Vitrogen is an important nutrient for plants. Mark the statements that correctly describe nitrogen facts and plant nitrogen relations. Nitrate fed plants tend to have respitory quotient (RQ) values greater than 1 since some NADH is used for nitrate reduction instead of O2 reduction and additional CO2 is released from nitrate reduction to ammonium. Energy (i.e., carbon) costs between the assimilation of nitrate and ammonium are equivalent because both ions can be assimilated directly to amino acids. Ammonium (NH4+)can enter passively into the root through symplastic cation channels. Since this uptake process is passive, there's no respiratory energy required for ammonium uptake by the root. Three major forms of nitrogen that most plants uptake through their roots from the soil are nitrate (NO3), ammonium (NH4+), and di-nitrogen (N2). Plant root acquire nitrate (NO3) through an active uptake process from the soil. That is, nitrate needs to move against the electrochemical potential gradient to pass through the cell membrane and this process requires considerable respiratory energy in the form of ATP. Nitrate is likely to be leached to the ground water because of its high solubility and mobility associated with its charge. Soil particles are usually negatively charged to repel nitrate ions rather than adsorbing them..

1. Vitrogen is an important nutrient for plants. Mark the statements that correctly describe nitrogen
facts and plant nitrogen relations. Nitrate fed plants tend to have respitory quotient (RQ) values
greater than 1 since some NADH is used for nitrate reduction instead of O2 reduction and
additional CO2 is released from nitrate reduction to ammonium. Energy (i.e., carbon) costs
between the assimilation of nitrate and ammonium are equivalent because both ions can be
assimilated directly to amino acids. Ammonium (NH4+)can enter passively into the root through
symplastic cation channels. Since this uptake process is passive, there's no respiratory energy
required for ammonium uptake by the root. Three major forms of nitrogen that most plants uptake
through their roots from the soil are nitrate (NO3), ammonium (NH4+), and di-nitrogen (N2). Plant
root acquire nitrate (NO3) through an active uptake process from the soil. That is, nitrate needs to
move against the electrochemical potential gradient to pass through the cell membrane and this
process requires considerable respiratory energy in the form of ATP. Nitrate is likely to be leached
to the ground water because of its high solubility and mobility associated with its charge. Soil
particles are usually negatively charged to repel nitrate ions rather than adsorbing them.