{"id":1588,"date":"2018-01-02T11:32:47","date_gmt":"2018-01-02T16:32:47","guid":{"rendered":"http:\/\/www.horizon-research.com\/ASSET\/?page_id=1588"},"modified":"2019-04-15T16:15:23","modified_gmt":"2019-04-15T20:15:23","slug":"student-experience-3-what-happens-when-nutrients-are-added-to-pond-water","status":"publish","type":"page","link":"https:\/\/www.horizon-research.com\/ASSET\/getting-started-interdependence\/driving-question-pathway-the-mystery-at-sunrise-farm-pond\/the-mystery-at-sunrise-farm-pond-part-one\/student-experience-3-what-happens-when-nutrients-are-added-to-pond-water\/","title":{"rendered":"Student Experience 3: What happens when nutrients are added to pond water?"},"content":{"rendered":"

\"producers\"<\/a><\/p>\nPrint<\/a>\n

Purposes<\/em><\/h3>\n
    \n
  1. To have students observe that adding nutrients to pond water promotes algae growth.<\/li>\n
  2. To help students see that increased algae growth causes cloudy water.<\/li>\n<\/ol>\n

    Description<\/em><\/h3>\n

    Recall that students have monitored samples of pond water that were exposed to sunlight and different nutrient<\/a> conditions.\u00a0 [Click here to view the instructions for the initial set up of this experiment<\/a>.]\u00a0 A short video showing algae growth in samples exposed to the same conditions as used in this student experience is available here<\/a>.\u00a0 Students watch this video as a quick refresher of what they observed over the three weeks.\u00a0 Students then review and discuss their recorded observations of this experiment. \u00a0In particular, they make comparisons across the different samples for different time points.<\/p>\n

    Samples with added nutrients should become cloudy and develop color (likely some shade of green), but samples with no added nutrients should remain more clear and less colored.\u00a0 Students may also notice that the cloudiness and color changes depend on different levels or different types of nutrients.\u00a0 Encourage students to consider the water source (pond or tap) when interpreting their observations and lead a discussion aimed at identifying algae as a possible source of the colored, cloudy water.\u00a0 Students should come away from the discussion with the idea that excess nutrients can promote algae growth and cause pond water to become cloudy.<\/p>\n

    Science Practices<\/div>
    \n Analyzing and Interpreting Data <\/a>\u00a0<\/b>By comparing observation notes with peers and engaging in discussion, students make sense of the observations that they have recorded over the past several days in order to reach consensus on patterns observed in the data.\u00a0 In addition, this experience provides an opportunity to engage students in discussion about what data they are finding most useful and how the organization of data can facilitate sense making.<\/div><\/div><\/div><\/div>\n

    \"Pond<\/a><\/p>\n

    Pond water jars after 3 weeks (from left to right: (1) tap water, (2) tap water with medium amount of fertilizer, (3) pond water, (4) pond water with low amount of fertilizer, (5) pond water with medium amount of fertilizer, and (6) pond water with high amount of fertilizer; see example conditions<\/a><\/em>\u00a0for more detail)<\/em><\/p>\n

    Questions to Ask Students When Discussing Results<\/em><\/h3>\n