51.
Which of the following is an example of parasitism?

52.
________ is the interaction in which one species benefits and the other is neither harmed nor benefited.

53.
Consider the following statements
1. Different plant species grow together
2. Light cannot penetrate into the lower strata full of undergrowth
Which of the following type of vegetation is characterized by the above?

54.
It is the branch of biology which deals with the study of relationship between organisms and their environment.

55.
Which of the following is responsible for Vermicomposting?