The direct role of flavonoids in nodule formation is to:
A) stimulate formation of infection threads.
B) stimulate cell wall degradation.
C) stimulate root-hair curling.
D) attract rhizobia.
E) activate the plant Nod genes.
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Q21: A symbiosome consists of:
A)bacterioids only.
B)bacterioids and the
Q22: Which of the following statements about leghemoglobin
Q23: Which of the following statements about nitrogenase
Q24: Nitrite is oxidized to nitrate by:
A)Nitrosomonas.
B)Nitrobacter.
C)ammonifying bacteria
Q25: A determinate nodule is different from an
Q27: Rhizobia enter legumes by invading the:
A)seeds.
B)root hairs.
C)stems.
D)leaves.
E)flowers.
Q28: Which of the following is NOT a
Q29: Which of the following is NOT a
Q30: Which of the following is(are) a product
Q31: The _ symbiosis is an example of
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