Презентация к уроку по биологии (9 класс) на тему: презентация «Ядро, органоиды клетки»

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Ядро, органоиды клетки.

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Ядро – важнейшая структура клетки. В нем сосредоточено 90% клеточной ДНК. Шаровидная или овальная форма. кариолема Кариоплазма Хроматин Ядрышки Поры

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Клетки эукариот обычно имеют 1 ядро, но бывают и исключения. На стр. 58. Найдите примеры организмов имеющих 2 и более ядер. Какие клетки относящиеся к группе эукариот не имеют ядер и почему? Как располагаются ядра в клетках разных организмов? Каковы размеры клеточных ядер, от чего это зависит?

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Внутренняя мембрана – гладкая, а наружная переходит в каналы эндоплазматической сети. Общая толщина двумембранной ядерной оболочки составляет 30 нм. Кариолема

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Кариоплазма – Что собой представляет? Чем образована? Что такое хроматин? Что такое спирализация хромосом? Когда она происходит? Какую роль в этом процессе играют белки – гистоны?

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Хромосомы Органоиды ядра эукариот, каждая хромосома образована одной молекулой ДНК и молекулами белков – гистонов. Носители генетической информации Каково значение сперализации и деспирализации хромосом?

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Страница 59. Что такое ядрышко , как оно образуется? Какова функция ядрышек в жизни клетки?

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Хромосомный набор клетки – кариотип. Кариотип организмов уникален – у каждого организма свой неповторимый хромосомный набор клетки.

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Клетки организма Соматические Половые Ядра соматических клеток содержат двойной набор хромосом ( Диплоидный – т.е. по 2 хромосомы одинакового типа) Гомологичные хромосомы – парные, абсолютно одинаковые (одна от отца, другая от матери) Половые клетки содержат одинарный набор хромосом ( гаплоидный )

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Цитоплазма клетки Гиалоплазма- Жидкая основа цитоплазмы, состоящая из воды. Белков и неорганических веществ.

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Опорная система клеток эукариот Микротрубочки Промежуточные филаменты Микрофиламенты

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Клеточный центр — центросома Расположен вблизи ядра Образован центриолями, центриоли расположены перпендикулярно друг другу, состоят из 9 триплетов микротрубочек (белок тубулин)

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Рибосомы

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Схема строения рибосомы 1 — малая субъединица 2 — иРНК 3 — тРИК 4 — аминокислота 5 — большая субъединица 6 — мембрана эндоплазматической сети 7 — синтезируемая полипептидная цепь.

