Fill in the blanks:Complete the following sentences by filling suitable words. 1. Profundal Zone beneath the __ zone where there is insufficient light for photosynthesis 2. After a heavy rain the water table will be __ (close to the surface) 3. As plants and animals __ , their remains sink to the bottom of the water 4. There are two kinds of lakes Oligotrophic and __ 5. In __ lakes, often the water is murky (cloudy) because favourable abiotic factors lead to high numbers of organisms 6. In winter often lakes covered in ice and snow, preventing atmospheric __ from dissolving with the water 7. Human sewage, animal wastes, decaying plant life , industrial waste (ex. Pulp mills) are the sources of organic solid wastes and it causes water __ . 8. The greater the amount of decaying matter,the greater the population of __ 9. Many pollutants from __ and aquatic ecosystems are carried to the oceans, where they spread out and become more diluted 10. All oils eventually enter the __ of fish, birds and Fayaz.panhwer@tsec.ca 2

1. Profundal Zone beneath the **limnetic** zone where there is insufficient light for photosynthesis.<br /><br />2. After a heavy rain, the water table will be **high** (close to the surface).<br /><br />3. As plants and animals **die**, their remains sink to the bottom of the water.<br /><br />4. There are two kinds of lakes: Oligotrophic and **Eutrophic**.<br /><br />5. In **eutrophic** lakes, often the water is murky (cloudy) because favorable abiotic factors lead to high numbers of organisms.<br /><br />6. In winter, often lakes are covered in ice and snow, preventing atmospheric **oxygen** from dissolving in the water.<br /><br />7. Human sewage, animal wastes, decaying plant life, industrial waste (ex. Pulp mills) are the sources of organic solid wastes, and this causes water **pollution**.<br /><br />8. The greater the amount of decaying matter, the greater the population of **decomposers** (or bacteria).<br /><br />9. Many pollutants from **terrestrial** and aquatic ecosystems are carried to the oceans, where they spread out and become more diluted.<br /><br />10. All oils eventually enter the **tissues** (or bodies) of fish, birds, and other organisms.<br />