Question

question 5
listen
how do plants obtain nitrogen?
a plants do not use nitrogen
b from the soil using their roots
c from the water
d from the air

Explanation:

Plants need nitrogen for growth. Nitrogen - fixing bacteria in the soil convert atmospheric nitrogen into forms (like nitrates) that plants can absorb. Plants absorb these nitrogen - containing compounds from the soil through their roots.
Option A is incorrect as plants do use nitrogen for processes like protein synthesis. Option C is wrong because water does not provide the main source of nitrogen for plants. Option D is incorrect as plants cannot directly take in nitrogen from the air (except in some very specialized cases which are not the general mode of nitrogen uptake).

Answer:

B. from the soil using their roots