90000 PPT — Grade 9 BIOLOGY PowerPoint Presentation, free download 90001 90002 90003 90004 Grade 9 BIOLOGY 90005 Sustainable Ecosystems 90006 90007 90008 90003 90004 Ecology is the scientific study of the abundance and 90005 distribution of organisms, and of their interactions with their environment • Oikos = house • Logos = to study 90006 90007 90014 90003 90004 Ecology uses the scientific method of hypotheses and 90005 deductions. • Good hypotheses generate predictions that can be tested.• Experiments are designed to test the hypotheses. • If the data gathered does not support the hypothesis, it is refuted or falsified. • An experiment can not prove a hypothesis to be true — rather they become strong hypotheses if multiple experiments fail to refute them. 90006 90007 90020 90003 90004 Robert T. Paine 90005 • Zoologist Robert T. Paine, who coined the term «keystone species,» had an unorthodox way of doing his work. • It was unorthodox at the time because most ecologists simply observed and measured factors in nature and tried to make conclusions from these.90006 90007 90026 90003 90004 Paine’s experiment 90005 • Instead of just observing the habitat of the Pisaster ochraceus sea star, Paine experimented by changing the habitat. • Paine and his students from the University of Washington spent 25 years removing the starfish from a tidal area on the coast of Tatoosh Island, Washington, in order to see what happened to other species when they were gone. 90006 90007 90032 90003 90004 The sea stars are a major predator for mussels on Tatoosh 90005 Island.• With the sea stars gone, mussels took over the area and crowded out other species. • In this ecosystem, the sea star was the keystone species. 90006 90007 90038 90003 90004 Ecology is exciting! 90005 • Ecology has a long history of being a historical science, and has only started to become an experimental science in the last 50 — 60 years. • Many old ideas have not had a chance to be tested thoroughly • This makes ecology an exciting field of study, because new discoveries can have an enormous impact 90006 90007 90044 90003 90004 Experimental Lakes Area 90005 • World renowned Canadian institution • Only place in the world capable of doing long-term, whole-ecosystem experiments • Have studied such topics as: • Effects of synthetic hormones on fish • Impacts of flooding soils on mercury contamination of fish • How changing nutrient balance in freshwater lakes affect blooms of toxic algae • How acid rain affects lake ecosystems 90006 90007 90050 90003 90004 Environment 90005 • What is meant when we say that organisms interact with their «environment»? • The environment includes both biotic and abiotic components.• Biotic components are the living aspects of the environment — other members of the same species and members of other species. 90006 90007 90056 90003 90004 Examples of biotic factors 90005 • Mice must be constantly vigilant to avoid predation by owls and snakes • Mice must also compete with other mice for resources such as habitat space, food and water, and access to potential mates 90006 90007 90062 90003 90004 Abiotic factors 90005 • Abiotic components are the non-living factors or conditions which are unique to the ecosystem.• These are usually conditions such as the amount of rainfall, sunlight levels, wind speed, soil temperature, nutrient levels, oxygen concentration, type of substrate 90006 90007 90068 90003 90004 Biotic and abiotic factors 90005 90006 90007 90074 90003 90004 Levels of organization 90005 • Depending on the question asked, an ecologist might investigate at one or more of the following levels: • Individuals • Populations • Communities • Ecosystems 90006 90007 90080 90003 90004 Individuals 90005 • A single member of a species • Sometimes this is difficult to define • Eg : a colony of quaking Aspen (Populus tremuloides) in Utah has been determined to be part of a single living organism, with an interconnected root system.This makes it the heaviest organism on the planet, estimated at 6000 tonnes. It is also likely the oldest organism on the planet, approximately 80,000 years old. • Eg: similarly, the honey mushroom colony is known to cover 8.9 km2 of forest in Oregon, making it the largest organism on the earth by area • Q: How does a cave cricket find its way in and out of it’s dark cave when it comes out to forage for food? 90006 90007 90086 90003 90004 Populations 90005 • Groups of the same species living in one area • a herd of caribou • a flock of Canada geese • the E.coli bacteria living in a person’s gut • all of the smallmouth bass living in a lake • They may compete for resources, and are also more likely to combine their genes during reproduction than with members of other populations 90006 90007 90092 90003 90004 Populations 90005 • Population ecologists ask questions at this level • Often the questions are about abundance, density, population growth and limits on growth Q: How does deforestation in Costa Rica affect the maximum number and the nesting success of migrating songbirds? 90006 90007 90098 90003 90004 Communities 90005 • Groups of different species living in the same area.