Which structures in the diagram are not directly involved in sexual reproduction?
a. stigma and ovary
b. sepal and petal
c. anther and stamen
d. stigma and pollen User: Root nodules are associations between bacteria and plant roots responsible for
a. helping the plant convert necessary carbon dioxide for use.
b. helping the plant convert necessary oxygen for use.
c. helping the plant convert the necessary water for use.
d. helping the plant convert the necessary nitrogen for use.