The process of utilising the absorbed nutrients obtained from the food is called assimilation.

Assimilation in Plants
Assimilation is the process by which plants convert the organic nutrients obtained from photosynthesis into their own tissues. It is an essential part of plant metabolism as it allows plants to grow and develop.

Types of Assimilation:
- Nitrogen assimilation: Plants absorb nitrogen from the soil in the form of nitrates and ammonium ions. They then convert this nitrogen into amino acids and proteins.
- Carbon assimilation: Plants take in carbon dioxide from the atmosphere during photosynthesis and convert it into carbohydrates such as glucose and starch.
- Phosphorus assimilation: Plants absorb phosphorus from the soil in the form of phosphate ions. They use this phosphorus to make nucleic acids, ATP, and other important molecules.

Process of Assimilation:
1. Absorption: Plants absorb nutrients from the soil through their roots. These nutrients include water, minerals, and other essential elements.
2. Translocation: Once absorbed, nutrients are transported through the plant via xylem and phloem vessels.
3. Conversion: Plants use enzymes to convert the absorbed nutrients into organic molecules such as proteins, carbohydrates, and lipids.
4. Metabolism: The organic molecules are then used by the plant for growth, repair, and energy production.

Importance of Assimilation:
- Assimilation is crucial for plant growth and development.
- It provides plants with the necessary nutrients to carry out essential metabolic processes.
- It allows plants to store excess nutrients for future use.
In conclusion, assimilation is a vital process in plants as it enables them to convert raw materials into usable nutrients for growth and survival.