Competition for light, nutrients and space is most severe between

The principle of competitive exclusion was stated by

Examples of chemicals produced by plants as a defense against grazers and browsers

$I.$ Nicotine

$II.$ Caffeine

$III.$ Quinine

$IV.$ Strychnine

$V.$ Opium

Choose the correct combination

Given below are two statements:

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:

When the organisms live together in such a manner that one organism is benifitted, while other has no effects, it is called

Define ectoparasite and endoparasite and give suitable examples.