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Ecology

Class 12 · Biology · 5 questions

Name: ____________________   Date: ____________

  1. Only about what percentage of energy passes to the next trophic level?

    • A 50 percent
    • B 100 percent
    • C 10 percent
    • D 90 percent

  2. A relationship in which both organisms benefit is:

    • A Predation
    • B Competition
    • C Mutualism
    • D Parasitism

  3. Bacteria that convert atmospheric nitrogen into ammonia are called:

    • A Photosynthetic bacteria
    • B Pathogens
    • C Nitrogen fixing bacteria
    • D Decomposers

  4. A group of organisms of the same species in an area is a:

    • A Ecosystem
    • B Population
    • C Biome
    • D Community

  5. Ecological succession starting on bare rock is called:

    • A Migration
    • B Secondary succession
    • C Primary succession
    • D Climax

Answer key

1. C, 2. C, 3. C, 4. B, 5. C

  1. About 10 percent is a standard estimate.

  2. Both partners gain.

  3. Rhizobium in root nodules is an example.

  4. A population is a group of the same species.

  5. Primary succession starts where no soil exists.