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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
Select the statement which explains best parasitism.
Select the statement which explains the best parasitism.
Define population.
What is commensalism? Explain it with a suitable example.
Tabulate and analysis of two species population interaction.
Define ectoparasite and endoparasite and give suitable examples.
Sea Anemone gets attached to the surface of the hermit crab. The kind of population interaction exhibited in this case is ______.
Match the Column I with Column II.
| Column I | Column II |
| A. Lichen | (i) Commensalism |
| B. Shark and Pilot fish | (ii) Mutualism |
| C. Barnacles on the back of a whale | (iii) Symbiotic obligatory relationship |
| D. Sharks and dolphins | (iv) Competition |
A bird laying its egg in the nest of another bird is the type of ______.
Observe the graph given below.
|
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.
|
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.
 |
 |
| A | B |
