Q. No.The process of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration is referred as:
| 1. | Association | 2. | Emigration |
| 3. | Competition | 4. | Immigration |
Which of the following is the correct equation of exponential growth?
| 1. | \(N_t = N_0 ~e^{rnt}\) | 2. | \(N_t = N_0 ~e^{rpt}\) |
| 3. | \(N_t = N_0 ~e^{rst}\) | 4. | \(N_t = N_0 ~e^{rt}\) |
A population with finite resources shows a logistic growth curve where the correct sequence of events will be:
| 1. | Stationary phase → Acceleration phase → Lag phase → Asymptote |
| 2. | Acceleration phase → Deceleration → Asymptote |
| 3. | Acceleration phase → Leg phase → Stationary phase |
| 4. | Lag phase → Acceleration phase → Deceleration → Asymptote |
1. feeding at the same time
2. choosing different foraging patterns
3. increasing time spent on attacking each other
4. predating on each other
Mycorrhiza is an example of:
| 1. | Symbiotic relationship | 2. | ectoparasitism |
| 3. | endoparasitism | 4. | decomposers |
The logistic population growth is expressed by the equation:
1. \(\dfrac{dN}{dt} = rn \left(\dfrac{N - K}{N}\right)\)
2. \(\dfrac{dt}{dN} = Nr \left(\dfrac{K - N}{K}\right)\)
3. \(\dfrac{dN}{dt} = rN \left(\dfrac{K - N}{K}\right)\)
4. \(\dfrac{dN}{dt} = rN\)
Gause’s principle of competitive exclusion states that:
| 1. | more abundant species will exclude the less abundant species through competition. |
| 2. | competition for the same resources excludes species having different food preferences. |
| 3. | no two species can occupy the same niche indefinitely for the same limiting resources. |
| 4. | larger organisms exclude smaller ones through competition. |
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20, and emigration 30. The net increase in population is:
| 1. | 10 | 2. | 15 |
| 3. | 5 | 4. | zero |
The population of an insect species shows an explosive increase in number during rainy season followed by its disappearance at the end of the season. What does this show?
| 1. | The population of its predators increases enormously |
| 2. | S-shaped or sigmoid growth of this insect |
| 3. | The food plants mature and die at the end of the rainy season |
| 4. | Its population growth curve is of J-type |
Study the four statements (a-d) given below and select the two correct ones out of them:
| (a) | A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers |
| (b) | Predator starfish pisaster helps in maintaining species diversity of some invertebrates |
| (c) | Predators ultimately lead to the extinction of prey species |
| (d) | Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders |
The two correct statements are:
| 1. | (c) and (d) | 2. | (a) and (d) |
| 3. | (a) and (b) | 4. | (b) and (c) |
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