Mycorrhiza represents

For a limited resource, two closely related species compete for the same resource, which is known as $.........$, which keeps them in check in the environment.

Which one of the following is $NOT$ an adaptation found in endoparasites?

The phenomenon where organisms resemble other organisms to escape from predators is called .........

$Cuscuta$ is an example of

Which one of the following is most appropriately defined?