Prokaryotes and Eukaryotes (Biology) Class 7
In This Post, Let’s See Some Short Note On Prokaryotes and Eukaryotes. Let’s Start Topics LIke – Prokaryotes and Eukaryotes Diagram, Difference Between Prokaryotes & Eukaryotes, Prokaryotes and Eukaryotes Biology, Prokaryotes and Eukaryotes Notes.
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Prokaryotes and Eukaryotes
The term ‘prokaryote’ is derived from a combination of two Greek words, ‘pro’ meaning before and ‘karyon’ meaning nucleus. These are mostly single-celled, microscopic organisms. For example, bacteria. The genetic material of prokaryotes is not enclosed inside the nucleus, rather it is packed in a region called the nucleoid. Some prokaryotes can survive in harsh environmental conditions because of their genetic composition. For example, there are certain prokaryotes called thermophile which live in a temperature range between 40° and 120°C. They are found in geothermally (inside the Earth) heated water which comes out like a spring which is called hot water spring.
The term ‘eukaryote’ is derived from a combination of two Greek words, ‘eu’ meaning true
and ‘karyon’ meaning nucleus. These organisms are characterized by the presence of a well-defined
nucleus. The genetic material of eukaryotes is contained inside the nucleus which is covered by
the nuclear membrane. For example, fungi, humans, cats, whale, mosses, flowering plants, etc.
A scientist, named Linnaeus introduced two-kingdom classification, in which he classified all
living organisms into two kingdoms: Animalia and Plantae. The classification was based on how they
obtain their food and their ability to move.
The five-kingdom classification was proposed by R.H. Whittaker and he classified organisms into
five kingdoms such as:
Characters selected for five-kingdom classification were:
1. Cellular organization
2. Body organization
3. Mode of nutrition
The cell is the basic structural and functional unit of all living organisms. The cell is the building block of all living organisms. The control center of the cell is the nucleus. Nucleus encloses DNA or gene which determines the characters of all living organisms. According to whether a nucleus is present or not, organisms can be classified into groups:
1. Prokaryotes 2. Eukaryotes
Some organisms consist of only one cell in their body and other organisms possess millions of cell,
according to this, organisms can be classified into two groups.
Mode of Nutrition
Organisms can also be classified according to their mode of nutrition or how they obtain their food.
Tags: Prokaryotes and Eukaryotes Diagram, Difference Between Prokaryotes & Eukaryotes, Prokaryotes and Eukaryotes Biology, Prokaryotes and Eukaryotes Notes.