This document appears to be a quiz on freshwater habitats and lake ecology. It includes questions to identify different types of freshwater habitats, multiple choice questions to classify different kinds of lakes based on their nutrient levels and productivity, and essay questions to define lake layer terminology and discuss the annual lake cycle. The quiz covers topics like flowing vs. still freshwater, the percentage of earth covered by freshwater habitats, and the study of freshwater ecology. It aims to test understanding of lake nutrient levels, visibility, oxygen levels, algal density, and the stratification of lakes into layers with temperature changes.

1. GEN. ECOLOGY
Name _________________ SCORE ___________
Course/Year ____________ DATE ____________
FRESHWATER HABITAT
Quiz no._____
IDENTIFICATION: (1 point each)
_____________1. Types of freshwater habitats that is washed or the running water refers to
flowing water.
_____________2. It is defined as having a low salt concentration and is usually less than 1%.
_____________3. How many percent of freshwater habitats on the earth surface?
_____________4. Calm freshwater habitat or standing water refers to standing or relatively still
water.
_____________5. It is the study of freshwater Habitats.
Multiple choice: Write the letter of the correct answer before the number.
________1.). Lakes with an intermediate level of productivity, these lakes are commonly clear
water lakes and ponds with beds of submerged aquatic plants and medium level of
nutrients.
A. Hypereutrophic lake B. Mesotrophic lake C. Eutrophic lake D. Oligotrophic lake
________2.) Bodies of water which are characterized with low algal nutrients (such as nitrate or
phosphate) and low in the amount of algal material per unit of volume.
A. Hypereutrophic lake B. Mesotrophic lake C. Eutrophic lake D. Oligotrophic lake
________3.). Type of lake which is rich in nutrients rich lakes and severe nuisance algal
blooms and low transparency. Have visibility depth of less than 3 feet.
A. Hypereutrophic lake B. Mesotrophic lake C. Eutrophic lake D. Oligotrophic lake

2. _______4.)Bodies of water are high in algal nutrients and often populated densely with algal.
They are more likely to be low in dissolved oxygen especially in summer.
A. Hypereutrophic lake B. Mesotrophic lake C. Eutrophic lake D. Oligotrophic lake
Essay:
1. Differentiate the following terminologies: (2 pts each)
Epilimnion -
Hypolimnion -
Thermocline -
2. Briefly discuss the annual lake cycle. (5 pts.)