Question

Name the most important elements required for a plant growth.
(A) Potassium, nitrogen and phosphorus
(B) Nitrogen, mercury and hydrogen
(C) Zinc, lead and mercury
(D) Oxygen, iodine and potassium

Answer 1

Hint :Nutrition is required for the growth and development of all living organisms like human beings, animals as well as plants. This nutrition is provided by essential elements and water in case of plants which would help in the unconditional growth of the plant.

Complete Step By Step Answer:
There are two types of nutrients which are required by plants for growth. They are macronutrients and micronutrients or trace elements.
Macronutrients – These are required by plant tissues in large amounts. It consists of nine elements such as carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur, potassium, calcium and magnesium. Out of these nine elements carbon, hydrogen and oxygen are obtained from carbon monoxide and water whereas other elements are absorbed from the soil as mineral nutrition.
Micronutrients – They are required by plants only in small amounts. They are eight in number which includes iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel. Out of these iron is required in large amounts compared to other micronutrients and molybdenum is required in the smallest quantity.
Potassium plays an important role in the opening as well as closing of stomata
Hence we can say that option A is correct Potassium, nitrogen and phosphorus.

Note :
All the above mentioned minerals are found in soil. We must always note that potassium, sulphur, calcium, phosphate are the main components which helps in promoting plant growth and also development. Hence we can say that these are the major minerals which plays a major role in controlling the growth and development.