Question

Plant growing in Mg deficient soil will show
A. Deep green foliage
B. Early flowering
C. Yellowing of leaves
D. Loss of pigmentation in petals

Answer 1

Hint: Chlorophyll is a very important compound found in the plant and due to which they achieve photosynthesis. The amount of chlorophyll present in plants is directly dependent upon the concentration of magnesium taken up by the plant.

Complete answer:
We all know this fact that the plant requires chlorophyll to fulfill its functionality of the photosynthesis. The chlorophyll is an important ingredient for the process of photosynthesis. If we discuss the structure of chlorophyll then we will find that the central atom in the structure of chlorophyll is the Mg. So, we can say that chlorophyll shares a direct relation with the Mg atom. The amount of chlorophyll present in the plant is totally dependent upon the amount of Mg taken up by the plants from the roots.
The plants generally absorb Mg from the soil in the form of Mg ions. These Mg ions travel to the leaves and deposit in the stroma where they transform into the chlorophyll. Now, we also know the fact that the green colour of the plants is mainly due to the presence of chlorophyll. So, taking the relation under consideration, the deficiency in the amount of Mg ions will also lead to the deficiency of the chlorophyll. As the levels of chlorophyll drops into the leaves, the leaves start turning into yellow colour.

Therefore, the correct answer for the question is Option C.

Note:
The deficiency of the Mg can also lead to the death of the plant as chlorophyll helps in trapping the sunlight for the production of food. If chlorophyll levels keep on decreasing then the plant will also starve to death due to non-availability of the food.