• Different species have different roles or ‘functions’ in a community • Eg: some act as producers, others are consumers and still others are decomposers 90006 90007 90104 90003 90004 Communities 90005 • Imagine a herd of caribou • Now include the two species of grass that it feeds on in the tundra • Now picture the many other species of sedges and grasses that they trample in the process of grazing • Now imagine the species of beetles that feed on the same species of grasses, the soil microorganisms, the ticks that live on the hide of the caribou, and the birds that feed on those ticks, and the beetles that feed on the dung of the caribou • This is a very simplified picture of a tundra community Q: How does the presence of (or absence) of a tick fungus affect the survival of a population of caribou? 90006 90007 90110 90003 90004 Ecosystems 90005 • Ecosystems are assemblages of interacting communitites in the same general area, as well as the abiotic factors that are important for sustaining life.• Ecosystems can be nested within other ecosystems. • The size of an ecosystem can be as large as a national park, or as small as a rotting log. 90006 90007 90116 90003 90004 An Ecosytem ecologist might ask: 90005 • What role do insect populations play in the health of salmon, bear and coniferous trees in coastal ecosystems. OR • What role do the nutrients in bat guano (feces) play in the support of nonphotosynthetic ecosystems in caves? 90006 90007 90122 90003 90004 Sustainability 90005 • Most natural ecosystems are sustainable • This means they have the ability to maintain natural ecological conditions or processes without interruption, weakening, or loss of value indefinitely • Artificial ecosystems are usually not sustainable • They require input of energy to maintain the biotic and abiotic factors 90006 90007 90128 90003 90004 Energy in Ecosytems 90005 • All organisms need energy to survive and to function — energy is ability to do work, such as grow, repair, search for mates, search for food • Ultimately, all of the energy on earth came from the sun! • But only a small part of the sun’s energy is actually used directly by organisms.• 30% is reflected by clouds back into space • The other 70% is absorbed by the lithosphere, atmosphere and hydropshere • This is important because it warms the earth, and produces weather and climate patterns 90006 90007 90134 90003 90004 Energy in Ecosystems 90005 • Only a very small percentage of that 70% is used for photosynthesis: ~ 0.023% • Producers convert the sun’s energy into chemical potential energy — into molecules of sugar in a process called photosynthesis • Both producers and consumers break these sugars down using their mitochondria in a process called cellular respiration • This allows them to use the energy stored in the sugars to grow and reproduce 90006 90007 90140 90003 90004 Photosynthesis and Cell respiration 90005 • Photosynthesis: carbon dioxide + water sugar + oxygen • Cell respiration: sugar + oxygen carbon dioxide + water 90006 90007 90146 90003 90004 Energy flow in a food chain 90005 • Consider the following food chain: Pine co ne (seeds) red squirrel weasel goshawk • In this food chain, some of the chemical energy stored in the pine cone is passed through the red squirrel on into the weasel and finally to the goshawk.• In a food chain, only about 10% of the energy gained and used by one level is passed on to the next • Of all of the energy the pine tree has absorbed over its lifetime, only some of it is now stored in the tissues of the tree — most of it has been converted into heat and can never be used by other organisms 90006 90007 90152 90003 90004 Food Webs 90005 • Food chains do not exist in nature — instead they are part of a much larger food web — even this example is greatly simplified 90006 90007 90158 90003 90004 Trophic Levels 90005 90006 90007 90164 90003 90004 Food Webs 90005 90006 90007 90170 90003 90004 Trophic Levels 90005 0.01% 0.1% 1% 10% 100% ~ 90% energy lost as heat ~ 90% energy lost as heat ~ 90% energy lost as heat ~ 90% energy lost as heat ~ 90% energy lost as heat 90006 90007 90176 90003 90004 Energy is lost at each level 90005 • This bull has eaten 100 kJ of stored energy in the form of grass, and excreted 63 kJ in the form of feces, urine and gas. The energy stored in its body tissues is 4 kJ. So how much has been used up in respiration? • The energy released by respiration = 100 — 63 — 4 = 33 kJ • Only 4 kJ of the original energy available to the bullock is available to the next stage, which might be humans.The efficiency of this energy transfer is: • efficiency = 4/100 × 100 = 4% 90006 90007 90182 90003 90004 What should we be eating? 