The prickly pear cactus when introduced into Australia in the early 1920's caused havoc by . spreading rapidly into millions of hectares of rangeland because
1. The soil of invaded land was fertile for cactus.
2. It was cultivated for its economic importance
3. The invaded land did not have its natural predators
4 It was not eaten by humans but by animals only
Subtopic: Â Population Interactions: Predation |
 91%
From NCERT
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Which of the following algae are found most abundantly at shallowest and greatest depth of sea water respectively?
1. Red algae and green algae
2. Red algae and flrown algae
3. Green algae and red algae
4. Brown algae and red algae
1. Red algae and green algae
2. Red algae and flrown algae
3. Green algae and red algae
4. Brown algae and red algae
Subtopic: Â Abiotic Factors: Light & Water (OLD NCERT) |
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In a population interaction, any of the species is not benefited in any way. This interaction may be
1. Mutualism
2. Commensalism
3. Amensalism
4. Parasitism
1. Mutualism
2. Commensalism
3. Amensalism
4. Parasitism
Subtopic: Â Population Interactions: Amensalism |
 81%
From NCERT
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When the competing superior species is experimentally removed then the other species expands its distributional range. This is proved by
| 1. | Removal of fish from sea led to dominate sea anemone |
| 2. | Removal of cattle egrets led barnacles to grow enormously |
| 3. | Removal of warblers from trees led to increase in frugivorous birds. |
| 4. | Removal of Balanus led Chathamalus to expand |
Subtopic: Â Population Interactions: Predation |
 74%
From NCERT
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A variety of chemical substances that we extract from plants on a commercial scale such as nicotine, caffeine, opium etc. are produced by them actually
1. To increase the economic value
2. To make themselves poisonous
3. As defense against grazers and browsers
4. As metabolic regulators
1. To increase the economic value
2. To make themselves poisonous
3. As defense against grazers and browsers
4. As metabolic regulators
Subtopic: Â Population Interactions: Predation |
 86%
From NCERT
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Read the following statements and select the correct option.
1. Only statement A is correct
2. Only statement B is correct
3. Both statements are correct
4. Both statements are incorrect
| A: | Temperature plays an important role in both latitudinal and altitudinal distribution of organisms. |
| B: | Mango is tropical and subtropical tree plant. |
1. Only statement A is correct
2. Only statement B is correct
3. Both statements are correct
4. Both statements are incorrect
Subtopic: Â Abiotic Factors: Temperature (OLD NCERT) |
 72%
From NCERT
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All of the following show predator-prey relationship, except
1. Tiger and Deer
2. Sparrow and Seeds
3. Herbivores and plants
4 Algae and fungi in lichens
1. Tiger and Deer
2. Sparrow and Seeds
3. Herbivores and plants
4 Algae and fungi in lichens
Subtopic: Â Population Interactions: Predation |Â Population Interactions: Commensalism, Protocooperation & Mutualism |
 86%
From NCERT
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State true (T) or false (F) for the following statements and select the correct option.
A. Logistic growth curve shows asymptote when the population density reaches the carrying capacity.
B. Logistic growth model is more realistic one.
A. Logistic growth curve shows asymptote when the population density reaches the carrying capacity.
B. Logistic growth model is more realistic one.
| A | B | |
| 1. | T | T |
| 2. | T | F |
| 3. | F | T |
| 4. | F | F |
Subtopic: Â Population: Logistic Growth Model |
 91%
From NCERT
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In nature, a given habitat has enough resources to support a maximum possible number, beyond which no growth is possible. This natural limit for that species in that habitat is called
1. Biotic potential
2. Environmental resistance
3. Natality
4. Carrying capacity
1. Biotic potential
2. Environmental resistance
3. Natality
4. Carrying capacity
Subtopic: Â Population: Logistic Growth Model |
 81%
From NCERT
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Select the incorrect.one about logistic growth
1. Resources are limiting in the environment.
2. Species cannot grow beyond carrying capacity
3. Organisms always show exponential growth.
4. Population growth is represented by a sigmoid curve.
1. Resources are limiting in the environment.
2. Species cannot grow beyond carrying capacity
3. Organisms always show exponential growth.
4. Population growth is represented by a sigmoid curve.
Subtopic: Â Population: Logistic Growth Model |
 84%
From NCERT
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