Growth at cellular level, is principally a consequence of increase in the amount of Protoplasm

Growth at the cellular level refers to an increase in the size and mass of individual cells. This growth is primarily attributed to an increase in the amount of protoplasm within the cell. Protoplasm is the living substance within a cell that includes the cytoplasm and the nucleus.

Explanation:

1. Protoplasm as the living substance
Protoplasm is often referred to as the "living substance" because it is responsible for carrying out various cellular functions and processes that are essential for the survival and growth of the cell. It is composed of various organic and inorganic molecules, including proteins, nucleic acids, carbohydrates, lipids, and minerals.

2. Increase in protoplasm leads to cell growth
As a cell grows, it requires more protoplasm to accommodate the increased metabolic activities and cellular components. The increase in protoplasm is primarily achieved through the synthesis of various biomolecules, such as proteins and nucleic acids, which are essential for cell growth and division.

3. Role of DNA in cell growth
Although DNA is an important component of the cell, it is not the primary cause of cell growth. DNA contains the genetic information that determines the structure and function of the cell, but it does not directly contribute to the increase in cell size. Instead, DNA replication occurs during the cell cycle to ensure that each daughter cell receives a complete set of genetic material.

4. Cell wall and organelles
The cell wall is a rigid structure found in plant cells that provides support and protection. While the cell wall may contribute to the overall size of the cell, it is not directly involved in the growth of the protoplasm. Similarly, cell organelles, such as mitochondria, endoplasmic reticulum, and Golgi apparatus, play specific roles in cellular processes but do not directly contribute to cell growth.

Conclusion:

In summary, growth at the cellular level is principally a consequence of an increase in the amount of protoplasm within the cell. Protoplasm is the living substance that carries out cellular functions and processes. While DNA, cell wall, and organelles are important components of the cell, they do not directly contribute to cell growth.