90005 90006 90007 90188 90003 90004 Pyramid of energy 90005 90006 90007 90194 90003 90004 Pyramid of numbers 90005 90006 90007 90200 90003 90004 Pyramids 90005 90006 90007 90206 90003 90004 Cycling of Matter 90005 90006 90007 90212 90003 90004 Carbon Cycle 90005 90006 90007 90218 90003 90004 Nitrogen Cycle 90005 90006 90007 90224 90003 90004 Phosphorus Cycle 90005 90006 90007 90230 90003 90004 Biotic and Abiotic Factors 90005 • Abiotic factors will determine which species can live in an ecosystem • e.g .: cactus will thrive in desert, but maple trees will not • All species have a range of tolerance • Outside this range of an abiotic factor such as temperature, there is a zone of stress • Outside this range, there is a zone of intolerance 90006 90007 90236 90003 90004 Range of Tolerance 90005 90006 90007 90242 90003 90004 Distribution of a species 90005 • Each ecosystem has a set of abiotic factors that allow certain species to live 90006 90007 90248 90003 90004 Biotic Factors 90005 • The species that live or colonize an area can determine the characteristics of that area as well • Grass plants produce no shade, but oak trees do • Lichen can gradually erode rock to form soil, changing the types of plants that can live in an area.90006 90007 90254 90003 90004 Carrying Capacity 90005 • The upper limit of organisms that an ecosystem can support for an unlimited amount of time • As population size increases, competition for resources increases • Individuals become more susceptible to predation and disease • Carrying capacity can change because environmental conditions can change 90006 90007 90260 90003 90004 Carrying Capacity 90005 90006 90007 90266 90003 90004 Biotic Interactions 90005 • Competition: between species, or within species • Predation: lynx-hare, owl-vole • Symbiosis: • Parasitism: brown cowbird • Mutualism: lichen — algae and fungus • Commensalism: caribou and mice 90006 90007 90272 90003 90004 Terrestrial Ecosystems 90005 • A biome is a large geographic area that has a characteristic climate (temperature and precipitation) and set of biotic and abiotic features • In Canada, there are four major biomes • Temperate deciduous forest • Boreal forest • Grassland • Mountain forest • Tundra 90006 90007 Load More….90000 PPT — Grade 9 BIOLOGY PowerPoint Presentation, free download 90001 90002 90003 90004 Grade 9 BIOLOGY 90005 Sustainable Ecosystems 90006 90007 90008 90003 90004 Ecology is the scientific study of the abundance and 90005 distribution of organisms, and of their interactions with their environment • Oikos = house • Logos = to study 90006 90007 90014 90003 90004 Ecology uses the scientific method of hypotheses and 90005 deductions. • Good hypotheses generate predictions that can be tested.• Experiments are designed to test the hypotheses. • If the data gathered does not support the hypothesis, it is refuted or falsified. • An experiment can not prove a hypothesis to be true — rather they become strong hypotheses if multiple experiments fail to refute them. 90006 90007 90020 90003 90004 Zonosemata wing markings 90005 • Observation: Zonosemata flies have dark bands on their wings — they wave them up and down when disturbed. • Erick Green asked the question: «How could this behaviour evolve by natural selection?» * * Science 17 April 1987: Vol.236. no. 4799, pp. 310 — 312 90006 90007 90026 90003 90004 Three hypotheses 90005 • Wing patterns and displays evolved by sexual selection (attracting mates). • Wing patterns and displays evolved to scare predators by mimicking jumping spiders. • Wing patterns and displays evolved to discourage predation by jumping spiders themselves. 90006 90007 90032 90003 90004 Experimental Groups 90005 • Greene created five experimental groups: • Untreated zonosemata flies (controls) • Zonosemata with their own wings re-glued in place • Zonosemata with housefly wings glued in place • Houseflies with zonosemata wings glued in place • Untreated houseflies • He then subjected each group to starved jumping spiders and other predators (Anole lizards), repeated each trial 20 times, and measured how many times spiders or other predators attacked or retreated.90006 90007 90038 90003 90004 Predictions 90005 • Hypothesis # 1 — all flies should be attacked • Hypothesis # 2 — jumping spiders should attack all groups — other predators should attack groups 3 — 5, but leave 1 and 2 alone. • Hypothesis # 3 — other predators will attack all groups — jumping spiders will avoid groups 1 and 2 but leave others alone 90006 90007 90044 90003 90004 What does this data suggest? 90005 Number of flies killed by predators (out of 20 trials). 90006 90007 90050 90003 90004 Ecology is exciting! 90005 • Ecology has a long history of being a historical science, and has only started to become an experimental science in the last 50 — 60 years.• Many old ideas have not had a chance to be tested thoroughly • This makes ecology an exciting field of study, because new discoveries can have an enormous impact 90006 90007 90056 90003 90004 Environment 90005 • What is meant when we say that organisms interact with their «environment»? • The environment includes both biotic and abiotic components. • Biotic components are the living aspects of the environment — other members of the same species and members of other species. 