Seventh grade biological organ system
In seventh grade biology, organs were a structure formed by different tissues gathering together in a certain order to complete a certain function. For example, a chicken wing was an organ. It consisted of tissues such as esophagus, nerve tissue, muscle tissue, and so on. These tissues were arranged on the chicken wing with certain characteristics. For example, the esophagus was outside, the fat was under the skin, the muscle was attached to the bone, and the bone was the innermost part. The blood vessels were widely distributed, and its main function was to flap the wings. A system is a structure that consists of multiple organs combined in a certain order to complete one or more physiological functions. The human body had eight major systems, including the reproductive system, digestive system, respiratory system, circulatory system, urological system, nervous system, hormonal system, and motor system. In terms of the structure of an organism, cells were the basic unit of the structure and function of the organism. The cells differentiated to form tissues, and different tissues formed organs. The organs formed systems, and the coordination of various systems made the organism a unified whole. For example, in animals, multiple organs are combined into a system according to a certain order, and multiple systems cooperate with each other to maintain the normal operation of life activities. Read more exciting novels for free
Seventh grade, second volume, biological nutrient exchange
In the second volume of biology, nutrient exchange mainly involved the exchange of nutrients between the fetus and the mother, as well as the absorption of nutrients in the human digestive system. The organ that exchanges nutrients between the fetus and the mother is the placenta. The nutrients and oxygen in the mother's blood enter the fetus through the placenta, while the carbon dioxide and waste produced by the fetus enter the mother through the placenta. In the human digestive system, nutrients in food such as starch, fat, protein and other large molecules, organic matter with complex structures are gradually decomposed into simple substances in the digestive system and absorbed. For example, the saliva glands in the oral cavity secrete saliva, which contains saliva starch to digest starch. The gastric glands secrete gastric juice, which contains pepsin to digest protein. The small intestine is the main place for digestion and absorption. Here, nutrients are fully digested and absorbed into the blood circulation, and then transported to cells throughout the body for use. The nutrients that the human body needed were mainly sugar, fat, protein, water, mineral salt, vitamins, etc. Among them, sugar was the most important energy supply material for daily activities of the human body, fat was the backup energy material, protein was the basic material that constituted human cells and participated in the repair and regeneration of damaged cells, water was the main component of cells, mineral salt was an important component of human tissues, and vitamins played a regulating role in human life activities. These nutrients were exchanged from the outside world to the human body through the digestion and absorption process of the digestive system to maintain normal life activities. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Seventh grade biological geography paper must be tested
The following are some of the topics that might be tested in the seventh grade biology and geography papers: * * 1. Biological Part ** 1. * * Creatures and the environment ** - The concept of an ecosystem was like the ecosystem formed by all the creatures in the Xiangjiang River and their living environment. Understand the components of an ecosystem, including producers (such as plants that can use light to produce organic matter), consumers, and decompose, as well as non-biological components (such as environmental factors such as temperature and moisture). - The influence of biological factors on organisms, such as competition (for example, wheat and weeds in the wheat field compete for sunlight, water and other resources), predator relationship, etc. - The influence of the environment on organisms, such as oranges mainly distributed in the south and apples mainly distributed in the north, was affected by the ecological factor of temperature. 2. * * Cell structure and function ** - To use a microscope, the material must be thin and transparent before it could be used for microscopic observation. When using a microscope, the aperture should be adjusted and a concave mirror should be used when the light is dark. - The structures shared by plant cells and animal cells (such as mitochondria, which are the energy convertors shared by plant and animal cells), as well as the structures unique to plant cells (such as plastids, cell walls, and vesicles). The correct operation of making the temporary mounting of the onion scale leaf inner skin cells (such as dripping clear water in the center of the slide, flattening the torn inner skin, covering the cover glass with water droplets first and then slowly putting it down, adding the solution of iodination from one side and draining it with blotting paper from the other side during dyeing, etc.). 3. * * The physiological functions of plants ** - photosynthesis, exhalation, and transpirations. The trees on the campus could photosynthesize, breathe, and evaporate in early summer. The essence of photosynthesis was to synthesize organic matter and store energy. The essence of breathing was to decompose organic matter and release energy. The carbon dioxide produced by plant breathing could be verified with a black plastic bag (because black could avoid the interference of photosynthesis on the experiment). - The conditions for the seeds to germinate were that the wheat seeds stored in the granary generally did not germinate because of the lack of water. - The relationship between the structure of the flower and the development of the fruit. For example, in peach blossoms, the ovaries could develop into fruits, and the ovules inside the ovaries developed into seeds. The process of pollen falling on the pistil was called pollen. 4. * * Plant Groups ** - Algal plants did not have roots, stems, and leaves. They were distributed in the water environment and provided most of the oxygen in the air. 5. * * Cell division and inheritance ** - The change in the number of microorganisms in the process of cell division. The human nucleus has 46 microorganisms. After two divisions, four cells are formed. The number of microorganisms in each cell remains unchanged at 46. - Knowledge related to cloning technology, such as cloning animals, explained that the genetic information was in the nucleus, and the traits of cloned animals were the most similar to those of the nucleus donor. * * 2. Geography ** 1. * * The movement of the earth ** - The direction of the Earth's rotation (from west to east), the cycle (one day or 24 hours), the rotation of the Earth produces the phenomenon of day and night alternating, which is why we see the sun rising in the east and setting in the west. - The knowledge of the latitude and longitude network, how to determine the location of a point on the earth by latitude (the equator is 0 °, increasing north is north latitude, increasing south is south latitude) and longitude (the prime meridian is 0 °, increasing east is east latitude, increasing west is west latitude), such as determining the location of Beijing (40 ° N, 116 ° E). 2. * * Indian geographical knowledge ** - India's climate was dominated by tropical monsoons. Except for a small range of plateau climate, mountain climate, and tropical desert climate, most areas had high temperatures throughout the year, and the year was divided into two seasons of drought and rain. The rainy season is the southwest wind from June to September, and the dry season is the northeast wind from October to May of the following year. The instability of the southwest wind may lead to floods or droughts. - The terrain of India was mountainous in the north (the Himalayas), plains in the middle (the Ganges Plain), and highlands in the south (the Deccan Plateau). Rivers such as the Ganges flowed into the Bay of Bengal. India was bordered by the Bay of Bengal in the east and the Arabian Sea in the west. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Seventh grade biological carbon dioxide photosynthesis experiment
The following is an experiment in seventh grade biology to verify that carbon dioxide is the raw material for photosynthesis: ** 1. Experimental Materials and Tools ** 1. [Plant Material: Geraniums (You can also choose other suitable green plants)] 2. ** Reagents **: Alkaline solution, clean water, and iodine-based solution. 3. ** Other appliances **: transparent glass bell jar (or other sealable transparent containers), small beakers, large beakers, etc. ** 2. Experimental Steps ** 1. ** Dark processing ** - He chose two geraniums that grew in similar conditions and placed them in the dark for a day. The purpose was to transport or consume the original starch in the geraniums leaves to avoid the interference of the original starch on the experimental results. 2. ** Setting up Control Experiment ** - He placed the geraniums in two transparent glass jars. A small beaker filled with a solution of soda was placed in one glass bell jar, and a small beaker filled with an equal amount of clear water was placed in the other glass bell jar. Here, device 1 (with a solution of soda ash) would absorb carbon dioxide. Device 2 (with clean water) could be used as a reference to ensure that other than the variable of carbon dioxide, the other conditions were the same. 3. ** Sunlight shines ** - The two devices were placed under the sun for a period of time to allow the plants to photosynthesize. 4. ** Alcohol Decolorization ** - He prepared a large beaker to be filled with water and a small beaker to be filled with alcohol. He placed the illuminated leaves into the alcohol in the small beaker, and then placed the small beaker into the large beaker to heat it up. The effect of the alcohol was to dissolve the leave's fluorescence, which would make it easier to observe the color change later. During the process of heating, the color of the alcohol would gradually turn green as the photosynthesis dissolved, and the color of the leaves would turn from green to yellow-white. 5. ** Wash with water ** - He rinsed the leaves with water to wash away the alcohol on the leaves. 6. ** Drop in the solution ** - The rinsed leaves were dripped with an iodine-based solution. The purpose of adding the solution was to check if there was starch in the leaves. 