ماحولیات

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

• 1 50 percent
• 2 100 percent
• 3 10 percent
• 4 90 percent

A relationship in which both organisms benefit is:

• 1 Predation
• 2 Competition
• 3 Mutualism
• 4 Parasitism

Bacteria that convert atmospheric nitrogen into ammonia are called:

• 1 Photosynthetic bacteria
• 2 Pathogens
• 3 Nitrogen fixing bacteria
• 4 Decomposers

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

• 1 Ecosystem
• 2 Population
• 3 Biome
• 4 Community

Ecological succession starting on bare rock is called:

• 1 Migration
• 2 Secondary succession
• 3 Primary succession
• 4 Climax

The nitrogen in the air is converted to nitrates by:

• 1 Animals
• 2 Plants
• 3 Bacteria
• 4 Fungi only

The ozone layer is found in the:

• 1 Troposphere
• 2 Stratosphere
• 3 Thermosphere
• 4 Mesosphere

A pyramid of numbers shows the:

• 1 Soil layers
• 2 Energy only
• 3 Biomass only
• 4 Number of organisms at each trophic level