Leguminous plants are important in agriculture because-
Nitrogen-fixing bacteria are symbiotically associated with them
The correct answer is option D.
Explanation of the correct answer:
Figure showing the process of nitrogen fixation by Rhizobium:
Explanation of the incorrect options:
Option A:
Leguminous plants are naturally not disease-resistant, they can get diseases due to some microbes or pathogens.
Option B:
The seeds developed from the leguminous have high protein content in them because of which they are quite useful, but it is not the only reason for them to be useful.
Option C:
Leguminous plants need a high amount of nitrogen for their growth and development.
Final answer: Leguminous plants are important in agriculture because nitrogen-fixing bacteria are associated with them.