90006 90007 90062 90003 90004 Examples of biotic factors 90005 • Mice must be constantly vigilant to avoid predation by owls and snakes • Mice must also compete with other mice for resources such as habitat space, food and water, and access to potential mates 90006 90007 90068 90003 90004 Abiotic factors 90005 • Abiotic components are the non-living factors or conditions which are unique to the ecosystem.• These are usually conditions such as the amount of rainfall, sunlight levels, wind speed, soil temperature, nutrient levels, oxygen concentration, type of substrate 90006 90007 90074 90003 90004 Biotic and abiotic factors 90005 90006 90007 90080 90003 90004 Levels of organization 90005 • Depending on the question asked, an ecologist might investigate at one or more of the following levels: • Individuals • Populations • Communities • Ecosystems 90006 90007 90086 90003 90004 Individuals 90005 • A single member of a species • Sometimes this is difficult to define • Eg : a colony of quaking Aspen (Populus tremuloides) in Utah has been determined to be part of a single living organism, with an interconnected root system.This makes it the heaviest organism on the planet, estimated at 6000 tonnes. It is also likely the oldest organism on the planet, approximately 80,000 years old. • Eg: similarly, the honey mushroom colony is known to cover 8.9 km2 of forest in Oregon, making it the largest organism on the earth by area • Q: How does a cave cricket find its way in and out of it’s dark cave when it comes out to forage for food? 90006 90007 90092 90003 90004 Populations 90005 • Groups of the same species living in one area • a herd of caribou • a flock of Canada geese • the E.coli bacteria living in a person’s gut • all of the smallmouth bass living in a lake • They may compete for resources, and are also more likely to combine their genes during reproduction than with members of other populations 90006 90007 90098 90003 90004 Populations 90005 • Population ecologists ask questions at this level • Often the questions are about abundance, density, population growth and limits on growth Q: How does deforestation in Costa Rica affect the maximum number and the nesting success of migrating songbirds? 90006 90007 90104 90003 90004 Communities 90005 • Groups of different species living in the same area.• Different species have different roles or ‘functions’ in a community • Eg: some act as producers, others are consumers and still others are decomposers 90006 90007 90110 90003 90004 Communities 90005 • Imagine a herd of caribou • Now include the two species of grass that it feeds on in the tundra • Now picture the many other species of sedges and grasses that they trample in the process of grazing • Now imagine the species of beetles that feed on the same species of grasses, the soil microorganisms, the ticks that live on the hide of the caribou, and the birds that feed on those ticks, and the beetles that feed on the dung of the caribou • This is a very simplified picture of a tundra community Q: How does the presence of (or absence) of a tick fungus affect the survival of a population of caribou? 90006 90007 90116 90003 90004 Ecosystems 90005 • Ecosystems are assemblages of interacting communitites in the same general area, as well as the abiotic factors that are important for sustaining life.• Ecosystems can be nested within other ecosystems. • The size of an ecosystem can be as large as a national park, or as small as a rotting log. 90006 90007 90122 90003 90004 Ecosystems 90005 • An ecosytem ecologist might ask the following questions: • What role do insect populations play in the health of salmon, bear and coniferous trees in coastal ecosystems? • What role do the nutrients in bat guano (feces) play in the support of nonphotosynthetic ecosystems in caves? 90006 90007 90128 90003 90004 Energy in Ecosytems 90005 • All organisms need energy to survive and to function — energy is the ability to do work, such as grow, repair, search for mates, search for food — your cells are using energy right now to learn about ecology • Ultimately, all of the energy on earth came from the sun! • But only a small part of the sun’s energy is actually used directly by organisms.• 30% is reflected by clouds back into space • The other 70% is absorbed by the lithosphere, atmosphere and hydrosphere • This is important because it warms the earth, and produces weather and climate patterns 90006 90007 90134 90003 90004 Energy in Ecosystems 90005 • Only a very small percentage of that 70% is used for photosynthesis: ~ 0.023% • Producers convert the sun’s energy into chemical potential energy — into molecules of sugar in a process called photosynthesis • Both producers and consumers break these sugars down using their mitochondria in a process called cellular respiration • This allows them to use the energy stored in the sugars to grow and reproduce 90006 90007 90140 90003 90004 Photosynthesis and Cell Respiration 90005 • Photosynthesis: Carbon dioxide + water sugar + oxygen • Cell respiration: Sugar + oxygen carbon dioxide + water 90006 90007 90146 90003 90004 Energy flow in a food chain 90005 • Consider the following food chain: Pine con e (seeds) red squirrel weasel goshawk • In this food chain, some of the chemical energy stored in the pine cone is passed through the red squirrel on into the weasel and finally to the goshawk.