Answer :
When the BEAN plant is observed with a hand lens, it was observed that there were more than 6 root nodules; option D.
What are root nodules?
Root nodules are nodules found on the root leguminous plant wherein nitrogen-fixing bacteria live which help in fixing atmospheric into the soil.
A hand lens is a magnifying lens which is used to view and enlarge the size of small objects.
A bean plant is a leguminous plant.
Using a hand lens to observe a bean plant will show the presence of root nodules.
Therefore, when the BEAN plant is observed with a hand lens, it was observed that there were more than 6 root nodules; option D.
Learn more about root nodules at: https://brainly.com/question/7901971
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