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Water Quality Set #2
Fill in the blank statements
| Question | Answer |
|---|---|
| Too many ______ /phosphates cause an explosion of ______ growth in the water Blocks ______ from getting to the plants in the water. Plants at the bottom do not get sunlight and will die Bacteria break them down which makes the _____ levels in the water _______ further causing fish and other animals to die. | nitrates; algae; sunlight; DO; decrease |
| 2 main chemicals found in fertilizer | nitrates & phosphates |
| 3 factors that affect dissolved oxygen levels | 1. temperature of water 2. amount of water movement 3. decay of once living organisms |
| The more turbulent the water, the ________ the amount of D.O. it will have | higher |
| ________ water can hold more dissolved oxygen than ________ water | Colder; warmer |
| A water body with an algal bloom will eventually have very low levels of dissolved oxygen, because... | when bacteria decompose dead plants and animals, the bacteria uses up available oxygen |
| temperature can change the water quality in what 2 ways 1. the amount of D.O. in the water 2. the rate of photosynthesis. | |
| Temperatures that are too high or too low can stress an organism. This stress makes organisms more prone to _________ & makes it more difficult for them to react to __________. | disease; pollution. |
| The murkier the water, the __________ the turbidity. | greater |
| _____________ can be used to measure turbidity. The instrument is lowered and raised in the water. A depth reading is taken at the point where the ______________ disappears and reappears. | Secchi disk; Secchi disk |
| 3 factors that can cause turbid water | 1. soil erosion 2. urban runoff 3. bottom sediment disturbances. |
| Oxygen dissolves into water from two sources: | 1. the atmosphere 2. plants in the water. |
| The primary source of oxygen for a pond is Normal pH range for healthy watersheds 6.5-8.5 | photosynthesizing microscopic algae (phytoplankton) or submerged plants. |
| Normal pH range for healthy watersheds | 6.5-8.5 |
| Humans an increase the pH of the water in ecosystems by: | Acid rain, burning fossil fuels, industrial pollution, mining |
| Increased turbidity blocks _______ from reaching plants on the bottom of water causing the _______ to decrease since the plants cannot ________ | sunlight; DO; photosynthesize |
| The colder the temperature of the water, the _______ oxygen can be dissolved in it. The ________ moving molecules in warm water causes the ______ to evaporate more easily | more; faster; DO |
| pH can affect how well certain chemicals will _____ in water. Metals are more _____ to a body of water when the pH is ____ | dissolve; toxic; lower |
| Burning ________causes sulfur and nitrogen ______ to form. They react with the ________ in the air to form acids found in ______ | fossil fuels; dioxides; water & oxygen; acid rain |
Created by:
jhandy8
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