Exam 3: Energy Flows and Ecosystems

The "weakest link" in a food chain is ________.

________ and ________ account for 99 per cent of the gaseous volume of the troposphere.

Constant bombardment of early Earth's nutrient-rich seas by solar energy creates ________.

Approximately ________ of energy is lost as it is converted from solar energy to chemical energy stored in producers as biomass.

Decomposer food chains, rather than grazing food chains, often dominate forest ecosystems.

Not all ecosystems have the same ability to fix biomass.

All plants are autotrophs.

Chemoautotrophs and phototrophs are both ________.

Biodiversity hotspots are areas where biodiversity is severely at risk.

What is a keystone species? Why are keystone species so important in ecosystems? Provide an example of a Canadian keystone species.

The approach used by Indigenous peoples to develop knowledge is referred to as ________.

Photosynthesis requires ________.

Mutualism is a relationship which is ________.

Phototrophs obtain their energy from ________.