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"Ecological Pyramid" PPT Courseware 2
ecological pyramid
Big fish eat small fish, small fish eat shrimps, shrimps eat plankton, plankton eat green algae... There is a food chain in the biological world. When you look at the food chain, you will find an interesting phenomenon: the higher up, the fewer the number of organisms; the further down, the greater the number of organisms.
Weeds are the most numerous organisms, and insects such as locusts, inchworms, aphids, and beetles, as well as mammals such as voles, rabbits, antelopes, and deer, all depend on them for survival. And these herbivores are also relatively large in number. Carnivores, such as weasels, foxes, wolves, lions, and tigers, are much less common than herbivores. Beetles eat grass, spiders eat beetles, chickadees eat spiders, and hawks prey on chickadees.
Use the "example" method to explain the number of organisms in the ecological pyramid.
Explanation methods and benefits of examples
Give examples: Give actual examples to illustrate things and make the things to be explained concrete so that readers can understand. This method of explanation is called giving examples.
Benefits (function): Make the meaning of the article clearer and more vivid, making readers more understanding and persuasive.
Example: Stone arch bridges can be found almost everywhere in our country. These bridges vary in size and form, and many are stunning masterpieces. The most famous are the Zhaozhou Bridge in Zhao County, Hebei Province, and the Marco Polo Bridge in Fengtai District, Beijing.
(For example, it not only increases the credibility of the article, but also makes the article full of flesh and blood)
Column data, make comparisons and illustrate methods
For a beetle, one square meter of foraging space on the ground can meet its nutritional needs, while an eagle needs to forage within dozens of square kilometers to get enough food.
Column data description methods and benefits
Column data: Numbers are the most accurate, scientific and convincing basis for quantitatively describing the characteristics or principles of things.
For example: Zhaozhou Bridge is very majestic, with a total length of 50.82 meters, a width of 9.6 meters at both ends, and a slightly narrower middle section of 9 meters wide.
Study the fifth natural paragraph, read and think:
1.The importance of green plants?
2. What would it look like without the green plant ecological pyramid?
What does this passage tell us?
The ecological pyramid tells people that the carrying capacity of nature is limited, and it is never possible to exceed the carrying capacity to support the consumers at the top of the pyramid. Human activities must follow this natural law, otherwise, humans themselves will be punished by nature.
Read it and compare the similarities and differences between the underlined words.
(1) Beetles eat grass, spiders eat beetles, chickadees eat spiders, and hawks prey on chickadees.
Predation: usually refers to a stronger animal chasing a weaker animal and then eating it.
(2) For a beetle, one square meter of feeding space on the ground can meet its feeding needs.
Feeding: It means being able to find food by yourself within a certain range.
(3) Eagles need to forage within dozens of square kilometers to get enough food.
Foraging: Looking for food in a large area.
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