Junior high school biology knowledge points, species variety
Species variety was an important component of biological variety. It was the most intuitive embodiment of biological variety and also the core of the concept of biological variety. The differences between individuals of different species reflected the variety of species. Biological species and species would affect the ecosystem. At the same time, the variety of genes determined the variety of species, and the essence of the variety of species was the variety of genes. China was one of the countries with the richest biological species. For example, the species of mosses, ferns, and seed plants in China were second only to Brazil and Colombia, ranking third in the world. China was also the country with the richest gymnosperm, known as the " hometown of gymnosperm." In terms of biological classification, organisms were divided into different levels of taxonomical units according to the degree of similarity between organisms. From large to small, they were kingdom, phylum, class, order, family, species, and species. Species was the basic unit of classification, and the same species had the closest kinship. The larger the taxon, the more species it contained, but the less similar the species were, the fewer common characteristics, and the farther the kinship was. The smaller the taxon, the fewer species it contained, and the more common characteristics, the closer the kinship was. The fundamental measure to protect the biological variety was to protect the habitat of living creatures and the variety of the ecosystem. The establishment of nature reserves was the most effective measure to protect the biological variety. It was of great significance to protect the species, genes, and ecological environment. It was conducive to the stability of the ecosystem and could also provide humans with more kinds of biological resources and scientific research materials. Read more exciting novels for free
Junior high school biology glomerulus knowledge points summary
The following is a summary of the knowledge points related to glomeruli in junior high school biology: 1. ** In terms of structure ** - The glomerulus was a component of the nephrons, which were the basic units that formed urine. Each kidney was made up of more than one million nephrons. The glomerulus was formed by dozens of capillaries that were divided from the glomerular artery. The other end of the glomerular artery formed the glomerular artery. 2. ** Function ** - ** Filtrating effect **: During the formation of urine, the glomeruli and the walls of the kidney capsule play a role in filtering blood. Other than blood cells and large molecules of protein, all the plasma components could be filtered and formed into urine in the kidney vesicle. - ** Relationship with blood circulation (blood path)**: The kidney artery sends blood to the kidney, where the kidney artery → the glomerular capillaries (artery blood) → the glomerular capillaries (artery blood) → the glomerular capillaries (artery blood), and then the blood flows to the capillaries outside the kidney tubuli (artery blood, venous blood) → the kidney vein (venous blood). - ** Relationship with the formation and discharge of urine (urine)**: After being filtered by the glomeruli and the wall of the kidney vesicle, the original urine is formed in the kidney vesicle. The original urine is then reabsorbed by the kidney tubuli, and the rest forms urine. Finally, the urine is discharged from the body through the ureter, bladder, and uterus. 3. ** In terms of influencing factors ** - For example, when a man's blood serum level was 200 and his weight was 70 kilograms, the glomerular filtration rate of a 30-year-old person was 47, a 40-year-old person was 43, a 50-year-old person was 39, a 60-year-old person was 34, and a 70-year-old person was 29.9. The normal value of glomerular filtering rate was 90. The lower the value, the worse the kidney function. When the glomerular filtering rate was <30, it was severe kidney failure. 4. ** In terms of related diseases ** - Glomerulonepathy was a common kidney disease caused by glomerular damage caused by various reasons. Some or all of the symptoms of glomerular damage such as hematuria, proteinuria, edema, high blood pressure, decreased urine output or anuria, and abnormal kidney function would appear. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Junior high school biology breathing and photosynthesis knowledge points summary
Photosynthesis: - [Location: Phosphor.] The chlorites in the plastids could absorb light energy and provide energy for photosynthesis, so the plastids were the place where green plants carried out photosynthesis. - "Description: Green plants use light energy to convert carbon dioxide and water into organic matter that stores energy and releases oxygen." - Reaction formula: carbon dioxide + water $/stack {light energy}{→}$organic matter (stored energy)+ oxygen. - The conversion in the process: one was material conversion, which converted simple minerals (carbon dioxide and water) into complex organic matter and released oxygen; the other was energy conversion, which converted light energy into chemical energy stored in organic matter. - "The influencing factors include the intensity of light, because light is the source of energy for plants to carry out photosynthesis. Only under a certain intensity of light can they carry out photosynthesis to produce organic matter. It can only be formed under light. Breathing effect: - [Description: The process in which cells use oxygen to decompose organic matter into carbon dioxide and water, and release the energy stored in the organic matter for life activities.] <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
