Question

1. Most species exhibit exponential growth（T or F）

2. If the net primary productivity of a small cornfield is 100,000 calories per square meter per year in a growing
season, then the annual net productivity of predator confined to eating the insect pests of com would be
approximately_?_ calories/m2/year.

a.) 90,000 b.) 25,000 c.) 10,000 d) 1,000 e.) 100

3. What is a community?
a.) all the individuals of a species that live together in a habitat
b.) all niches together
c.) all the species that live together in a habitat
d.) only humans live in communities

Answer 1

1. False statement. Most species exhibit logistic growth as the resources are finite in amount whereas while exhibiting exponential growth assumes that there is infinite amount of resources which is not a realistic scenario.

2. D is the right answer. According to the 10 per cent rule, the pest would get 10,000cal/m2/year whereas the predator which feeds on the pest would get only 1,000 cal/m2/year according to the same rule. The ten percent rule states that there is only 10 percent efficiency in transfer of energy from one tropic level to another.

3. C is the right answer. A community is a ecosystem where all the species co-exist together in a habitat and utilise same resources.

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