3

For stability, think about productivity over the years, response to disturbance, and response to alien species.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (i) In situ conservation (on site): the species is protected in its natural habitat, so the whole ecosystem is conserved. Examples include biodiversity hotspots, national parks, wildlife sanctuaries, biosphere reserves and sacred groves (e.g. Khasi and Jaintia hills in Meghalaya).

    1 mark

  2. (i) Ex situ conservation (off site): threatened species are taken out of their natural habitat and protected in special settings. Examples include zoological parks, botanical gardens, wildlife safari parks, cryopreservation of gametes, seed banks, and in vitro fertilisation and tissue culture.

    Difference: in situ protects species together with their habitat and natural interactions. Ex situ protects individual species in artificial surroundings, mainly for those on the verge of extinction.

    1 mark

  3. (ii) Feature 1: a stable community does not show too much variation in productivity from year to year.

    1 mark

  4. (ii) Feature 2: it is resistant or resilient to occasional natural or man-made disturbances.

    1 mark

  5. (ii) Feature 3: it is resistant to invasion by alien species. (Tilman's experiments showed that plots with more species had less year-to-year variation in total biomass.)

    1 mark

Answer: (i) In situ conservation protects species in their natural habitat (national parks, sanctuaries, biosphere reserves, sacred groves). Ex situ conservation protects them outside their natural habitat (zoos, botanical gardens, seed banks, cryopreservation). (ii) A stable community has little year-to-year variation in productivity, is resistant or resilient to disturbances, and resists alien species invasion.

Where the marks are

  • In situ conservation named and explained with examples (1 mark)
  • Ex situ conservation named and explained with examples, with the difference brought out (1 mark)
  • Little variation in productivity from year to year (1 mark)
  • Resistant or resilient to occasional disturbances (1 mark)
  • Resistant to invasion by alien species (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Biodiversity and Conservation, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2024-25: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.