300 high school biology knowledge points summary
The following is a summary of some high school biology knowledge points: 1. The relationship between chemical elements and organisms: organisms contain a variety of chemical elements. These elements have different functions and effects in the body, such as forming compounds and participating in physiological processes. 2. The list of compounds in the cell: There are many kinds of compounds in the cell, such as sugar, fat, protein, and nuclear acid. Each of them has different structures and functions. For example, sugar is the main energy material, fat can store energy, and so on. 3. Nucleic acid was divided into DNA and DNA, and its basic units were respectively, DNA and DNA. 4. Identification of reducing sugar, fat, protein, and DNA in biological tissues: Use specific reagents for identification. For example, Fehling's reagent can identify reducing sugar and produce brick-red precipitations; Sultan III dye solution can identify fat and produce orange color, etc. 5. The characteristic of the membrane was that it was selectively pervious, allowing certain substances to pass through while preventing other substances from passing through. 6. The cell membrane's substance exchange function: The cell membrane can carry out substance exchange through free dispersion, assisted dispersion, active transportation, and other methods. 7. The similarities between mitochondria and plastids were that they both had a double-layered membrane structure, were related to energy conversion, and contained a small amount of DNA. 8. The comparison of eukaryote organelle: Different organelle had differences in structure and function. For example, the ER was the synthesis, processing, and transportation channel of protein and other molecular substances; the Golgi apparatus mainly processed, classified, and packaged the protein from the ER. 9. During mitosis, the changes of nuclear DNA, the nuclei of the nuclei, and the nuclei of the nuclei were as follows: during the interphase, DNA replication and the synthesis of related protein were carried out, and the DNA content was doubled; during the prophase of mitosis, the nuclei of the nuclei appeared, and at the anaphase, the nuclei of the nuclei split, and the sister Chromatids separated. 10. The source of ATP-in the body: It is mainly produced by cell breathing (both oxygen and oxygen free breathing) and photosynthesis. 11. [The destination of the ATP-binding in the body: It is used for various life activities of cells, such as muscle contraction and material synthesis.] 12. The comparison between light reaction and dark reaction in photosynthesis: the light reaction occurs on the thylakoid membrane of the plastids, producing oxygen, bound bound 13. The relationship between light energy utilization rate and photosynthesis efficiency: Light energy utilization rate refers to the ratio of the energy contained in the organic matter accumulated by the plant's photosynthesis to the sunlight energy that shines on the ground; photosynthesis efficiency refers to the ratio of the energy contained in the organic matter produced by green plants through photosynthesis to the light energy absorbed during photosynthesis. 14. The relationship between the external factors that affect photosynthesis and the improvement of light energy utilization: The external factors include light intensity, temperature, carbon dioxide concentration, etc., and appropriately increasing the value of these factors can improve the light energy utilization. 15. The metabolism of the three major nutrients in humans and animals: sugar, fat, and protein can be synthesized and decomposed in the body, and they can be converted to each other. 16. The comparison between the two types of breathing: Aerobic breathing produces a large amount of energy and requires oxygen to participate. The reaction site is mainly the mitochondria. The anoxia-less breathing produces a small amount of energy and does not require oxygen. The reaction site is the cellular matrix. In addition, there were also knowledge points about cell structure and function, gene expression, genetic laws, biological evolution, ecological systems, etc., such as cell membrane system, gene translation and translation process, Mendel's law of inheritance, modern biological evolution theory, etc.(Genetic frequency changes, isolation and speciation, etc.), the components of the ecosystem (producers, consumers, disposers, non-biological substances and energy), energy flow (one-way flow, step-by-step reduction), material circulation, and many other topics. These knowledge points were all important parts of high school biology learning, but due to space constraints, it was difficult to list all 300. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Jiangsu junior high school biology knowledge summary
Jiangsu Education Version Junior High School Biology Nucleus Structure Knowledge Points
