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प्रश्न
"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.
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उत्तर
(a) Prey species have evolved various defences to lessen the impact of predation. Some species of insects and frogs are cryptically coloured (camouflaged) to avoid being detected easily by the predator. Some are poisonous and therefore avoided by predators.
(b) (i) The Monarch butterfly is highly distasteful to its predator (bird) because of a special chemical present in its body. Interestingly, the butterfly acquires this chemical during its caterpillar stage by feeding on a poisonous weed.
(b) (ii) Weed Calotropis growing in abandoned fields. The plant produces highly poisonous cardiac glycosides and that is why you never see any cattle or goats browsing on this plant. A wide variety of chemical substances that we extract from plants on a commercial scale (nicotine, caffeine, quinine, strychnine, opium, etc.,) are produced by them actually as defences against grazers and browsers.
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संबंधित प्रश्न
An orchid plant is growing on the branch of a mango tree. How do you describe this interaction between the orchid and the mango tree?
Competition and Mutualism.
Answer the following question.
Mention the term used to describe a population interaction between an orchid growing on a forest tree.
Define Niche.
Using '-' to depict inhibition and '+' to depict benefit, mutualism between two species can be represented as ____________.
Two species competing for the same resources, avoid competition by choosing different times for feeding, also known as ______
Brood parasitism is best explained by the example of ____________.
Which one of the following is NOT an example of mutualism?
Statement I: Gause’s competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely.
Statement II: According to Gause’s principle, during competition, the inferior will be eliminated. This may be true if resources are limiting.
In the light of the above statements, choose the correct answer from the options given below:
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:
