NEET BIOLOGY

Detailed explanation-1: -The deficiency of potassium in plants is visible in the leaves first. They start to turn yellow and brown with scorches present on them. However, the first symptoms of nitrogen deficiency in plants is the yellowing of leaves.

Detailed explanation-2: -Complete answer: Deficiency symptoms of nitrogen and potassium are visible first in senescent (older) leaves. Due to nitrogen deficiency the symptoms include poor plant growth, and leaves become pale green or yellow because they’re unable to form sufficient chlorophyll.

Detailed explanation-3: -Complete answer: The deficiency symptoms of Nitrogen and Potassium are characteristically seen in the old and senescent leaves of the plants. This is because plants generally move the nutrients from older parts to the younger leaves and hence deficiency symptoms are seen in senescent leaves first.

Detailed explanation-4: -For mobile elements like N and K, deficiency symptoms first appear in old and senescent leaves ns the elements are mobilised from senescing regions for supply to young tissues.