Question

Nitrogen as a nutrient element is highly immobile in plants.
A) True
B) False

Answer 1

Hint: A plant which is deficient in nitrogen generally shows stunted growth and develops slowly because it lacks the nitrogen to manufacture enough genetic and structural materials.

Complete answer:
The plants which are healthy mostly contain 3 to 4 percent nitrogen in their tissues above ground. In two forms, plants can absorb nitrogen i.e $N{H}_4+$ and $N{O}_3-$ ions, It has been observed that nitrogen is taken up as nitrate. When roots absorb water, along with it nitrate moves freely towards plant roots.
$N{O}_3-$ is reduced to $N{H}_2$ form, once it is inside the plant. The plant should have an extensive root system so that large quantities of nitrogen can be absorbed without any restricted uptake. As plant size increases, nitrogen demands too increases and they take nitrogen from the soils continuously throughout their lives. When plants have an adequate amount of nitrogen, they will grow rapidly and produce large amounts of succulent, green foliage. Nitrogen is a mobile nutrient as nitrogen inside the plant will move from less important older tissues to more important younger tissues, ageing leaves often become necrotic and die as the nitrogen moves to younger ones. For crops nitrogen is an essential nutrient to achieve optimum yields. Nitrogen is an important component of amino acids which makes proteins, it also helps in increasing protein contents of plants directly. Bacteria such as Rhizobia which infect the roots and get energy from legume plants are responsible for fixing more nitrogen in a year.

So the correct answer is “False”.

Note:The mucus and bicarbonates present in the gastric juice help in the lubrication and protection of mucosal epithelium from destruction by concentrated $HCl$. Gastric glands present in stomach mucosa are of three types, namely mucous neck cells, peptic or chief cell, parietal or oxyntic cell.