Biological organisation starts with Submicroscopic Molecular-level.

Explanation:

Biological organisation refers to the hierarchy of complex biological structures and systems that define life using a reductionistic approach. It starts from the simplest level of organisation, the submicroscopic molecular level, and progresses upwards to the cellular, tissue, organ, organismal, population, community, ecosystem, and finally the biosphere level.

Submicroscopic Molecular-level:

At the submicroscopic molecular level, the organisation of life begins with the smallest unit of matter, the atom, which is the building block of all molecules. Molecules are made up of atoms that are bonded together by chemical bonds. The most important molecules for life are organic molecules, which are carbon-based compounds that form the basis of all living organisms. Examples of organic molecules include proteins, carbohydrates, lipids, and nucleic acids. These molecules are the building blocks of cells and are responsible for the functioning of cells and organisms.

Cellular-level:

The cellular level of organisation is the next level of biological organisation. Cells are the basic units of life and are responsible for carrying out all the functions of living organisms. Cells are classified into two major types, prokaryotic and eukaryotic cells. Prokaryotic cells are simple, single-celled organisms that lack a nucleus and other membrane-bound organelles. Eukaryotic cells are more complex, multi-cellular organisms that have a nucleus and other membrane-bound organelles.

Organismic-level:

The organismic level of organisation refers to the individual organism, which is made up of many cells that work together to carry out specific functions. Organisms can be unicellular or multi-cellular, and they can be classified into different kingdoms based on their characteristics. The five major kingdoms are Monera, Protista, Fungi, Plantae, and Animalia.

Conclusion:

In conclusion, the biological organisation starts with the submicroscopic molecular level, which is the smallest unit of matter that forms the building blocks of life. From there, it progresses upwards to the cellular, tissue, organ, organismal, population, community, ecosystem, and finally the biosphere level.

Correct answer is 'sub microscopic level'.because all living organisms starts from the sub microscopic level. then atomic,then cellular,then tissue,organ ,organ system, organism.