Science 1/28 Bell Ringer

How do abiotic and biotic factors interact in an ecosystem to affect plant populations?

• Only biotic factors influence plant growth

• Abiotic factors have no effect on plant populations

• Both factors work independently without interaction

• Both factors work together to determine plant survival and growth

What is the primary reason organisms compete for resources in an ecosystem?

• To establish dominance over other species

• Because resources are unlimited

• Because essential resources are limited

• To create more biodiversity

In an energy pyramid, why does energy decrease as it moves up trophic levels?

• Energy is created at each level

• Energy is used for life processes and lost as heat

• Predators don't need as much energy

• Energy is stored equally at all levels

(a)   enhances resilience against disturbances, leading to greater ecosystem stability.

• Lower biodiversity
• Energy levels
• Higher biodiversity
• Primary consumers

What is the key difference between primary and secondary succession?

• Primary succession occurs only in water

• Secondary succession requires no soil

• Primary succession begins on bare rock while secondary starts with existing soil

• Secondary succession only occurs after fires

How does a decrease in producer populations affect an ecosystem's energy flow?

• It has no effect on other trophic levels

• It increases energy at higher trophic levels

• It reduces available energy for all consumers

• It only affects decomposers

What percentage of energy typically transfers between trophic levels?

• 10%

• 25%

• 50%

• 75%

Which factor would most likely trigger secondary succession?

• A new volcanic island formation

• A forest fire

• The creation of bare rock

• The formation of a new glacier

(a)   contribute to primary succession by creating soil and breaking down rock.

• Pioneer species
• They consume other organisms
• They only provide food for herbivor
• They eliminate competition

Biodiversity plays a role in making ecosystems (a)   in response to environmental changes.

• It makes ecosystems more vulnerable
• It has no effect on ecosystem respo
• It makes ecosystems more resilient
• It decreases ecosystem stability