7. ** Once again rinse with water ** - He rinsed the leaves with water again to observe the color change more clearly. ** 3. Experimental phenomena and conclusions ** 1. ** Phenomenon ** - The leaves in Device 1 (with a solution of soda and no carbon dioxide) did not turn blue, while the leaves in Device 2 (with water and carbon dioxide) turned blue. 2. ** conclusion ** - The starch was the product of photosynthesis, and carbon dioxide was the raw material of photosynthesis. Other experiments could also be used to verify that carbon dioxide was a raw material for photosynthesis. For example, similar devices could be made in two glass tanks. One tank was used to remove carbon dioxide with a solution of soda, and the other tank was filled with normal air. After dark treatment, illumination, and testing for starch, the same conclusion could be reached. In addition, the experiment using hornworts and BTL solution could also indirectly prove that carbon dioxide was a raw material for photosynthesis. Put hornworts into test tubes A and B, and add an equal amount of yellow-green BTL solution (which will change color after blowing with carbon dioxide) and plug it. Test tube A is placed under the sun, and test tube B is wrapped in black paper and placed in a dark place. After a period of time, the solution in test tube A will turn blue (carbon dioxide is absorbed by photosynthesis), and the solution in test tube B will still be yellow-green. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Seventh grade biological literacy test paper and answers
Seventh grade first volume biological organic matter knowledge points
1. ** The definition and composition of organic matter ** - The organic matter contained carbon and could be burned. For example, in cells, sugar, fat, protein, and DNA were all organic substances, and they were also large molecules. 2. ** Knowledge related to organic matter in green plants ** - In the experiment of green plants producing organic matter, starch was the product of photosynthesis. Through dark processing (Put it in the dark for a day and a night to remove the original starch in the leaves and exhaust it), select leaves to shade (To form a control experiment, the variable is light), sunlight exposure, alcohol detoxification (alcohol acts to dissolve the photosynthesis, and heating with water to prevent the alcohol from evaporating and burning, the color of the alcohol changes from colorless to green, and the color of the leaves changes from green to yellow-white), rinsing with clear water, dripping with iodination solution (to verify whether there is starch formation), rinsing with clear water, and so on. The conclusion can be drawn that starch is a product of photosynthesis and plants require light for photosynthesis. - The reaction formula for photosynthesis was carbon dioxide + water, organic matter (which stored energy)+ oxygen. The organic matter here was the product of photosynthesis. The raw materials of photosynthesis were carbon dioxide and water. The condition was light, and the place was the plastids. The essence of photosynthesis was to produce organic matter and store energy. - At the cellular level, organic matter constructs the plant body, such as the fiber in the cell wall, the protein and fat in the cell membrane, and the DNA in the nucleus. 3. ** Knowledge related to organic matter in the ecosystem ** - In an ecosystem, producers (usually green plants) can produce organic matter for themselves and other organisms to use. The organic matter flowed along the food chain and food web. The matter could be recycled, but the energy flowed in one direction and decreased step by step. At the same time, harmful substances gradually accumulate along the food chain. The higher the nutritional level, the more toxic substances (bioconcentration). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the definition of biological cell organ histology?
1. [Cell: The basic structural and functional unit of an organism.] Other than viruses, all living things were composed of cells. The life activities of viruses also needed to be reflected in cells. There were two types of cells: prokaryonic cells and eukaryonic cells. There were also people who proposed to separate the archaic cells as a separate type. A cell is generally composed of a nucleus and a plasma. There is a cell membrane on the outside. Higher plant cells have a cell wall outside the cell membrane. There are often plastids (such as plastids), vesicles, mitochondria, etc. in the plasma. Animal cells have no cell wall, and there are often center-like bodies in the plasma. The cells had the functions of movement, nutrition, reproduction, and so on. 2. [** tissue **: A combination of a group of cells and intercellular substances with similar shapes and functions.] There were four basic tissues in higher animals (or human bodies), namely, the epiphyte tissue (cells arranged tightly, with protective and secretion functions), the Connective tissue (widely distributed, with support, connection, protection, nutrition, and other functions), the nervous tissue (composed of neurons, which consisted of two parts, the cell body and the process. The cell body processed information, and the process transmitted information), and the muscle tissue (slender cells with contraction and relaxation characteristics). Plants also had a variety of tissues, such as meristematic tissues (with cell division and differentiation functions), protective tissues (cells arranged tightly and cell walls relatively developed), conducting tissues (such as vessels and sieve tubes), etc. 3. ** organ **: It is a structure composed of different cells and tissues in an animal or plant body. It is used to complete certain specific functions and forms various systems (animal body) or the entire individual (plant body) together with other organs that share the same function. For example, plants had roots, stems, leaves, flowers, fruits, seeds, and other organs. Animals 'small intestines, lungs, and hearts were all organs. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What are the system structures of seventh grade biology?
