true and false

1 Plants can only use 10% of the sun's energy
2 Energy in an ecosystem cannot be recyled
3 Tie movement of nitrogen in an ecosytem is the slowest among the nutrients in the biogeochemical cycle
4 The main reservoir of phosphorus is the atmosphere
5 The nitrogen-fixing bacteria change nitrogen gas into ammonium
6 Rhizobium is a kind of bacteria found in the nodules of legume plants
7 Carbon dioxide is one of the greenhouse gases that warm the earth
8 Organisms can take and use nitrogen in air
9 Eutrophication happens when water has excess nutrients
10 The organisms serve as the reservoir of the chemicals in the biogechemical cycle​