Q. No.Lichens are association of:
1.
Bacteria and fungus
2.
Alga and bacterium
3.
Fungus and alga
4.
Fungus and virus
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Which of the following is a partial root parasite?
1. Sandalwood
2. Mistletoe
3. Orobanche
4. Ganoderma
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Which one of the following organisms reproduces sexually only once in its lifetime?
| 1. | Banana | 2. | Mango |
| 3. | Tomato | 4. | Eucalyptus |
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Amensalism is an association between two species where:
1. One species is harmed and the other is benefitted
2. One species is harmed and the other is unaffected
3. One species is benefitted and the other is unaffected
4. Both species are harmed
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In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using the exponential equation, the number of people present in 2015 is predicted as:
| 1. | 25 million | 2. | 17 million |
| 3. | 20 million | 4. | 18 million |
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A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?
| 1. | 128 | 2. | 24 |
| 3. | 64 | 4. | 32 |
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Which of the following would necessarily decrease the density of a population in a given habitat?
| 1. | Natality> mortality | 2. | Immigration >emigration |
| 3. | Mortality and emigration | 4. | Natality and immigration |
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What parameters are used for the tiger census in our country’s national parks and sanctuaries?
| 1. | Pug marks only | 2. | Pugmarks and fecal pellets |
| 3. | Faecal pellets only | 4. | Actual headcounts |
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A population has more young individuals compared to older individuals. What would be the status of the population after some years?
1. It will decline
2. It will stabilize
3. It will increase
4. It will first decline and then stabilize
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If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the percent growth or birth rate per individual per hour?
| 1. | 100 | 2. | 200 |
| 3. | 50 | 4. | 150 |
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