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Biodiversity and Conservation · Question 80

AIPMT 2004MCQEasy📈 Topic in 0% papers+4−1
1

What is a keystone species ?

  1. A dominant species that constitutes a large proportion of the biomass and which affects many other species
  2. A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival
  3. A common species that has plenty of biomass, yet has a fairly low impact on the community's organization
  4. A rare species that has minimal impact on the biomass and on other species in the community

Answer

(2) A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival

Solution

A keystone species is a species whose effect on the community is very large compared with its abundance or biomass.

⇒ Its removal changes the structure and survival of the whole community (e.g. fig trees in tropical forests, sea star Pisaster in rocky intertidal communities).

∴ It forms only a small part of the total biomass but has a huge impact on the community's organisation.

Answer: (2)

AIPMT 2004

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2

An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having -

  1. High stability and high resilience
  2. Low stability and high resilience
  3. High stability and low resilience
  4. Low stability and low resilience
AIPMT 2004
3

In your opinion, which is the most effective way to conserve the plant diversity of an area ?

  1. By creating botanical garden
  2. By creating biosphere reserve
  3. By tissue culture method
  4. By developing seed bank
AIPMT 2004
4

Which group of vertebrates comprises the highest number of endangered species ?

  1. Fishes
  2. Mammals
  3. Birds
  4. Reptiles
AIPMT 2003
5

Which endangered animal is the source of the world's finest, lightest, warmest and most expensive wool - the shahtoosh ?

  1. Kashmiri goat
  2. Chiru
  3. Nilgai
  4. Cheetal
AIPMT 2003
6

Wildlife is continuously decreasing. What is the main reason of this ?

  1. Cutting down of forest
  2. Predation
  3. Hunting
  4. Destruction of habitat
AIPMT 2002
7

Indri-indri lemur is found in:

  1. Sri Lanka
  2. Mauritius
  3. Madagascar
  4. India
AIPMT 2000
8

Viable material of endangered species can be preserved by:

  1. Gene library
  2. Gene bank
  3. Gene pool
  4. Herbarium
AIPMT 2000

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