Q. No.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
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 |
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 |
Which one of the following organisms reproduces sexually only once in its lifetime?
| 1. | Banana | 2. | Mango |
| 3. | Tomato | 4. | Eucalyptus |
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 |
What will happen to a well-growing herbaceous plant in the forest if it is transplanted outside the forest in a park?
| 1. | It will grow normally |
| 2. | It will grow well because it is planted in the same locality |
| 3. | It may not survive because of changes in its microclimate |
| 4. | It grows very well because the plant gets more sunlight |
Salt concentration (Salinity) of the sea measured in parts per thousand is:
1. 10-15
2. 30-70
3. 0-5
4. 30-35
Biosphere is:
| 1. | A component in the ecosystem |
| 2. | Composed of the plants present in the soil |
| 3. | Life in the outer space |
| 4. | Composed of all living organisms present on earth which interact with the physical environment |
Autecology is the:
| 1. | Relation of heterogeneous populations to their environment |
| 2. | Relation of an individual to its environment |
| 3. | Relation of a community to its environment |
| 4. | Relation of a biome to its environment |
Match plants in Column I with their Ecological adaptations in Column II and select the correct answer from the codes given:
|
|
Plants |
|
Ecological adaptation |
|
A. |
Mangroves |
P. |
High-temperature optima for photosynthesis |
|
B. |
Heliophytes |
Q. |
Deep root systems |
|
C. |
Water hyacinth |
R. |
Viviparity |
|
D. |
Prosopis |
S. |
Inflated petiole |
Codes:
| A | B | C | D | |
| 1. | R | P | S | Q |
| 2. | S | P | R | Q |
| 3. | R | P | Q | S |
| 4. | P | Q | R | S |
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