The nucleus was one of the most prominent and important structures of a eukaryonic cell. It was usually spherical or oval in shape. Under the electron microscope, the nucleus was mainly composed of a nuclear membrane, a nucleus, and Chromatin. 1. Nuclear membrane: It is surrounded by the nucleus and is composed of two layers of membrane, separating the nucleus from the nucleus. There are also many kinds of membranes on the nuclear membrane. There were nuclear pores on the nuclear membrane. The nuclear pores were the channels for material exchange between the nucleus and the plasma. The exchange of protein and other biological molecules inside and outside the nucleus could not be separated from the nuclear pores. 2. Nucleus: A round or oval structure in the nucleus that is not surrounded by a membrane. In cells with high protein synthesis, there were often larger nuclei. 3. Chromatin: It is a dark-colored substance in the nucleus that is dyed by basic dye. It is mainly composed of DNA and protein. Chromatin was a thin and long silk. During cell division, it would undergo a high degree of coiling and other processes to form a chopstick. Chromatin and a chopstick were two forms of the same substance in the cell at different stages. A specific dye, methy-green pyronine, could be used for identification. The DNA was green and the DNA was red. The DNA was mainly distributed in the nucleus, while the DNA was mainly distributed in the plasma. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The knowledge points that must be tested in the biology test of the second year of junior high school
The compulsory knowledge points for biology in Grade Eight included, but were not limited to, the following: ** 1. Creature classification ** 1. The smaller the taxon, the more common characteristics the organisms contained, and the closer the kinship. The larger the taxon, the fewer common characteristics the organisms contained, and the farther the kinship. 2. The smaller the taxon, the fewer species it contained. Conversely, the larger the taxon, the more species it contained. 3. The same size principle meant that if two or more organisms belonged to a smaller taxon, they must belong to a larger taxon. 4. Species were the basic unit of biological classification. Species did not belong to the biological classification unit. Species were different forms of expression within the same species. For example, laying chickens and broiler chickens were different breeds of the same species. 5. The biological hierarchy system was composed of the order of each classification level according to its level and subordinate relationship. Based on this, the position of various organisms in different taxa could be found, such as dogs (dogs) belonging to animals, species belonging to dogs, canine, carnivorous, mammalia, vertebrae in the chordate, and animal kingdom. ** 2. Evidence of biological evolution ** 1. Creatures on Earth did not appear at the same time. Some continued to exist until now, while some were extinct. Modern creatures had gradually evolved over a long period of time. 2. Fossil was one of the evidence for the study of biological evolution, but it could also be studied by comparing the individual structure of different species. For example, by comparing the organs of some species, it was found that there was an evolutionary trend. Homological organs reflected the kinship between organisms. Homological organs had the same origin, and the differences in appearance were caused by adapting to different environments and performing different functions during evolution. 3. The study of molecular biology had a special significance for biological evolution. By determining the structure of protein and DNA, one could accurately determine the kinship between organisms. The closer the kinship, the smaller the difference between the protein or DNA molecules. Although the process of biological evolution was long and could not be directly observed or replicated through experiments, the laws of evolution could be summarized through comparison, induction, and reasoning. ** 3. Heredity and environment ** 1. The relationship between the gene type and the gene type - Generally, environmental conditions did not change the gene type, but the expression type was easily affected by environmental conditions. For example, the leaves of the water buttercup would be flat when it reached the surface of the water, but the leaves would split into threads when it was submerged in water. The white rabbit of the Himalayas would have different fur colors under different temperatures, but the ordinary white rabbit would not be affected by this temperature. 2. variation - Mutation was a common phenomenon in the biological world. - Inheritable mutations are caused by changes in genetic material (genetic composition). Trait mutations can be repeated in future generations. This variation will affect the metabolism of the organism and cause trait mutations. - Non-heritable mutations did not involve changes in genetic material. They were only caused by external environmental conditions. Trait mutations could not be passed on to future generations, such as plant height and bean size differences of the same pea variety planted in different plots, as well as the blackening of Caucasians due to exposure to the sun (the gene type did not change, but the expression changed). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
High School Biology Knowledge Points, Simple Version
The following is a simplified version of the high school biology knowledge: - ** Cell and internal environment ** - Body fluids were divided into two parts: the cellular fluid (2/3) and the extra-cellular fluid. The outer cell fluid formed the internal environment. Blood cells lived in plasma, and most cells lived in tissue fluid. The internal environment was the medium for the exchange of substances between cells and the outside world. The steady-state included the stability of osmic pressure, ph, and temperature. The osmic pressure was related to the number of solute particles. The plasma osmic pressure was mainly related to the content of mineral salt and protein. The concentration of physiological salt was 0.9% NaCl. - Internal environmental stability was a necessary condition for normal life activities and was maintained by the neurohumoral immune regulation network. - ** Nervous regulation ** - Excitement was a process in which tissues or cells moved after being stimulated. The basic method of neuroregulation was