Barnacles growing on the back of a whale is an example of .........

$A$ high density of elephant population in an area can result in

Which one of the following is categorised as a parasite in the true sense?

Study the four statements $(i-iv)$ given below and select the two correct ones out of them.
$(i)$ $A$ lion eating a deer and a sparrow feeding on grains are ecologically similar in being consumers.
$(ii)$ Predator star fish $Pisaster$ helps in maintaining species diversity of some invertebrates.
$(iii)$ Predators ultimately lead to the extinction of prey species.
$(iv)$ Production of chemicals such as nicotine,strychnine by the plants are metabolic disorders.
The two correct statements are

Name the term used to describe a single dominant species that dictates community structure.

Which one of the following statements cannot be connected to Predation?