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Thirty con seedlings of equal size were randomly assigned to one of three treatment groups. At the beginning of the experiment, the plants in group I were dried and the mass was determined. The plants in group II were maintained in light for a week. The plants in group II were maintained in the dark for a week. All conditions, other than light, were the same for groups Il and IlII. At the end of the week, the plants in groups Il and IIII were dried and the mass was determined. The experimental results are provided in the table.

Thirty con seedlings of equal size were randomly assigned to one of three treatment groups. At the beginning of the experiment, the plants in group I were dried and the mass was determined. The plants in group II were maintained in light for a week. The plants in group II were maintained in the dark for a week. All conditions, other than light, were the same for groups Il and IlII. At the end of the week, the plants in groups Il and IIII were dried and the mass was determined. The experimental results are provided in the table.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Experiment on Corn Seedlings: Effects of Light on Plant Mass** **Overview:** Thirty corn seedlings of equal size were randomly assigned to one of three treatment groups. At the beginning of the experiment, the plants in Group I were dried, and their mass was determined. The plants in Group II were maintained in light for a week, while the plants in Group III were kept in the dark for the same duration. All conditions other than light were the same for Groups II and III. At the end of the week, the plants in Groups II and III were dried, and their masses were determined. **Experimental Results Table:** | Treatment Group | Treatment | Initial Dry Mass of 10 Plants (g) | Dry Mass of 10 Plants After One Week (g) | Change in Dry Mass of 10 Plants Over One Week (g) | |-----------------|-----------|----------------------------------|-----------------------------------------|--------------------------------------------------| | I | None | 14.8 | N/A | N/A | | II | Light | 14.8 | 32.8 | +18 | | III | Dark | 14.8 | 11.7 | -3.1 | **Discussion:** (a) **Increase in Mass for Light-Grown Plants:** To explain the increase in mass of the light-grown plants, identify ONE inorganic source of new plant mass (e.g., carbon dioxide) and connect it to the cellular process underlying the increase in mass, such as photosynthesis. (b) **Decrease in Mass for Dark-Grown Plants:** To explain the decrease in mass of the dark-grown plants, identify the overall chemical reaction that is occurring in the plant cells (e.g., cellular respiration) and connect it to the cellular process underlying the decrease in mass.
Transcribed Image Text:**Experiment on Corn Seedlings: Effects of Light on Plant Mass** **Overview:** Thirty corn seedlings of equal size were randomly assigned to one of three treatment groups. At the beginning of the experiment, the plants in Group I were dried, and their mass was determined. The plants in Group II were maintained in light for a week, while the plants in Group III were kept in the dark for the same duration. All conditions other than light were the same for Groups II and III. At the end of the week, the plants in Groups II and III were dried, and their masses were determined. **Experimental Results Table:** | Treatment Group | Treatment | Initial Dry Mass of 10 Plants (g) | Dry Mass of 10 Plants After One Week (g) | Change in Dry Mass of 10 Plants Over One Week (g) | |-----------------|-----------|----------------------------------|-----------------------------------------|--------------------------------------------------| | I | None | 14.8 | N/A | N/A | | II | Light | 14.8 | 32.8 | +18 | | III | Dark | 14.8 | 11.7 | -3.1 | **Discussion:** (a) **Increase in Mass for Light-Grown Plants:** To explain the increase in mass of the light-grown plants, identify ONE inorganic source of new plant mass (e.g., carbon dioxide) and connect it to the cellular process underlying the increase in mass, such as photosynthesis. (b) **Decrease in Mass for Dark-Grown Plants:** To explain the decrease in mass of the dark-grown plants, identify the overall chemical reaction that is occurring in the plant cells (e.g., cellular respiration) and connect it to the cellular process underlying the decrease in mass.
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