reflex. The reflex arc was composed of a receptor, an impudent nerve, a nerve center, an efferent nerve, and an receptor. - The resting potential was the external positive and internal negative formed by K effluence, and the external negative and internal positive action potential formed by Na influx when stimulated. Excitement is transmitted bi-directional on nerve fibers and uni-directional between neurons (axons → cell bodies or tributaries). The neurotransmitter is released from the presynaptic membrane in the vesicle and acts on the postsynaptic membrane. The cerebral hemisphere had advanced functions such as perception, reflex control, language, learning, memory, and thinking. - ** Hormonal regulation ** - Hormonal regulation was regulated by the secretion of chemicals by the hormonal organs (or cells), and there was a feedback regulation mechanism. Hormonal regulation was featured by its high efficiency, fluid transport, and action on target organs and cells. Hormones were deactivated after they took effect, and they were information molecules. Phytohormones were micro-organic substances produced in plants and transported to the place of effect to affect growth and development. - ** Immune system ** - The immune system is composed of immune organs (bone marrow, spleen, and tonsil), immune cells, and immune active substances (antibodies, lysmokines, and lysomes). Its functions are defense, clearance, and monitoring. Non-specific immunity includes the first line of defense composed of skin and mucus membrane, and the second line of defense composed of antiseptic substances and engulfing cells. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Complete version of biology high school knowledge points
High school biology knowledge was numerous and scattered, covering the following areas: 1. ** Material and structural basis of life **: Living organisms share the same material and structural basis. Except for viruses, living organisms are composed of cells, which are the basic units of structure and function. 2. Metabolism: Metabolism is the general term for all the orderly chemical changes in living cells. It is the foundation of life activities. 3. ** Reproduction and Development of Living Beings **: This includes the methods of reproduction and the process of individual development. 4. ** Life activity regulation **: For example, hormone regulation, nerve regulation, and other mechanisms that regulate the life activities of organisms. 5. ** Inheritance and Mutation **: It involves the transmission of hereditary substances, gene expression, gene mutation, gene reorganization, and aberrations. 6. [Origin of Life and Evolution of Living Beings]: Including the hypothesis of the origin of life and the theory of biological evolution. 7. ** Biology and the environment **: The relationship between organisms, organisms, and the organic environment. In the elective section, the knowledge points of Biology elective three were focused on genetic engineering, cell engineering, embryo engineering, and so on. These knowledge points needed to be systematically summarized and summarized to build a knowledge framework. They also needed to pay attention to the bold words and chapter summary in the textbook. Through special training and accurate brushing of questions, they could improve the accuracy of the questions to better grasp the high school biology knowledge. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
High school biology and human health knowledge points
The following are some knowledge points related to high school biology and human health: - ** Nutrient Function ** - ** Energy-supplying substance **: Carboids, fats, and protein can all provide energy for the body's decomposition. The order of energy supply is sugar, fat, and protein. - ** Building and repairing tissues **: The main raw material for building and repairing tissues is protein. Carboids and fats are important components of cell membranes and nerve tissues. The main components of bones are calcium (Ka), calcium (MG), and phosphorus (P). Some hormones and other substances are protein. - ** Regulating substance **: Iodine is the main component of the hormone. - ** Malnutrition and Overnutrition ** - ** Malnutrition * - A lack of protein supply would affect development and resistance. - The lack of nutrition and calcium affects bone development. - A deficiency of vitamins A can cause night blindness, and a deficiency of vitamins C can cause scurvy. - [Overnutrition: Obtaining too much energy will cause you to become obese.] - ** reasonable diet **: Food should be non-toxic to the human body and meet the requirements of food hygiene. The type, quantity, and proportion of nutrients should meet the actual needs. Food should be processed reasonably to reduce the loss of nutrients and improve the utilization rate. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Junior high school biology core knowledge must be memorized
