Question

Question 6 of 20

How do plants get the nitrogen they need to grow?
OA. They absorb nitrogen through their roots.
OB. They absorb nitrogen gas from the atmosphere.
OC. They create it during photosynthesis.
OD. They create it during respiration.
SUB

Answer 1

They absorb nitrogen through their roots.

Step-by-step explanation:

Nitrogen is ain't formed or involved in photosynthesis and respiration. So these options are eliminated.

Next is atmosphere. We know the
`\%` composition of nitrogen in the atmosphere is pretty high but plants are not capable of absorbing these free nitrogen directly from the atmosphere.

Hence plants absorb nitrogen from the soil in the form of ions like ammonium ions, nitrate ions, nitrite ions. Some plants also have leguminous nodules where tiny bacterias like rhizobium live and helps in the process of nitrogen fixation.