- 1(current)
Q. No.Keystone species deserve protection because these
(1) are capable of surviving in harsh envinmental conditions
(2) indicate presence of certain mineral in the soil
(3) have become rare due to over exploitation
(4) play an important role in supporting other species.
What is a keystone species?
(1) 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,
(2) A common species that has plenty of biomass, yet has a fairly low impact on the community's organization
(3) A rare species that has minimal impact on the biomass and on other species in the community.
(4) A dominant a large proportion of the biomass and which affects many other species.
A keystone species is one that:
(1) Has a higher likelihood of extinction than a non keystone species
(2) Exerts a strong influence on an ecosystem
(3) Causes other species to become extinct
(4) Has a weak influence on an ecosystem
Who among the following gave tentative answers to the question that how do the attributes of a stable community are linked to species richness in a community?
1. Paul Ehrlich
2. David Tilman
3. A V. Hamboldt
4. Edward Wilson
Rich biodiversity is not important for
1. Healthy ecosystem
2. Survival of human race on this planet
3. Alien species
4. Both (1) and (2)
Paul Ehrlich
Which of the following is wrong about him?
| 1. | Stanford Ecologist |
| 2. | Rivet Popper Hypothesis |
| 3. | Importance of species actually affects the extent of stability of ecosystem |
| 4. | Worked on Outdoor plots for the apology he proposed |
David Tilman actually proposed that
| 1. | The long term ecosystem experiments using out door plots with less species showed less year to year variation in total number |
| 2. | The long term ecosystem experiments using out door plots with more species showed less year to year variation in total biomass |
| 3. | The long term ecosystem experiments using out door plots with more species showed more year to year variation in total number |
| 4. | The long term ecosystem experiments using indoor plots with less species showed less year to year variation in total biomass |
According to Rivet Popper Hypothesis, which of the following is not correct?
1. Airplane: ecosystem
2. Rivets: species
3. Popping a rivet: causing a species to become extinct
4. Flight safety: number of species
Which of the following loss of rivet will be more crucial for the flight safety?
1. Loss of rivets on the wings
2. Loss of rivets on the seats
3. Loss of rivets on Windows inside the plane
4. Both A and C
Which of the following is not correct according to analogy given by Paul Ehrlich?
| 1. | Loss of the key species that drive the major ecosystem functions is a more serious threat to flight safety than loss of other less important species |
| 2. | Proper functioning of ecosystem is initially may not be affected by species loss |
| 3. | Over a period of time, if the species loss is continuous, the ecosystem gets affected after a time |
| 4. | Even the loss of not much significant species lead to critical damage to ecosystem. |
- 1(current)
Q. No.
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