I believe the answer is B, primary active transport. Root hair cells in plant use active transport to absorb mineral ions such as nitrates from the soil. The concentrations of minerals in the soil are lower in the soil than in within the root hair cell, therefore the transport will be against the concentration gradient which does not favor diffusion, therefore the pant has to use active transport.
These are some of the things that may cause denaturation:
external stress or compound such as a strong acid<span> or </span>base<span>, a concentrated </span>inorganic<span> salt, an </span>organic<span> solvent (e.g., </span>alcohol<span> or</span>chloroform<span>), radiation or </span>heat<span>.
</span>If this happens, cell activity may be disrupted and it can die.
<span>Plants that encourage the proliferation of nitrogen-fixing bacteria are d. legumes. Legumes are plants that are in a symbiotic relationship with bacteria that live in their root system. Plants cannot directly use atmospheric nitrogen. Thanks to the presence nitrogen-fixing bacteria in the root, legumes use atmospheric nitrogen indirectly because bacteria convert it into ammonia and ammonium available to plants. After the death of legumes, nitrogen from their remainings is available to the other plants.</span>