Irvine Valley College

BIO 1

Quiz 2:

Community ecology and energetics

1)A stage in ecological succession is called a

1. 1. 1. Step
      2. Trophic level
      3. Sere
      4. Link

1. 2. Succession on disturbed habitat is referred to as
      1. Primary
      2. Secondary
      3. Tertiary
      4. Quarternary

1. 3. Approximately              % of the light striking the earth is captured by photosynthetic organisms.
      1. 1%
      2. 5%

C. 10%

D. 90%

1. 4. Unlike energy, nutrients are recycled in the biosphere
      1. True
      2. False

1. 5. The reason why the trophic pyramid is limited to 4 or 5 steps is due to the 2nd Law of Thermodynamics.
      1. True
      2. False

1. 6. The third step (from the bottom) of the trophic pyramid is occupied by the
      1. Primary consumers
      2. Producers
      3. The top predator
      4. Secondary consumers

1. 7. An organism that eats dead organic material is called a(n)
      1. primary consumer
      2. herbivore
      3. secondary consumer
      4. detritovore

1. 8. Which is not true about nutrient cycles?
      1. The are all solar powered
      2. The atmosphere is the primary exchange pool