Question

What would happen if the population of the bird species shown in the ecosystem in Figure 4-1 were to suddenly decrease?

•The grass population would increase
•The fish population would increase
•The fish would occupy the bird's niche
•The grass and fish would compete for resources

Answer 1

The second option which is, "The grass population will increase" is the correct option.

Step-by-step explanation:

• In the above picture, a bird is eating a fish from the pond. if the population of birds in a community decrease due to some reasons, then there will be no birds for eating fishes.
• This will cause an increase in the population of fishes.
• But there is no connection of grass with the increase and decrease of birds species.
• In ecological pyramids, Birds (secondary consumers) are high than the fishes (primary consumers).
• As secondary consumers eat primary consumers.
• Hence the decrease in secondary consumers will increase the population of primary consumers.

Answer 2

Answer: The fish population would increase.

This is because if the number of birds decrease the number of fishes would automatically increase as there would be less birds to eat the fishes.

According to trophic pyramid if the number of species at higher tropic level decreases the number of species at lower trophic level increases

• Rest all the options has no interconnections like grass has nothing to do with the fishes and birds as well

• Fishes cannot occupy bird's niches because both the niches are different

• The grass and fish cannot compete for resources because their resources are different