Clearly explain how 0% weight change of a plant cell, in a solution of known solute concentration, can be used to determine the unknown solute concentration within the plant

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QUESTION 1

  1. List the First and Last Names of your group members.

 

QUESTION 2

  1. Title 

Write a proper Title for your Report

QUESTION 3

  1. Identify the purpose of your experiment.

Why are you doing this experiment?  (i.e. What do you hope to learn (experimental speaking) but conducting this experiment?

 

QUESTION 4

  1. Include background information.(The definitions need to directly relate to the experiment being conducted.)    Using complete sentences provide the definitions of: 

Osmosis 

Solute 

Solvent 

Solution 

Hypertonic solution 

Hypotonic solution

Isotonic solution

Iso-osmotic point 

 

QUESTION 5

  1. What molecule is crossing the plant cell membrane during osmosis? (Complete Sentences)

QUESTION 6

  1. Clearly explain how 0% weight change of a plant cell, in a solution of known solute concentration, can be used to determine the unknown solute concentration within the plant

QUESTION 7

Hypothesis 1

Predict what will happen to the weight of the plant cells, as the sucrose concentration increases?

 

QUESTION 8

Hypothesis 2

Predict how the solute concentrations (iso-osmotic points) of the plant samples will differ? (i.e. which plant type do you predict has a higher iso-osmotic point?)

 

QUESTION 9

  1. Clearly identify the 2 different independent variables

Independent variable from Hypothesis 1 =

Independent variable from Hypothesis 2 =

QUESTION 10

  1. Clearly identify the 2 different dependent variables

Dependent variable from Hypothesis 1 =

Dependent variable from Hypothesis 2 =

 

QUESTION 11

  1. Methods

 

Write a paragraph about everything YOU (and your own group) did during your experiment. [This section should only describe what YOU did, not the entire class].  It must be written so a reader could repeat your experiment exactly!   DO NOT write a protocol (i.e. do not tell ME what to do, tell me a story about what YOU did).  DO NOT number or bullet your steps.   Write the methods as such, “First we ………, then we …….” etc…

QUESTION 12

  1. Written Summary: Discusses your quantitative results.

Rewrite the following filling in the blanks with your data..

“The iso-osmotic point for Celery = ______ M and the iso-osmotic point for Potato tubers = ______ M.”

 

Rewrite the following using the correct response. 

“As the sucrose concentration decreased, the solution became more [hypotonic, hypertonic, or isotonic]

.

Rewrite the following filling in the blanks with your data.. 

At 0.0 M sucrose (distilled water) the % weight change for celery = _____% and potato tubers = _____. %

.

Rewrite the following using the correct response.  

“As the sucrose concentration increased, the solution became more [hypotonic, hypertonic, or isotonic]

 

Rewrite the following filling in the blanks with your data.. 

At 0.6 M sucrose (highest sucrose concentration) the % weight change for celery = _____ % and potato tubers = _____ % .

QUESTION 13

  1. Computer graph:

Upload your Line graph with both celery and potato tuber on same graph. Use the graph template from Blackboard.

 

 

QUESTION 14

  1. **Include the following information using complete

 

Restate Hypothesis 1.

Explain whether you accept or reject of your hypothesis and discuss the quantitative results you based your conclusions on.

(You need to include the actual data and explain what it means)

QUESTION 15

  1. Clearly explain (in complete sentences) the effects of diluted and high concentrations of sucrose on the plant cells.

 

    • Describe, in biological detail, why the cells gained/lost weight when incubated in solutions with more dilute (lower) sucrose concentrations and in solutions with higher sucrose concentrations? Use the terms osmosis, hypotonic, isotonic, and/or hypertonic where applicable.

 

The effects of diluted concentrations of sucrose on the plant cells =

The effects of high concentrations of sucrose on the plant cells =

 

QUESTION 16

  1. Restate Hypothesis 2.

Explain the acceptance or rejection of your hypothesis using the quantitative results you based your conclusions on.

(You need to include the actual data and explain what it means)

 

QUESTION 17

  1. Clearly discuss the correctsolute concentrations for both the celery and potato samples

What does the iso-osmotic point tell you about the solute concentration of each plant?

(You must include the exact solute concentration of each plant type.)

 

QUESTION 18

  1. Clearly explained your next future experiment about osmolarity and tonicity of solutions and why.

(Discuss the different independent variables you would investigate)