(a) Redraw the pie chart identifying the groups ’A’, ’B’, ’C’, and ’D’ in their respective positions.
(b) Mention two examples of recently extinct animals.
(b) Mention two examples of recently extinct animals.
Solution and Explanation
(a) The pie chart represents the global diversity of vertebrates. Based on the typical representation:
- A: Amphibians
- B: Reptiles
- C: Birds
- D: Mammals
- The largest section corresponds to Fishes, as they represent the most diverse group among vertebrates.
Redrawn Pie Chart: 
(b) Two examples of recently extinct animals: 1. Passenger Pigeon (Ectopistes migratorius): Went extinct in 1914 due to overhunting and habitat destruction. 2. Western Black Rhinoceros (Diceros bicornis longipes): Declared extinct in 2011 due to poaching.
Top Questions on Biodiversity and Conservation
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- GUJCET - 2025
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- CBSE CLASS XII - 2025
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- Student to attempt either option-(A) or (B): (A)
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How have the following contributed to biodiversity loss?- I. Nile Perch
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- [(ii)] Why have certain regions been declared as biodiversity hotspots by environmentalists of the world? Name any two such regions in India.
(B)- [(i)] Write an equation for Verhulst-Pearl Logistic Growth Curve where:
N = Population density at time ‘t’
r = Intrinsic rate of natural increase - [(ii)] Draw a graph for a population whose population density has reached carrying capacity.
- [(iii)] Draw a growth curve where resources are non-limiting to growth of population.
- [(iv)] Which growth curve is considered more realistic and why? Explain.
- CBSE CLASS XII - 2025
- Biology
- Biodiversity and Conservation
- [(i)] How does alien species invasion cause a decline in biodiversity? Explain.
- India has only 2.4% of the world's land area but its share of the global species diversity is:
- CBSE CLASS XII - 2025
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Answer the following questions:
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OR - Explain how more than a billion copies of a fragment of DNA are formed using the technique of PCR.
- CBSE CLASS XII - 2025
- Biology
- Biodiversity and Conservation
- Explain how the process of RNA interference technology is used effectively to prevent infestation of the roots of tobacco plant by the nematode Meloidogyne incognita.
Questions Asked in CBSE CLASS XII exam
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(a) Calculate the amount of work done to separate the two charges at infinite distance.
(b) If this system of charges was initially kept in an electric field \[ \vec{E} = \frac{A}{r^2}, \text{ where } A = 8 \times 10^4\, \text{N}\,\text{C}^{-1}\,\text{m}^2, \] calculate the electrostatic potential energy of the system.- CBSE CLASS XII - 2025
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A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?
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