Question

Select the choice describing the latest event in the endosymbiosis between plants and nitrogen-fixing bacteroids: O plants secrete flavonoids to permit their recognition by specific bacterial species O plant TCA cycle releases C4-dicarboxylic acids to bacteroid bacterial cells differentiate into bacteroids root hairs exhibit curling infection thread enters root cortex

Answer 1

Answer: Option B is correct
Explanation:
Steps in root nodule formation:
1. The soil-dwelling Rhizobium is attracted to plant roots due to the secretion of specific flavanoids
2. Curling of the root hair
3. Formation of the infection thread and colonization of cortical cells
4. Modification of bacteria into Bacteroides
5. Cell division in the cortical cells to form the nodule
6. The nodule ultimately gets connected to the vascular tissue
7. Plant TCA cycle releases C4-dicarboxylic acids to bacteroid

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