Logistic growth of a population is represented by dN/dt =
1. \(\frac{r N}{K}\)
2. rN
3. \(r N(K+N)\)
4. \(r N \frac{(K-N)}{K}\)
Subtopic: Â Population Dynamic |Â Population: Logistic Growth Model |
 87%
From NCERT
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Given below are two statements:
| Assertion (A): | All the mammals are endotherm. |
| Reason (R): | Mammals possess four chambered heart and respire through lungs |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Study of Aves & Mammals |
 75%
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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 |
 71%
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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 |
 65%
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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
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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 |
 93%
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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 |
 66%
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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 |
 78%
From NCERT
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If you go to the countryside, you often see the 'cattle egret' forage close to where the cattle are grazing. The egret catches insects that flush out from the vegetation due to the moving cattle. The interaction between the egret and cattle is considered as
1. Mutualism
2. Amensalism
3. Competition
4. Commensalism
1. Mutualism
2. Amensalism
3. Competition
4. Commensalism
Subtopic: Â Population Interactions: Commensalism, Protocooperation & Mutualism |
 89%
From NCERT
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