Which of the following is not an example of commensalism?
1. An orchid growing as an epiphyte on a mango branch
2. Barnacles growing on the back of a whale
3. Cuckoo laying eggs in the nests of crow
4. Clown fish living among the tentacles of sea anemone
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
86%
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If N is the population size, r is the intrinsic growth rate, K is the carrying capacity of the local environment, and dN/dt is the rate of change in population with time, then the Verhulst-Pearl Logistic growth equation is correctly written as:
| 1. | dN/dt = rN[1- N/K] | 2. | dN/dt = rN[1- K/N] |
| 3. | dN/dt = rN + [1- N/K] | 4. | dN/dt = rN + [1- K/N] |
Subtopic: Population: Exponential Growth Model | Population: Logistic Growth Model |
69%
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Thermoregulation is likely to be energetically most expensive for:
1. Blue whale
2. Humans
3. Humming birds
4. Elephant
1. Blue whale
2. Humans
3. Humming birds
4. Elephant
Subtopic: Abiotic Factors: Temperature (OLD NCERT) | Response of Organisms to Abiotic Factors (OLD NCERT) |
84%
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In ‘competitive release’:
| 1. | differences among similar species whose distributions overlap geographically are accentuated in regions where the species co-occur, but are minimized or lost where the species' distributions do not overlap. |
| 2. | two species which compete for the same limited resource cannot coexist at constant population values. |
| 3. | there is an expansion of the range of a species when a competitor for its niche is removed. |
| 4. | there is a division of limited resources by species to help avoid competition in an ecological niche. |
Subtopic: Population Interactions: Predation |
From NCERT
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Identify the option where the relationship between given organisms is correctly described:
| 1. | Flamingoes visiting American lakes and resident fishes: Commensalism |
| 2. | Yucca plant and Tegeticula yuccasella, the yucca moth: Mutualism |
| 3. | Female Anopheles and humans: Parasitism |
| 4. | Lichens: Predation |
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
72%
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If you draw the age pyramid for a population that is expanding in size, you would expect that:
| 1. | the number of individuals in the pre-reproductive age group are more than the number of individuals in the reproductive age group. |
| 2. | the number of individuals in the reproductive age group are less than the number of individuals in the post-reproductive age group. |
| 3. | the number of individuals in the reproductive age group are equal to the number of individuals in the reproductive age group. |
| 4. | the number of individuals in the pre-reproductive age group are less than the number of individuals in the reproductive age group. |
Subtopic: Age Pyramid |
86%
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Which one of the following statements cannot be connected to Predation?
| 1. | It is necessitated by nature to maintain the ecological balance . |
| 2. | It helps in maintaining species diversity in a community. |
| 3. | It might lead to the extinction of a species. |
| 4. | Both the interacting species are negatively impacted. |
Subtopic: Population Interactions: Predation |
77%
From NCERT
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While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (–) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (–) for another species involved in the interaction?
1. Competition
2. Predation
3. Amensalism
4. Commensalism
Subtopic: Population Interactions: Predation |
89%
From NCERT
NEET - 2022
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If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ___________ individuals per Drosophila per week.
1. zero
2. 0.1
3. 10
4. 1.0
1. zero
2. 0.1
3. 10
4. 1.0
Subtopic: Population Attributes |
80%
From NCERT
NEET - 2022
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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
Subtopic: Population Characters: Age Structure & Migration |
86%
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NEET - 2022
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