List of all Chapters and Unit Downalod Class 9 Biology Notes for Punjab board
Chapter #1 Introduction to Biology
Biology is the study of life. These include the cellular basis of living things, the energy metabolism that reduces life activities, and the genetic basis of heredity in organisms types of practical biology include plant breeding, wildlife management, medical science, and crop production.
Basically, a cell consists of three parts: the cell membrane, the nucleus, and between the two, the cytoplasm. Tissue is a group of cells that have a similar structure and work together as one unit. The basic types of body tissues include epithelial, connective, muscular, and nerve tissues.
The cell cycle is a series of events that grow and divide in the cell. … The cell then leaves the interface, undergoes mitosis, and completes its division. The resulting cells, known as daughter cells, each enter their own phase and begin a new cycle of the cell cycle.
Enzymes are proteins that help speed up the metabolism, or chemical reactions in our body. They make some substances and break down others. All living things have enzymes. Our bodies produce enzymes naturally. But enzymes are also present in finished products and food.
Bioengineering is a branch of biochemistry that focuses on how cells convert energy, often through the production, storage or use of adenosine triphosphate (ATP). Bioenergetic processes, such as cellular respiration or photosynthesis, are essential for most aspects of cellular metabolism, so for life itself.
Nutrition is a biological and physical process by which an organism uses food to sustain its life. These include digestion, absorption, supplementation, biosynthesis, catabolism, and excretion. The science that studies the physiological process of nutrition is also called nutrition science.
In biology, transportation refers to the process or means by which a molecule or ion is transmitted through a cell membrane or through the blood. In this regard, there are two types of transportation: (1) passive transport and (2) active transport.