For which of the following animals will thermoregulation be the most energetically expensive?
1. Elephant
2. Humming-bird
3. Rabbit
4. Horse
Subtopic: Â Abiotic Factors: Temperature (OLD NCERT) |
 83%
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To overcome short duration stressful conditions, organism may escape the stressful conditions in time. All the following will be example for this strategy except:
1. Hibernation
2. Aestivation
3. Migration
4. Diapause
1. Hibernation
2. Aestivation
3. Migration
4. Diapause
Subtopic: Â Response of Organisms to Abiotic Factors (OLD NCERT) |
 73%
From NCERT
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Most birds and mammals:
| 1. | breed many times during their lifetime and produce a small number of large-sized offspring. |
| 2. | breed only once during their lifetime and produce a small number of large-sized offspring. |
| 3. | breed many times during their lifetime and produce a large number of small-sized offspring. |
| 4. | breed only once during their lifetime and produce a large number of small-sized offspring. |
Subtopic: Â Life History Variations |
 74%
From NCERT
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Cattle and goats are not seen browsing on Calotropis growing in abandoned fields because:
| 1. | the plant has a large number of thorns. |
| 2. | the plant produces toxic cardiac glycosides. |
| 3. | the plant leaves secrete a lot of distasteful mucilage. |
| 4. | the plant produces secondary metabolite strychnine. |
Subtopic: Â Population Interactions: Predation |
 92%
From NCERT
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In accordance with their lifestyles, parasites evolved special adaptations that do not include:
| 1. | the loss of unnecessary sense organs |
| 2. | presence of adhesive organs or suckers to cling on to the host |
| 3. | loss of digestive system |
| 4. | low reproductive capacity. |
Subtopic: Â Population Interactions: Parasitism |
 86%
From NCERT
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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
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: Â Population Interactions: Commensalism, Protocooperation & Mutualism |
 86%
From NCERT
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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: Â Population: Exponential Growth Model |Â Population: Logistic Growth Model |
 69%
From NCERT
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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: Â Abiotic Factors: Temperature (OLD NCERT) |Â Response of Organisms to Abiotic Factors (OLD NCERT) |
 84%
From NCERT
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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: Â 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: Â Population Interactions: Commensalism, Protocooperation & Mutualism |
 72%
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