In mycorrhiza, the fungi help the plant in:
1. Synthesis of high energy carbohydrates
2. Absorption of essential nutrients from the soil
3. Nitrogen fixation
4. Biocontrol of pathogens

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
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The fig tree is pollinated by a:

1. Honeybee 2. Wasp
3. Bird 4. Moth
Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
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To get pollinated by a bee, the Mediterranean Orchid, Ophrys, employs:
1. Sexual deceit
2. Pseudo-copulation
3. Reward in the form of nectar
4. Place for laying eggs

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
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Not all parasitism involves feeding on the body of the host. The exception is:
1. ectoparasitism
2. endoparasitism
3. parasitoids
4. brood parasitism

Subtopic:  Population Interactions: Parasitism |
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A feature of ‘r’ strategists would be:

1.few offspring2.little parental care
3.sigmoid growth curves4.a longer generation time

Subtopic:  Population Dynamic |

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The maximum population size of the species that the environment can sustain indefinitely is called as:

1.biotic potential2.natality
3.environmental resistance4.carrying capacity

Subtopic:  Population Dynamic |
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A community of living organisms in conjunction with the nonliving components of their environment, interacting as a system is termed:

1.  ecosystem 2.  species
3.  biome 4.  population
Subtopic:  Introduction to Ecology |
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The threat of extinction will be highest for:

1.  a very small population in an unstable environment
2.  a moderate-sized population of r strategists
3.  a large population with lots of genetic variabilities
4.  a moderate sized population in a stable environment

Subtopic:  Response of Organisms to Abiotic Factors (OLD NCERT) |
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During logistic growth, the sigmoid curve will level off when:
1. the population stops reproducing
2. the population starts reproducing asexually
3. the population reaches the environmental carrying capacity
4. sigmoid growth curves never levels off

Subtopic:  Population: Logistic Growth Model |
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A population with a population pyramid that has an extremely broad base will most likely be:

1. a rapidly expanding population
2. a stable population
3. a population where the birth rate equaled the death rate
4. a population where there were more old than young individuals

Subtopic:  Population Dynamic |
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