KSM NEET - BIOLOGY

  In biology, a cell is the fundamental structural and functional unit of all living organisms. It is the basic building block of life. Cells are microscopic, highly organized structures that carry out essential functions necessary for the survival and reproduction of living organisms. Here are some key features and characteristics of cells: Structure: Cells are enclosed by a semi-permeable membrane known as the cell membrane, which separates the cell's interior from its external environment. Inside the cell, there is a jelly-like substance called cytoplasm, where various cellular components are suspended. Genetic material : Cells contain genetic material in the form of deoxyribonucleic acid (DNA), which carries the genetic instructions needed for growth, development, and functioning. Types: Cells can be classified into two main categories based on the presence of a nucleus: prokaryotic cells and eukaryotic cells. Prokaryotic cells (e.g., bacteria and archaea) lack a membrane-boun...

The National Eligibility cum Entrance Test (NEET) UG is an entrance exam conducted by the National Testing Agency (NTA) for students seeking admission to undergraduate medical and dental courses in India. Here are some key points to note about NEET UG  The exam is conducted annually in the month of May and is held in offline mode (pen and paper-based). The exam consists of 180 multiple-choice questions, 45 from Physics, 45 from Chemistry and 90 from Biology (Botany and Zoology). The duration of the exam is 3 hours. The question paper is set in the languages of English, Hindi, Tamil, Telugu, Marathi, Bengali, Gujarati, Assamese, Oriya, Kannada and Urdu. The syllabus for the exam is based on the 11th and 12th class syllabus prescribed by the CBSE (Central Board of Secondary Education) and ICSE (Indian Certificate of Secondary Education) boards. The minimum age limit for appearing in NEET UG is 17 years as on December 31st of the year of admission. The exam scores are used for admissi...

  Viruses are small infectious agents that can only replicate inside living host cells. They are composed of a nucleic acid genome, either DNA or RNA, surrounded by a protein coat called a capsid. Some viruses also have an envelope, which is a lipid membrane derived from the host cell membrane that surrounds the capsid. The genetic material of viruses can be either single-stranded or double-stranded, and can be either RNA or DNA. Some viruses, such as retroviruses, have RNA genomes that are reverse transcribed into DNA upon entering the host cell. Others, such as herpesviruses, have large DNA genomes. Some common viral diseases include: Influenza : a respiratory illness caused by the influenza virus, which can lead to fever, cough, sore throat, and body aches. HIV/AIDS : a viral infection caused by the human immunodeficiency virus (HIV), which attacks the immune system and can lead to acquired immunodeficiency syndrome (AIDS). Hepatitis : a group of viral infections that affect the...

  Diatoms are unicellular algae that have a unique cell wall made of silica, a chemical compound that is hard and brittle. The cell wall of a diatom is called a frustule, and it consists of two overlapping valves that fit together like a pillbox. The frustule is perforated by small pores that allow for the exchange of gases and nutrients. The frustule is composed of two layers, an outer layer called the epitheca and an inner layer called the hypotheca. The two layers are fused together at the edges to form a tight seal that helps to maintain the structural integrity of the cell. The silica that makes up the frustule is arranged in intricate patterns that are characteristic of each species of diatom. These patterns can be seen under a microscope and are used to identify different species of diatoms. The unique structure of the diatom frustule makes it an important component of aquatic ecosystems, where it serves as a major source of food for many marine organisms. Additionally, the ...

  Classification systems have undergone several changes over time due to various reasons, including advancements in scientific knowledge and changes in scientific theories, discovery of new species, and improvements in technology. One of the earliest classification systems was developed by Aristotle in the fourth century BC, which was based on physical characteristics such as size, shape, and color, and were primarily used for identification and naming of species. Later, in the 18th century, Swedish botanist Carl Linnaeus developed the Linnaean classification system, which is still in use today. This system organizes living organisms into hierarchical categories based on their physical characteristics and evolutionary history. Over time, however, scientists began to realize that physical characteristics alone were not sufficient for classification, and that molecular and genetic information was also important. As a result, new classification systems based on DNA sequencing and ot...

  Age: One simple way to classify people is by age, such as children, teenagers, adults, and seniors. Gender: Another way to classify people is by gender, such as male, female, or non-binary. Occupation: People can be classified by their occupation, such as doctors, teachers, engineers, and so on. Education level: People can also be classified by their level of education, such as high school graduates, college graduates, or postgraduate degree holders. Cultural background: People can be classified by their cultural background, such as nationality, ethnicity, religion, or language. Personality traits: People can be classified by their personality traits, such as introverted, extroverted, analytical, creative, and so on.

Classification systems for living organisms are not fixed or static, but rather, they are constantly changing and evolving as our knowledge of the natural world expands. The reasons for these changes can vary, but here are some common reasons why classification systems may change: New discoveries: As scientists discover new species and gain a better understanding of existing ones, they may need to update the classification system to reflect these new findings. For example, new DNA sequencing techniques have led to the discovery of many new species that were previously unknown. Changes in scientific understanding: As our understanding of the relationships between different organisms evolves, classification systems may need to be revised to reflect these changes. For example, the development of evolutionary theory has led to changes in how organisms are classified based on their evolutionary history. Advances in technology: Advances in technology, such as new imaging techniques and m...