The human body of the seventh-grade biology students was made up of eight major systems, namely the reproductive system, digestive system, respiratory system, circulatory system, urological system, nervous system, hormonal system, and motor system. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the ability of a seventh-grade spirit medium in the sorcerer system?
Being able to manipulate corpses and ghosts, both Da Feng and the demons in the north had suffered greatly from the Spirit Medium on the battlefield.
How to draw a good mind map for the first volume of the seventh grade's biological transpiring
Here's a way to create a Mind Map for the first volume of the seventh grade's Bio-Transpiration: ** 1. Central theme ** 1. Write the central theme of 'transpirations' in the center of the paper. You can use larger font or special designs (such as artistic words) to highlight it. ** 2. Main Branch ** 1. ** Concept ** - Extending from the central theme was a branch that read,"Concept: The process of water vapor dissipating from the surface of living plants (mainly leaves) into the atmosphere." It could be summarized in simple words, such as "plant surface → water vapor → atmosphere", and a small icon of water vapor released by a plant leaf (such as a simple water vapor arrow floating up from the leaf). 2. ** The process ** - The other branch was labeled "process." - It was further divided into many small branches, listed in the order of "moisture in the soil, root hair, root vessels, stem vessels, leaf vessels, stomata, atmosphere". Each link could be connected by an arrow, and a simple sketch representing the structure could be drawn next to the corresponding small branch (such as drawing some fine hair-like lines on the root hair, drawing some tube-like structures on the vessel, drawing a small hole between the two guard cells on the stomata, etc.). 3. ** Place ** - The branch was marked with the word "venue". - It was divided into "mainly through the stomata of the leaves, and a small amount is also carried out on the petioles and young stems". In the "stomata of the leaves", an enlarged stomatal structure could be drawn, and in the "petioles and young stems", a small section of the stem and petioles could be drawn. 4. ** Meaning ** - He drew the "meaning" branch. - He listed the contents such as "1) Lowering the temperature of the plant, 2) Enhancing the absorption of water from the soil by the roots, 3) Enhancing the transport of water and mineral salt" and "Green plants participate in the water cycle of the biosphere, increasing the humidity of the atmosphere, increasing rainfall, and improving the climate." For lowering the temperature, you could draw an icon of a thermometer showing a decrease in temperature. For promoting the root to absorb water, you could draw a small picture of the root absorbing water into the soil. For promoting transport, you could draw a pipe with an arrow to indicate the transport of materials. For participating in the water cycle, you could draw a simple picture of the Earth and the water vapor cycle. ** 3. Color and layout ** 1. Different colors could be used to distinguish different branches. For example, concepts were blue, processes were green (because they were related to the growth process of plants), places were yellow, and meanings were red. 2. Try to maintain a balance between the branches, don't let a branch be too crowded or empty, and the entire mind map can present a radioactive structure that spreads evenly from the central theme to the surroundings. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Seventh-grade Divine Title
Seventh-grade clergymen referred to the hierarchy of clergymen in the Church. During the 1947-1972 Holy Control period, the Roman Roman Church divided the priesthood into seven levels: First Class Clerics, Second Class Clerics, Third Class Exorcists, Fourth Class Deacons, Fifth Class Assistant Deacons, Sixth Class Deacons, and Seventh Class Priests (including priests and bishops). After 1972, the Church abolished the seventh-grade priesthood system and implemented a three-level priesthood system consisting of deacons, priests, and bishops. Other low-level positions could be taken up by laymen.