Answer 17 & 18 questions with the help of this paragraph.
The plants having root nodules secrete chemicals to attract
(17) into the surroundings
of roots and form a symbiotic relationship. These chemicals seal the wound and help the plant to
recover from injury. These chemical / compounds are called
(18).
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Explanation:
The root nodules contain the rizobium bacteria which help in the fixation of nitrogen gas
hence, Nitrogen gas is excreted by root nodules
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