Ecology

Written by Dr. Hira Salman (Biology)

Class 12 · Biology · 8 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

6. The nitrogen in the air is converted to nitrates by:

   • A Animals
   • B Plants
   • C Bacteria
   • D Fungi only

7. The ozone layer is found in the:

   • A Troposphere
   • B Stratosphere
   • C Thermosphere
   • D Mesosphere

8. A pyramid of numbers shows the:

   • A Soil layers
   • B Energy only
   • C Biomass only
   • D Number of organisms at each trophic level