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Substantiate by giving two reasons as to why a holistic understanding of the flora and fauna the cropland is required before introducing an appropriate biocontrol method.
Concept: Population Interactions
With the decline in the population of fig species it was noticed that the population of wasp species also started to decline. What is the relationship between the two and what could be the possible reason for decline of wasps?
Concept: Population Interactions
What is mycorrhiza?
Concept: Population Interactions
Sea Anemone gets attached to the surface of the hermit crab. The kind of population interaction exhibited in this case is ______.
Concept: Population Interactions
Write the observations made at the end of Connell's field, experiment on barnacles on the rocky sea coasts of Scotland.
Concept: Population Interactions
Name any two categories of organisms that in general are adversely affected by competition.
Concept: Population Interactions
What would be the best method to measure the total population density of the number of fishes in river and why?
Concept: Population and Population Attributes >> Life History Variation
Interaction between clown fish living among the stinging tentacles of sea anemone is an example of ______.
Concept: Population Interactions
"Abingdon tortoise in Galapagos islands became extinct within a decade on introduction of goats in the island." Explain giving reason.
Concept: Population Interactions
Many copepods live on the body surface of marine fish. This relationship is an example of ______.
Concept: Population Interactions
"Some species of insects and frogs have evolved with various specific features that help them from being detected."
- Justify the statement giving reasons.
- Mention any two such features.
Concept: Population Interactions
Observe the graph given below.
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The graph represents inter-specific interaction between two species of Paramecia competing for the same resource in a culture medium. Paramecium caudatum and Paramecium aurelia were grown in separate cultures as well as in mixed cultures. It was found that each species grew in numbers according to the logistic equation.
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a) Which species is competitively superior? Support it with the data provided in the graph.
b) State the underlying principle for the above result and name the scientist associated with this principle.
c) Explain the mechanism in which two or more species competing with each other can co-exist.
OR
Graphs A and B shown below depict interaction of two species. Which graph indicates Mutualism? Give reason.
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| A | B |
Concept: Population Interactions
Write the equation that helps in deriving the net primary productivity of an ecosystem.
Concept: Concept of Ecosystem >> Productivity
Why the pyramid of energy is always upright? Explain.
Concept: Ecological Pyramids
“The pyramid of biomass is not always upright.” Explain the statement.
Concept: Ecological Pyramids
Name the type of detritus that decomposes faster. List any two factors that enhance the rate of decomposition.
Concept: Concept of Ecosystem >> Decomposition
Write the different steps taken in humification and mineralisation during the process of decomposition.
Concept: Concept of Ecosystem >> Decomposition
Answer the following question.
Describe the inter-relationship between productivity, gross primary productivity, and net productivity.
Concept: Concept of Ecosystem >> Productivity
Answer the following question.
What is an ecological pyramid? Compare the pyramids of energy, biomass, and numbers.
Concept: Ecological Pyramids
Write the relationship between productivity, gross primary productivity, net primary productivity, and secondary productivity.
Concept: Concept of Ecosystem >> Productivity
