Introduction In ancient times, people used to think that the world had not changed. There is no such concept of evolution and origin. In the fifth century, BC Xenophane discovered some fossils and showed that there is a difference between the past and present organisms. In the fourth century BC, Aristotle proved that there are […]
Homologous vs Analogous organs Read More »
Introduction There are billions of species of plants in this world which can be seen everywhere in the plains, deserts, wetlands, or mountains. Plants evolved about billions of years ago and play many important roles in the ecosystem. All animals including humans are completely dependent on plants for food and shelter. They help in maintaining
Types of roots in plants: Tap root vs Fibrous root Read More »
Introduction A microscope is used to see objects that are not visible to the naked eye. The electron microscope is a breakthrough invention in microbiology. It is of two types based on its structure such as transmission electron microscope and Scanning electron microscope (SEM). This microscope accurately describes the smallest part of an object. After
Scanning electron microscope (SEM): Structure and description Read More »
Introduction The thin membrane on the outside of the protoplasm of eukaryotic and prokaryotic cells is called the cell membrane. It is a major part of the cell that mainly helps in protecting different parts of the cell from external damage. The cell membrane is formed by the transformation of the outer part of the
Cell membrane model: Types and definition Read More »
Introduction Cells are the smallest and basic unit of life for all plants and animals. Its effectiveness is wide and life is not possible without it. All the physiological functions of an organism are actually the sum of the functions of each cell in the body. A cell can be said to be living separately.
Golgi bodies or apparatus: Function and Definition Read More »
Introduction As we all know a cell is a structural unit of organisms. Each cell carries all the biological functions like respiration, nutrition, excretion, reproduction, growth, etc. That is why cells are also called functional units of the organisms. Different plant and animal cells have different structures and components. Each living cell is made up
Nucleus structure and function, definition Read More »
Introduction We are living in a diverse and colorful world. Earth is the only planet in our solar system where life sustains. The flora and fauna of the earth are very diverse. There are so many kinds of animals, plants, and microorganisms living on the earth. Among these organisms, only plants and some algae can
Chloroplast structure and function and definition Read More »
Introduction The word evolution comes from the Latin word evolvere. That means gradual development. Evolution refers to the process by which a simple organism evolves into a complex organism. The evolutionary process occurs slowly. At first, unicellular and simple organisms emerged on Earth. Evolution describes the emergence of more advanced and complex species from these
Darwin’s evolution theory or Darwinism Read More »
Introduction In 1809, the French biologist Lamarck published the first modern theory of evolution in his book ‘Philosophie Zoologique’. Lamarck’s evolution theory states that all the traits that an organism acquires by responding to changes in the environment are passed on from one generation to the next. According to Lamarck, although two plants of the
Lamarck’s evolution theory or Lamarckism Read More »
Introduction Electrical energy is the main source of all kinds of development. Electricity is used in lights, fans, televisions, refrigerators, various industrial plants, transportation systems, etc. Fan, refrigerators, television, etc. are all machines. A machine is a mechanical object that is made up of a combination of different parts to perform a specific task. The
How do Electric generator work? Types and Functions Read More »
