Question

A fertiliser has a formula of three figures 15-9-9.They stand for the percentage of.
A) Na, Ca and Mg
B) Mg, P and K
C) Ca, N and Fe
D) N, Pand K

Answer 1

Hint: Fertilisers are defined as a diverse group of products that typically contain nitrogen, phosphorus, potassium, and other trace minerals in various chemical forms.

Complete answer:
Fertilisers are usually added to plants for the three major plant nutrients (nitrogen, phosphorus, and potassium).Fertilisers are applied to the soil so that the nutrients are absorbed by plants through their roots.
>Option A: The role of Ca is to hold together the cell walls of plants.Magnesium is the central core of the chlorophyll molecule in plant tissue.It is required for the overall growth of the plant.The three figures 15-9-9 on fertiliser represent the value of the three macronutrients used by plants.
These macronutrients are nitrogen (N), phosphorus (P), and potassium (K) or NPK for short.NPK is a complex fertilizer composed primarily of the three primary nutrients required for healthy plant growth.Therefore, this is an incorrect option.
>Option B: The three figures 15-9-9 on fertiliser represent the value of the three macronutrients used by plants.These macronutrients are nitrogen (N), phosphorus (P), and potassium (K) or NPK for short.NPK is a complex fertilizer composed primarily of the three primary nutrients required for healthy plant growth.Therefore, this is an incorrect option.
>Option C: Nitrogen (N), phosphorus (P), and potassium (K) or NPK for short.NPK is a complex fertilizer composed primarily of the three primary nutrients required for healthy plant growth.It is represented by three figures 15-9-9 on fertiliser.Therefore, this is an incorrect option.
Option D: The three figures 15-9-9 on fertiliser represent the value of the three macronutrients used by plants.These macronutrients are nitrogen (N), phosphorus (P), and potassium (K) or NPK for short.NPK is a complex fertilizer composed primarily of the three primary nutrients required for healthy plant growth.Nitrogen is essential for green plant growth and enables plants to manufacture food from sunlight through photosynthesis.Phosphorus aids the plant in the earliest stages of development and facilitates the reproductive fruiting process.Potassium boosts plant vigour and disease and stress resistance.Therefore, this is the correct option.

Hence the correct answer is option ‘D’.


Note:It is to be noted that 38% of the total fertiliser is nitrogen, phosphorus, or potassium. The advantages of using fertilizers are,
>They have a speedy effect on the crops.
>They help in supplying a specific nutrient to the plant.
>They are water soluble and can dissolve easily in soil and get absorbed by the plants.
>They are very easy to store, transport and apply.