Give reasons for 5 stars! The figure below represents the interaction web of fis
ID: 49774 • Letter: G
Question
Give reasons for 5 stars!
The figure below represents the interaction web of fish, insects, and plants in an ecosystem. Solid lines denote direct interactions, whereas dotted lines denote indirect interactions; the direction of the arrow shows the direction of the interaction; and the sign (+/0/-) denotes the effect of the interaction. Answer the following questions:
1. The direct interaction between fish and larval dragonfly leads to a(n) __________ in larval dragonfly density with an increase in fish.
A) increase
B) decrease
C) no change
D) cannot be determined
2. The direct interaction between larval dragonfly and dragonfly leads to a(n) __________ in dragonfly density with an increase in larval dragonfly.
A) increase
B) decrease
C) no change
D) cannot be determined
3. The indirect interaction between fish and dragonfly leads to a(n) __________ in dragonfly density with an increase in fish.
A) increase
B) decrease
C) no change
D) cannot be determined
4. The indirect interaction between fish and pollinator leads to a(n) __________ in pollinator density with an increase in fish.
A) increase
B) decrease
C) no change
D) cannot be determined
5. The indirect interaction between fish and plants leads to a(n) __________ in plant density with an increase in fish.
A) increase
B) decrease
C) no change
D) cannot be determined
Explanation / Answer
Answer 1 b) decrease
Reason - because in this case, fishes feed on the dragonfly larvae, and the increase in fish numbers will feed on more number of dragonfly larvae and decreasing the density of dragonfly larvae.
Answer 2 a) Increase
Reason - Dragonfly larvae develop into the mature dragonfly. therefore, increase in a number of dragonfly larvae will give rise to more number of the mature dragonfly.
Answer 3 b) decrease
Reason - As we see that fishes feed on dragonfly larvae and dragonfly larvae develop into the mature dragonfly. therefore, increase in a number of fishes will decrease the number of larvae and it would result in a decrease in the number of the mature dragonfly as well.
Answer 4 a) Increase
Reason - As we see above that increase in a number of fishes will decrease the dragonfly numbers. also, we see that dragonfly feed on pollinators and decreasing their number. but, in the case of increasing fish nuk=mber will result in decreasing dragonfly and more pollinators are survived from dragonfly predation.
Answer 5 a) increase
Reason- As we reasoned above that increase in fish number will result in more density of pollinators. therefore, more plants will be pollinated from increased pollinators and this will increase the plant density in that area.
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