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Chapter 6 Biomes. 6-1 How are organisms on Earth connected?

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Presentation on theme: "Chapter 6 Biomes. 6-1 How are organisms on Earth connected?"— Presentation transcript:

1 Chapter 6 Biomes

2 6-1 How are organisms on Earth connected?

3 Connections in the Biosphere  The biosphere is the part of Earth in which living things are found.  All organisms share earth’s resources, such as water, air, and light.  The study of how living things interact with each other and their environment is called ecology.

4 Organization of the Biosphere  An environment includes both living and nonliving parts.  A population is a group of individuals that belong to the same species and live in the same area.  Every member of a population needs food, water, air, space, shelter, and other resources.

5  A community is a group of populations that interact with each other in a particular area.  An ecosystem is a community of organisms living together along with the nonliving parts of the environment.  An ecosystem can be as small as a crack in a sidewalk or as large as a forest.

6 Meeting the Needs of Organisms  Abiotic factors are the nonliving parts of an ecosystem:  Water  Sunlight  Temperature  Soil  Air

7  The amount of water in an ecosystem can limit the number of organisms it can support.  Since plants need sunlight for photosynthesis, sunlight is important to all living things.  The amount of sunlight an area receives determines the kind of plants that grow there.  The temperature of an area also determines what organisms live there.  Biotic factors are the living organisms in an ecosystem.

8 Adaptations  Biotic and abiotic factors shape the communities that live in an ecosystem.  All organisms in a particular ecosystem have adaptations that help them survive there.  An adaptation is a characteristic that helps an organism live and reproduce in a particular environment.

9 Chapter 6 Lesson 2 What are Earth’s biomes?

10 Climate and Biomes  Similar communities occur in places that have similar climates and landforms.  A biome is a large group of ecosystems with similar climates and organisms.  Climate is the average yearly temperature and precipitation in an area.

11  A tropical rain forest has wet, humid conditions and long periods of sunlight that make it an ideal place for large trees and other plants to grow.  Trees block some sunlight and help make different environments within the rain forest.  Scientists estimate that at least two million species live in Earth’s rain forests.

12  Trees do not grow in cold climates, but you will find mosses and small shrubs.  Grasslands bet about 60 cm of precipitation a year. Therefore very few trees grow there.

13 Characteristics of Biomes  Climate is an important factor in determining which organisms can live in an area.  Soil varies from place to place, and it plays an important role in what kinds of plants can survive in an ecosystem.  Although similar biomes in different part of earth will share similar climate and organisms, there are differences.

14 Tropical Rain Forest  The tropical rain forest contain more species than any other biome.  More than half of the rain forests have been destroyed.

15 Deciduous Forest  The most common plants are deciduous trees.  Deciduous trees shed their leaves each year and then grow new ones.  As the forest trees lose their leaves each year, the fall to the ground and decay.  The soil is nutrient rich in a deciduous forest due to the decaying leaves that have fallen.

16 Taiga  Conifers, such a fir, spruce, and hemlock, are some of the plants that have adapted to the poor soil and long cold winters of the taiga.  The taiga is also called the boreal forest or coniferous forest.

17 Grassland  Grasslands do not get enough rain to have large trees growing in them.  The grasslands has some of the most fertile soil and is an excellent place for farming.  Some of the largest animal on Earth live on grasslands including bison, zebras, rhinoceros, and giraffes.

18 Tundra  The tundra has a permafrost which is a layer of permanently frozen soil just beneath the surface.  The cold temperatures, high winds, and short growing season limit plant growth to short shrubs, grasses, mosses, and a few very short trees.  Foxes, lemmings, hares, and caribou are a few of the common animals.

19 Desert  All desert are not hot. Many deserts can be quite cool, especially at night.  The characteristic that is common to all deserts is that they are dry.  Desert plants include cacti and other plants that have short growth cycles.  Many animals are active at night when the temperatures are cooler.


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