Q. No.| 1. | Volcanic eruptions |
| 2. | Human activities like habitat destruction and climate change |
| 3. | Asteroid impacts |
| 4. | Natural selection |
Q.15 Which of the following forests is known as the "Lungs of the planet Earth?
1. Taiga forest
2. Tundra forest
3. Amazon rain forest
4. Rainforests of North-East India
1. Keystone species
2. Ecotypes
3. Sibling species
4. Invasive species
1. Habitat loss and fragmentation
2. Alien species invasions
3. Over-exploitation
4. Co-extinctions
Main reason for disturbance of biological diversity:
1. Greenhouse effect
2. Hunting
3. Soil erosion
4. Destruction of natural habitats
Loss of biodiversity in a region may lead to
(1) Decline in plants production
(2) Lowered resistance to environmental perturbations such as draught.
(3) Increased variability in certain ecosystem process such as plant productivity, water use, and pest and disease cycle
(4) All of these
Which of the following come under the "Evil Quarter"?
| (a) | Habitat loss and fragmentation | (b) | Over-exploitation |
| (c) | Alien species invasion | (d) | Mortality |
| (e) | Competition | ||
Choose the correct answer from the options given below:
| 1. | (a), (c) and (d) | 2. | (b), (c) and (d) |
| 3. | (a), (b) and (c) | 4. | (a), (b) and (d) |
The decline in the population of Indian native fishes due to the introduction of Clarias gariepinus in the river Yamuna can be categorised as:
| 1. | Co-extinction |
| 2. | Habitat fragmentation |
| 3. | Over-exploitation |
| 4. | Alien species invasion |
Red List contains data or information on?
1. all economically important plants
2. plants whose products are in international trade
3. threatened species
4. marine vertebrates only
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