• In a food chain, only about 10% of the energy gained and used by one level is passed on to the next • Of all of the energy the pine tree has absorbed over its lifetime, only some of it is now stored in the tissues of the tree — most of it has been converted into heat and can never be used by other organisms 90006 90007 90152 90003 90004 Food Webs 90005 • Food chains do not exist in nature — instead they are part of a much larger food web — even this example is greatly simplified 90006 90007 90158 90003 90004 Trophic Levels 90005 90006 90007 90164 90003 90004 Food Webs 90005 90006 90007 90170 90003 90004 Trophic Levels 90005 0.01% 0.1% 1% 10% 100% ~ 90% energy lost as heat ~ 90% energy lost as heat ~ 90% energy lost as heat ~ 90% energy lost as heat ~ 90% energy lost as heat 90006 90007 90176 90003 90004 Energy is lost at each level 90005 • This bull has eaten 100 kJ of stored energy in the form of grass, and excreted 63 kJ in the form of feces, urine and gas. The energy stored in its body tissues is 4 kJ. So how much has been used up in respiration? • The energy released by respiration = 100 — 63 — 4 = 33 kJ • Only 4 kJ of the original energy available to the bullock is available to the next stage, which might be humans.The efficiency of this energy transfer is: • efficiency = 4/100 × 100 = 4% 90006 90007 90182 90003 90004 What should we be eating? 90005 90006 90007 90188 90003 90004 Pyramid of energy 90005 90006 90007 90194 90003 90004 Pyramid of numbers 90005 90006 90007 90200 90003 90004 Pyramids 90005 90006 90007 90206 90003 90004 Cycling of Matter 90005 90006 90007 90212 90003 90004 Carbon Cycle 90005 90006 90007 90218 90003 90004 Nitrogen Cycle 90005 90006 90007 90224 90003 90004 Phosphorus Cycle 90005 90006 90007.90000 PPT — Biology Learning Standards for Grade 9 or 10 PowerPoint presentation | free to view 90001 PowerShow.com is a leading presentation / slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.com is a great resource. And, best of all, most of its cool features are free and easy to use. 90002 You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free.Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows — with 2D and 3D transitions, animation, and your choice of music — that you can share with your Facebook friends or Google+ circles.That’s all free as well! 90003 90002 For a small fee you can get the industry’s best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it’s free. We’ll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today — for FREE. There is truly something for everyone! 90005 90003 presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world.Or use it to create really cool photo slideshows — with 2D and 3D transitions, animation, and your choice of music — that you can share with your Facebook friends or Google+ circles. That’s all free as well! 90002 For a small fee you can get the industry’s best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it’s free. We’ll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides.All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today — for FREE. There is truly something for everyone! 90005 90003 .90000 PPT — Biology -9 th Grade PowerPoint Presentation, free download 90001 90002 90003 90004 Biology -9th Grade 90005 90006 90007 90008 90003 90004 CHAPTER 5 NOTES 90005 90006 90007 90014 90003 90004 CHARACTERISTICS OF A POPULATION 90005 • DENSITY • GROWTH RATE • GEOGRAPHIC DISTRIBUTION 90006 90007 90020 90003 90004 3 FACTORS THAT AFFECT POPULATION 90005 • # OF BIRTHS • # OF DEATHS • # OF IND. THAT ENTER AND LEAVE A POPULATION 90006 90007 90026 90003 90004 2 TYPES OF POPULATION GROWTH 90005 90006 90007 90032 90003 90004 EXPONENTIAL GROWTH 90005 POPULATION GROWS EXTREMELY RAPID AND AT A CONSTANT RATE 90006 90007 90038 90003 90004 LOGISTICGROWTH 90005 DOES HAVE A PERIOD OF EXP.GROWTH, BUT WILL STOP OR SLOW DOWN. GOES THROUGH A # OF PHASES. * Carrying capacity — total # of individuals a pop. can support 90006 90007 90044 90003 90004 LIMITING FACTOR 90005 FACTOR THAT CAUSES THE POPULATION TO DECREASE 90006 90007 90050 90003 90004 Density-Dependent Limiting Factors 90005 • Factors that depend on the size of a population • Examples — Competition, predation, disease, parasitism 90006 90007 90056 90003 90004 Density-Independent Limiting Factors 90005 • Affect all pop.regardless of pop. size. Examples — Natural disasters, Weather, and human activities 90006 90007 90062 90003 90004 QUIZ — CH. 5 90005 • List 3 factors that affect population growth. • What are 3 characteristics of a population? • What type of growth goes through a period of rapid growth, and slows down or stops? 90006 90007 90068 90003 90004 4. What is the term for the largest # of individuals a 90005 population can hold? 5. What type of growth grows at a constant rate? 6. List some density-dependent limiting factors.7. List some density-independent limiting factors. 90006 90007 90074 90003 90004 This powerpoint was kindly donated to 90005 www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching. 90006 90007.