Question

Exposure of plant with high fluoride concentration results in necrosis and chlorosis of

• A. Stem tip and base
• B. Shoot apex, leaf tip and margin
• C. Midrib only
• D. Petiole only

Answer 1

The correct option is B Shoot apex, leaf tip and margin

The fluoride ions are present dissolved in the water present in the soil. When there is excessive pollution of fluoride, along with the water absorption, the fluoride ions are also absorbed and distributed in the plant. The water moves towards the tip of the leaf and towards the shoot apex. The fluoride gets accumulated at the tip. This results in the bleaching of the leaf tip and the margin. There is a loss of chlorophyll pigment which results in chlorosis or necrosis of the leaf tissues at the tip and the margins.

Thus, the correct answer is option B.