Introduced species can have deleterious effects on biological communities by
1. preying on native species
2. competing with native species for food or light
3. displacing native species
4. All of the options are correct
Subtopic: Â Population Interactions: Competition |
 87%
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Logistic growth of a population is represented by dN/dt =
1. \(\frac{r N}{K}\)
2. rN
3. \(r N(K+N)\)
4. \(r N \frac{(K-N)}{K}\)
1. \(\frac{r N}{K}\)
2. rN
3. \(r N(K+N)\)
4. \(r N \frac{(K-N)}{K}\)
Subtopic: Â Population Dynamic |Â Population: Logistic Growth Model |
 87%
From NCERT
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A:
All the mammals are endotherm.
R: Mammals possess four chambered heart and respire through lungs
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Mammals possess four chambered heart and respire through lungs
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
 73%
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Which of the following are important biotic factors that can affect the structure and organization of biological communities?
1. precipitation, wind
2. nutrient availability, soil pH
3. predation, competition
4. temperature, water
1. precipitation, wind
2. nutrient availability, soil pH
3. predation, competition
4. temperature, water
Subtopic: Â Population Interactions: Competition |Â Population Interactions: Predation |
 69%
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Which statement best describes the evolutionary significance of mutualism?
1. Mutualism offers more biodiversity to a community.
2. Individuals taking Part in a mutualistic relationship are more resistant to parasites.
3. Interaction increases the survival and reproductive rates of mutualistic species.
4. Mutualistic interaction lessens competition in communities where it is present
1. Mutualism offers more biodiversity to a community.
2. Individuals taking Part in a mutualistic relationship are more resistant to parasites.
3. Interaction increases the survival and reproductive rates of mutualistic species.
4. Mutualistic interaction lessens competition in communities where it is present
Subtopic: Â Population Interactions: Commensalism, Protocooperation & Mutualism |
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To withstand the extreme dehydration many invertebrates enter a state known as anhydrobiosis. Which of the following compatible osmolytes accumulate to relatively high levels and protect the organisms against desiccation damage?
1. Ketoses
2. Trehalose
3. Raffinose
4. Stachyose
1. Ketoses
2. Trehalose
3. Raffinose
4. Stachyose
Subtopic: Â Abiotic Factors: Temperature (OLD NCERT) |Â Response of Organisms to Abiotic Factors (OLD NCERT) |Â Adaptations (OLD NCERT) |
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Competition for light, nutrients and space is most severe between
1. Closely related organisms growing in the same niche
2. Closely related organisms growing in the different niche
3. Distantly related organism growing in the same habitat
4. Distantly related organisms growing in the different niches
1. Closely related organisms growing in the same niche
2. Closely related organisms growing in the different niche
3. Distantly related organism growing in the same habitat
4. Distantly related organisms growing in the different niches
Subtopic: Â Introduction to Ecology |
 77%
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While studying the population of rat in a warehouse, you found that average natality was 250, average mortality was 240, immigration was 20 and emigration was 30. What will be the net increase in rat population?
1. 15
2. Zero
3. 10
4. 5
1. 15
2. Zero
3. 10
4. 5
Subtopic: Â Population Characters: Density |
 92%
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An interaction between two living individuals of different species in the same habitat where one does not allow the other to survive, falls under
A. Gause's hypothesis
B. Protocooperation
C. Principle of competitive exclusion
D. Ammensalism
E. Parasitism
Choose the correct answer from the options given below
1. A, C and D only
2. A, B and E only
3. B, C and D only
4. C, D and E only
A. Gause's hypothesis
B. Protocooperation
C. Principle of competitive exclusion
D. Ammensalism
E. Parasitism
Choose the correct answer from the options given below
1. A, C and D only
2. A, B and E only
3. B, C and D only
4. C, D and E only
Subtopic: Â Population Interactions: Competition |
 63%
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Select correct combinations
A. Water Potential = Solute Potential + Pressure Potential
B. Respiratory quotient (RQ) = Volume of CO2 evolved/Volume of consumed CO2
C. DNA
mRNA 
protein
D. Population density at time Nt+1=Nt+[(B+I)-(D+E)]
E. GPP - R =NPP (Net Primary Productivity)
Choose the correct answer from the options given below:
1. A, B, C only
2. C, D, E only
3. A, D, E only
4. A, C, E only
A. Water Potential = Solute Potential + Pressure Potential
B. Respiratory quotient (RQ) = Volume of CO2 evolved/Volume of consumed CO2
C. DNA
mRNA proteinD. Population density at time Nt+1=Nt+[(B+I)-(D+E)]
E. GPP - R =NPP (Net Primary Productivity)
Choose the correct answer from the options given below:
1. A, B, C only
2. C, D, E only
3. A, D, E only
4. A, C, E only
Subtopic: Â Population Characters: Density |Â Population Characters: Natality & Mortality |
 80%
From NCERT
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