Item 16 Anchor Papers    

A student is setting up an experiment using a type of bag that is permeable to water, but not to sugar. She will fill and weigh three bags and place each bag into a different beaker. The diagram below shows the contents of the bags and the beakers at the start of the experiment.

Predict whether after 15 minutes each bag will weigh less, the same, or more than it did at the beginning of the experiment. Provide reasons for each of your predictions.

Write your answer in your Answer Book.

Score Level 1 Anchor Paper

 

This response contains evidence of some understanding of the question. Although the student does not correctly predict the outcome of each beaker, minimal supporting details are given when the term "diffusion" is accurately used to describe the movement of water (water…will be evenly distributed…because diffusion is occurring).

image of student response

Score Level 1 Anchor Paper

 

This response contains evidence of some understanding of the question. The student correctly identifies diffusion, but incorrectly describes beaker one (the sugar water can go out of the bag since the bag isn't permeable to sugar water) and beaker two (sugar water can not come in.) The student implies that the environment will remain the same for beaker three (nothing can go in and nothing can come out).

image of student response

Score Level 1 Anchor Paper

 

This response contains evidence of some understanding of the question. The descriptions of beakers one and two are incorrect, they are reversed. The description of beaker three is correct. Although diffusion is mentioned in the description of the water's movement (water in the beaker will diffuse into the bag), the supporting details are only minimally effective.

image of student response

Score Level 2 Anchor Paper

 

This response contains evidence of a basic understanding of the question. The student provides adequate supporting details through the correct prediction for each beaker, (beaker 1…bag will become bigger; beaker 2…bag will become lighter; beaker 3…bag will stay the same) and a description of the water's movement (diffusion; water will try to create…equilibrium).

image of student response

Score Level 2 Anchor Paper

 

This response contains evidence of a basic understanding of the question. The student accurately predicts the outcome of all three beakers and correctly describes the movement of the in beaker 1 (it will soak in the distilled water) and in beaker 2 (distilled water will diffuse in sugar water). The supporting details are adequate.

image of student response

Score Level 2 Anchor Paper

 

This response contains evidence of a basic understanding of the question. The student correctly describes the environment within each of beakers. (…beaker 1's bag will weigh more; the bag in beaker 2…will shrink; nothing will happen in beaker 3.) The response is slightly enhanced by the accurate use of scientific terminology (hypotonic and osmosis); however, to achieve a higher score the response needs more elaboration, particularly concerning the concentration levels.

image of student response

Score Level 3 Anchor Paper

 

This response contains evidence of a good understanding of the question. The supporting details are generally complete. The student has appropriately described the three beakers and elaborated upon the given predictions. The response is further enhanced by a discussion of the term "osmosis" (water in the bag will be able to go through the bag to move into a more unconcentrated area.)

image of student response

Score Level 3 Anchor Paper

 

This response contains evidence of a good understanding of the question. The supporting details are generally complete. The student correctly predicts what will happen in each beaker and elaborates on the predictions, (Beaker 1…bag will weigh more…since the amount of water outside the bag is greater than the amount of water inside the bag; beaker 2…will weigh less…its water concentration is higher inside the bag than outside; beaker 3 will stay the same…concentration of the water inside and outside the bag are equal).

image of student response

Score Level 4 Anchor Paper

 

This response contains evidence of a full and complete understanding of the question. The student successfully integrates scientific terminology (hypotonic, hypertonic, solvents, diffusion equilibrium) into the predictions. A complete elaboration of the information is given, particularly in support of the accurate scientific concepts (in beaker 1 water is moving into the bag because there is a higher percentage of water outside than inside).

image of student response
 

Anchor Papers ~ Biology ~ Item 16

A student is setting up an experiment using a type of bag that is permeable to water, but not to sugar. She will fill and weigh three bags and place each bag into a different beaker. The diagram below shows the contents of the bags and the beakers at the start of the experiment.

Predict whether after 15 minutes each bag will weigh less, the same, or more than it did at the beginning of the experiment. Provide reasons for each of your predictions.

Write your answer in your Answer Book.

 

Score Level 1 Anchor Paper

 

This response contains evidence of some understanding of the question. Although the student does not correctly predict the outcome of each beaker, minimal supporting details are given when the term "diffusion" is accurately used to describe the movement of water (water…will be evenly distributed…because diffusion is occurring).

image of student response

 

Score Level 1 Anchor Paper

 

This response contains evidence of some understanding of the question. The student correctly identifies diffusion, but incorrectly describes beaker one (the sugar water can go out of the bag since the bag isn't permeable to sugar water) and beaker two (sugar water can not come in.) The student implies that the environment will remain the same for beaker three (nothing can go in and nothing can come out).

image of student response

 

Score Level 1 Anchor Paper

 

This response contains evidence of some understanding of the question. The descriptions of beakers one and two are incorrect, they are reversed. The description of beaker three is correct. Although diffusion is mentioned in the description of the water's movement (water in the beaker will diffuse into the bag), the supporting details are only minimally effective.

image of student response

 

Score Level 2 Anchor Paper

 

This response contains evidence of a basic understanding of the question. The student provides adequate supporting details through the correct prediction for each beaker, (beaker 1…bag will become bigger; beaker 2…bag will become lighter; beaker 3…bag will stay the same) and a description of the water's movement (diffusion; water will try to create…equilibrium).

image of student response

 

Score Level 2 Anchor Paper

 

This response contains evidence of a basic understanding of the question. The student accurately predicts the outcome of all three beakers and correctly describes the movement of the in beaker 1 (it will soak in the distilled water) and in beaker 2 (distilled water will diffuse in sugar water). The supporting details are adequate.

image of student response

 

Score Level 2 Anchor Paper

 

This response contains evidence of a basic understanding of the question. The student correctly describes the environment within each of beakers. (…beaker 1's bag will weigh more; the bag in beaker 2…will shrink; nothing will happen in beaker 3.) The response is slightly enhanced by the accurate use of scientific terminology (hypotonic and osmosis); however, to achieve a higher score the response needs more elaboration, particularly concerning the concentration levels.

image of student response

 

Score Level 3 Anchor Paper

 

This response contains evidence of a good understanding of the question. The supporting details are generally complete. The student has appropriately described the three beakers and elaborated upon the given predictions. The response is further enhanced by a discussion of the term "osmosis" (water in the bag will be able to go through the bag to move into a more unconcentrated area.)

image of student response

 

Score Level 3 Anchor Paper

 

This response contains evidence of a good understanding of the question. The supporting details are generally complete. The student correctly predicts what will happen in each beaker and elaborates on the predictions, (Beaker 1…bag will weigh more…since the amount of water outside the bag is greater than the amount of water inside the bag; beaker 2…will weigh less…its water concentration is higher inside the bag than outside; beaker 3 will stay the same…concentration of the water inside and outside the bag are equal).

image of student response

 

Score Level 4 Anchor Paper

 

This response contains evidence of a full and complete understanding of the question. The student successfully integrates scientific terminology (hypotonic, hypertonic, solvents, diffusion equilibrium) into the predictions. A complete elaboration of the information is given, particularly in support of the accurate scientific concepts (in beaker 1 water is moving into the bag because there is a higher percentage of water outside than inside).

image of student response