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प्रश्न
Define Niche.
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उत्तर
Niche describes the position of a species in an environment and also the functional role played by an organism.
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संबंधित प्रश्न
Distinguish between the following: Parasitism and Mutualism.
With the help of a suitable diagram, describe the logistic population growth curve.
The cattle egret and grazing cattle in close association is a classic example of ______.
Define population growth. Explain different types of age pyramids.
Statement I: If one or two species are lost, it may not affect proper functioning of ecosystem.
Statement II: Loss of key species causes serious threat to functioning of ecosystem. Choose the correct alternative with reference to the above statements
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?
Define stenohaline species.
In a pond, we see plants which are free-floating; rooted–submerged; rooted emergent; rooted with floating leaves; Write the type of plant against the following examples.
| Plant Name | Type | |
| a. | Hydrilla | ______ |
| b. | Typha | ______ |
| c. | Nymphaea | ______ |
| d. | Lemna | ______ |
| e. | Vallisneria | ______ |
In an association of two animal species, one is a termite which feeds on wood and the other is a protozoan Trichonympha present in the gut of the termite. What type of association they establish?
Give one example for the following type.
Predator animal
Give one example for the following type.
Phytophagous animal
Pick out the appropriate association representing brood parasitism.
The interaction between cattle egret and the buffalo is ______.
Many copepods live on the body surface of marine fish. This relationship is an example of ______.
In which interaction of species, both the species are at a loss?
The diagram given below shows the life cycle of a malarial parasite. Study it carefully and answer the questions that follows:
- Name the hosts in which the asexual phase and sexual phase of the life cycle takes place.
- Identify the infective stage labelled ‘D’.
- Name the structure labelled ‘A’ and ‘E’.
- Give any one symptom of malaria.
Statement I: Gause’s ‘Competitive Exclusion Principle states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement II: In general, carnivores are more adversely affected by competition than herbivores.
In the light of the above statements, choose the correct answer from the options given below:
Cuscuta growing on a host plant is an example of which population interaction?
What is the sign convention for commensalism?
Tall plants blocking sunlight for smaller nearby plants is an example of which population interaction?
