Q. No.Match each item in Column I with one item in Column II and select the correct match from the codes given:
| COLUMN I | COLUMN II | ||
| A | Largest marine animal phylum | P | Arthropoda |
| B | Largest animal phylum | Q | Mollusca |
| C | Largest vertebrate class | R | Pisces |
| D | Largest vertebrate endotherm class | S | Aves |
Codes
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | P | S | R |
| 3. | P | Q | S | R |
| 4. | Q | P | R | S |
| Assertion (A): | Endemic organisms with limited ranges are most affected by habitat destruction. |
| Reason (R): | These organisms are not found anywhere else in the world, and thus have less chance of recovering. |
In the light of the above statements, choose the most appropriate answer from the options given below :
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Consider the following statements:
I. India’s share of the global species diversity is 8.1% approximately.
II. Two ecological hot spots of the world cover our bio-diversity regions.
III. The Amazon rainforest has the greatest biodiversity on Earth.
Which of the above statements are true?
1. I and II only 2. I and III only
3. II and III only 4. I, II, and III
What is common to the following plants: Nepenthes, Psilotum, Rauwolfia, and Aconitum?
1. All are ornamental plants
2. All are phylogenic link species
3. All are prone to over-exploitation
4. All are exclusively present in the Eastern Himalayas
| 1. | Thylacine is an extinct carnivorous marsupial that was native to the Australian mainland. |
| 2. | The mass extinction currently in progress is the fifth mass extinction. |
| 3. | Habitat loss and fragmentation is the most important cause driving animals and plants to extinction. |
| 4. | The Nile perch introduced into Lake Victoria became invasive. |
| Extinct animal | Country/continent | ||
| A | Stellar’s sea cow | P | Australia |
| B | Thylacine | Q | Russia |
| C | Quagga | R | Mauritius |
| D | Dodo | S | Africa |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | P | S | R |
| 3 | R | S | P | Q |
| 4. | S | R | Q | P |
| I: | Among invertebrates maximum species richness is seen in insects |
| II: | Among vertebrates maximum species richness is seen in mammals |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| 1. | Habitat loss and fragmentation |
| 2. | Over-exploitation |
| 3. | Invasion from alien species |
| 4. | Co-extinctions |
The current extinction is called a ‘biodiversity crisis’ because:
1. the extinctions are not a natural phenomenon
2. the rates are high and is due to the human activities
3. the extinction is mainly affecting animals rather than plants
4. only keystone species are being lost
| I: | In general, species diversity decreases as we move away from the equator towards the poles. |
| II: | With very few exceptions, tropics harbour more species than temperate or polar areas. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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