Question

______ is needed for the synthesis of auxins.

• A. Zinc
• B. Molybdenum
• C. Copper
• D. Potassium

Answer 1

The correct option is A

Zinc

The correct option is A.

Explanation for the Correct option:

1. The discovery that zinc affects the manufacturing of auxins and gibberellins at the same time supports the idea that plant growth is influenced by a variety of growth components.
2. Plants also need zinc to make tryptophan, a necessary amino acid in the production of the auxin indoleacetic acid.
3. As a result of its indirect influence on auxins, zinc plays a role in plant development control.

Explanation for the Incorrect options:

Option B:

1. Molybdenum is a trace mineral that is required for life.
2. Molybdenum (Mo), a trace element that can be found in soil, is necessary for the production and function of the nitrate reductase enzyme.
3. The symbiotic nitrogen (N) fixation mechanism by Rhizobium bacteria in legume root nodules depends on molybdenum.

Option C:

1. One of the eight crucial micronutrients for plants is copper (Cu).
2. Copper is necessary for the formation of chlorophyll, seeds, and numerous enzymatic processes in plants.
3. A copper deficiency might increase a person's vulnerability to illnesses like ergot, which can significantly reduce tiny grain yields.

Option D:

1. In plant tissue, potassium is involved in the flow of water, minerals, and carbohydrates.
2. It has a role in the plant's enzyme activation, which has an impact on the synthesis of protein, starch, and adenosine triphosphate (ATP).
3. The rate of photosynthesis can be controlled by ATP synthesis.
4. As the most abundant cation in living plant cells, K⁺ constitutes 2%–10% of plant dry weight and plays an essential role in plant growth
   Final answer: Zinc is needed for the synthesis of auxins.