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Class 12 Biodiversity and its Conservation worksheet
CBSE Biology. Levels and patterns of biodiversity, species–area relationship, the evil quartet, conservation. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The term 'biodiversity' was popularised by the sociobiologist:
- David Tilman
- Robert May
- Paul Ehrlich
- Edward Wilson
Answer
(d) Edward Wilson
- 2.
Which cause of biodiversity loss is shown by the passenger pigeon hunted to extinction?
- over-exploitation
- habitat loss and fragmentation
- alien species invasion
- co-extinction
Answer
(a) over-exploitation
the "evil quartet"
- 3.
Which of these is an ex situ method of conservation?
- National parks
- Community reserves
- Biosphere reserves
- Wildlife safari parks
Answer
(d) Wildlife safari parks
in situ: in the natural habitat; ex situ: outside it
Section B · short answer
- 4.
Name the three levels of biodiversity.
Answer
Genetic diversity (within a species), species diversity (between species) and ecological diversity (between ecosystems).
- 5.
For a group of plants, S = CAᶻ with C = 16 and Z = 0.25. How many species would an area of 10⁸ km² hold? What does Z show?
Answer
S = 16 × 10² = 1,600; Z is the slope of the log–log line, which shows how fast species richness rises with area
(10⁸) to the power 0.25 = 10²
Section C · long answer
- 6.
Describe the three levels of biodiversity with examples.
Answer
Genetic diversity: a single species can show high diversity at the genetic level; Rauwolfia vomitoria in the Himalaya varies in the amount of reserpine it produces, and India has more than 50,000 strains of rice and 1,000 varieties of mango. Species diversity: the number of species in a region; the Western Ghats have more amphibian species than the Eastern Ghats. Ecological diversity: India's deserts, rain forests, mangroves, coral reefs, wetlands, estuaries and alpine meadows give greater ecosystem diversity than a Scandinavian country such as Norway.
Fresh sheets for your child
In the app, every Biodiversity and its Conservation sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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