NEET UG 2022 — Organisms and Populations

While explaining interspecific interaction of population, $(+)$ sign is assigned for beneficial interaction, $(-)$ sign is assigned for detrimental interaction and $(0)$ for neutral interaction. Which of the following interactions can be assigned $(+)$ for one species and $(-)$ for another species involved in the interaction?

If '$8$' Drosophila in a laboratory population of '$80$' died during a week, the death rate in the population is ____ individuals per Drosophila per week.

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

Frugivorous birds are found in large numbers in tropical forests mainly because of :

The species that come to appear in bare area are called :

Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together, they may avoid competition in the same garden by: