Part A: Observing Roots (Score for Question 1: ___ of 10 points)
• Record your observations of the roots of the bean and radish plants in the appropriate data chart. Be sure to include a sketch of each plant’s roots.

Data Chart: Bean Plant
Nodules present?

Number of nodules

Number of pink nodules

Number of green nodules

Sketch roots and nodules here or on a separate piece of paper

Data Chart: Radish Plant
Nodules present?

Similarities to bean roots

Differences from bean roots

Sketch roots here or on a separate piece of paper

Part B: Observing Rhizobium with a Microscope
(Score for Question 3: ___ of 10 points)
• Sketch the bean nodule, labeling cells with and without Rhizobium, showing what you observed in the micrographs.

(Score for Question 4: ___ of 2 points)
• Two new species of plants were introduced into an area that was low in available nitrogen compounds in the soil. One formed nodules and one did not. Which species would you reasonably expect to grow more robustly? Explain.

(Score for Question 5: ___ of 2 points)
• How does the location of the nodules relate to the function of the nodule? Explain.

(Score for Question 6: ___ of 2 points)
• This diagram shows two groups of plant cells, one with Rhizobium and one without the bacteria. Label which is which, and explain the obvious size difference, using observations from Part C of the lab in your answer.