Question

Why do plants do not utilize nitrogen directly from atmosphere?

Answer 1

Plants do not use nitrogen directly from the air because nitrogen is noble gas and is unreactive, and cannot be used by green plants to make protein. Nitrogen gas therefore, needs to be converted into nitrate compound in the soil by nitrogen-fixing bacteria in soil, root nodules so that plants can use it.

Hope it helps...

Answer 2

Nitrogen is least reactive in nature and cannot be directly used by the plants.

Explanation:

• The nitrogen gas consists of more 78% in the atmosphere. The nitrogen plays an important role both in plants and animals.
• The nitrogen molecule consists triple bond and are highly stable in the environment. The least reactivity of the nitrogen does not allow the green plants to use them directly.
• Nitrogen must be converted into nitrites and nitrates by the nitrifying and  denitrification bacteria.
• The nitrogen must be recycled in the atmosphere by the presence of nitrogen cycle.

# Learn more with brainly about nitrogen cycle:

Nitrogen: https://brainly.in/question/9261978.

Nitrogen fixation: https://brainly.in/question/10322450.