MYP Biology Ecosystem Cycles Questionbank

Both energy and matter cycle continuously through the environment

Energy cycles through organisms while matter flows in one direction

Matter flows in one direction and is lost to space while energy is recycled

Energy flows in one direction and is lost as heat, while matter cycles

The algae use up all the dissolved carbon dioxide

Fish use up the oxygen trying to eat the excess algae

Decomposers use up dissolved oxygen while breaking down dead algae

The algae produce toxic levels of nitrogen gas

Because the planet receives almost no new matter from external sources

Because matter is eventually converted into heat and lost to space

Because decomposers destroy elements during the breakdown of waste

Because Earth receives a constant influx of new matter from sunlight

phospholipids

polysaccharides

triglycerides

amino acids