The following is the core knowledge of junior high school biology: 1. ** The basic process of scientific inquiry **: raise questions, make assumptions, formulate plans, implement plans, draw conclusions, and express communication. 2. ** Microscope operation steps **: Take and place, light up, place and mount, observe, organize and store. 3. ** Steps for temporary mounting ** - ** Plant Cell **: Wipe, drip, tear, expand, cover, dye, suck. - ** Animal cells **: rub, drip, scrape, smear, cover, dye, suck. 4. ** Multi-cell organism structure level ** - ** Animal Body (or Human Body)**: Cell, tissue, organ, system, animal body (or human body). - ** Plant **: Cell, tissue, organ, plant. 5. ** The whole process of breathing **: Air exchange between the lungs and the outside world (lung ventilation), air exchange in the lungs, air transport in the blood, and air exchange in the tissues. 6. ** Digestive tract composition **: Mouth, throat, esophagus, stomach, small intestine, large intestine, anus. 7. ** Circulatory pathways **: left heart, main artery, arteries of all levels, capillaries of the whole body, veins of all levels, superior and inferior venous pathways, and right atrium. 8. ** Lung circulation pathway **: right heart, lung artery, capillaries around the lung, lung vein, left atrium. 9. ** Vision formation process **: The external light passes through the retina, humor, pupil, crystalline lens, and vitreal body to form an inverted image in the retina. It is transmitted to the visual center of the cerebral hemisphere through the optical nerve to form an upright image. 10. ** Hearing formation process **: Sound waves pass through the external ear canal, eardrum, ossicles, cochleae, and auditory nerve to transmit nerve impulses to the auditory center of the cerebral hemisphere to form hearing. 11. ** The specific process of urine formation ** 12. ** Reflex arc transmission process **: receptor, sensory nerve fiber, nerve center, efferent nerve fiber, and receptor. 13. ** Order of taxa **: Species, Genus, Family, Order, Class, Phylum, Realm. 14. ** Insect development process ** - ** Complete metamorphosis **: Zygote, larva, pupa, adult. - ** Incomplete metamorphosis **: Zygote, larva, adult. 15. ** Primitive life origin process **: Small organic molecules, independent systems, primitive life (marked by primitive metabolism and individual reproduction). 16. "Comparisons of the evolution of the heart in vertebrae": fish had one heart and one chamber; amphibians had two hearts and one chamber; reptiles had two hearts and one chamber with an incomplete membrane in the heart chamber; birds and mammals had two hearts and two chambers. 17. ** Evolution of Plants and Vertebrates, and Human Evolution **: The evolution of Plants and Vertebrates. Humans evolved into the Southern Ape, Homo hcapable, Homo Erectus, and Homo Sophomis. 18. ** Yogurt production steps **: sterilization, inoculation, sealing, fermentation. 19. **'Not necessarily' in creatures ** - The producers were not necessarily green plants, but also chemical synthetic bacteria and photosynthetic bacteria. - The consumers were not necessarily animals, but also parasitic bacteria and fungi. - The decompose was not necessarily the bacteria and fungi that lived in a saprotic manner. Some animals, such as earthworms and dung beetles, lived in a saprotic manner by eating animal carcasses and relics. - Some animals were not necessarily consumers, such as earthworms and dung beetles. - Some dicotyledonous seeds have an inner core, while some of the monots have no inner core. - There were some biological classifications that were similar to "fish" but not fish. For example, salamanders were amputated, whales were mammals, turtles and crocodiles were reptiles, and octopuses were mollusks. - Scorpions and spiders belonged to the arachnid class of arthropods, centipedes belonged to the polypod class, and ants belonged to insects but generally had no wings. These did not belong to the category of insects. - Green plants did not only produce organic matter from their leaves. The green parts of the plant could be produced by the plastids, but the leaves were the main organs. Not all cells in a living plant could be cultured. The vessels could not be cultured if they were dead cells. - Not all fish with the word "fish" in their names were fish. Seahorses, Chinese sturgeons, and loaches were fish. Not all fish that lived in water and could swim were fish. Dolphins and whales were mammals. Not all aquatic animals breathed with gills. Aquatic mammals and aquatic reptiles breathed with lungs. 20. ** Except for viruses, organisms are composed of cells, which are the basic unit of biological structure and function. The biosphere provides nutrients, sunlight, air, water, suitable temperature, living space, and other basic conditions for the survival of organisms. The environmental factors are divided into biological factors and non-biological factors. The biosphere includes the bottom of the atmosphere, most of the water sphere, and the surface of the rock sphere. The ecosystem is composed of biological parts.(producer, consumer, decompose) and non-biological parts (Sunlight, air, water, etc.). The producer and the consumer are food chains formed by the relationship between eating and being eaten. The food chain is interlaced to form a food web, and matter and energy flow along the food chain and food web. The largest ecosystem is the biosphere. The steps of using the microscope include taking and placing the lens, illuminating, observing, cleaning and collecting the lens. The eyepieces see inverted images. The magnifying power of the microscope is the product of the magnifying power of the objective lens and the magnifying power of the eyepieces. The words written on the glass slide are regularly formed in the field of view. The preparation steps of onion scale leaf skin cells and human oral cavity cells; the comparison of animal and plant cell structures: animal cells have no cell walls, plastids, and vesicles; cells are composed of organic and organic substances; cell membranes control the entry and exit of substances; plastids (plants) and mitochondria (animals and plants) are energy convertors;DNA is the main genetic material; The cells differentiate to form tissues. The human body has a system, but the plant body has no system. The virus is composed of a protein shell and internal genetic material. It will become a crystal when it leaves the living cells. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>