"Ecological Pyramid" PPT

"Ecological Pyramid" PPT

Part One: First Reading Perception

word integration

antelope

Meaning of the word: ①antelope; ②refers to antelope horns.

Group word: antelope (antelope) (takin)

Word identification: listen (listen) (listen) (listen to teach)

Sentence: On the hillside, a group of antelopes were grazing leisurely.

Tom

Literal meaning: nanny.

Group words: Mu (nanny)/mu (mū) mother

Character identification: mother (mother) (parents) (maternal love) (aunt)

Sentence: Black pottery is a major feature of Hemudu pottery.

Error-prone tips for reading and writing

Correct pronunciation:

Breastfeeding (bǔ√pǔ) hectare (qpng√ｑqpn)

Punishment（ｃｈｎ�√chěng）

Distinguish the shape:

Do not write "Jin" on the right side of "Ling";

Don't write "Liang" above "Ken".

Word Definition - Learn it

Dependence: refers to the fact that various things or phenomena are mutually conditioned and inseparable.

Bearing: To hold an object and bear its weight.

Loss: Loss consumption.

Reclamation: converting wasteland into land that can be cultivated.

Hectare: A unit of land area, one hectare equals 10,000 square meters.

Ecological Pyramid PPT, Part 2: Overall Perception

Read the text and try to fill it in

"Ecological Pyramid" is an explanatory article ( ), which introduces ( ) and ( ) of the ecological pyramid in detail, telling people that ( ) is limited, and if we do not follow this ( ), humans will surely suffer from ( ).

special statement

The text is an expository text. The author uses a variety of explanatory techniques to find representative sentences, read them emotionally, and understand their functions.

For a beetle, 1 square meter of underground feeding space can meet its energy and nutritional needs, while an eagle needs to forage within dozens of square kilometers to get enough food. --compared to

There are fewer beetles than grasses, fewer spiders than beetles, fewer chickadees than spiders, and fewer hawks than chickadees. --for example

Scientists examined the food chain of the biological world and found that it resembled a pyramid with a large base and a large top, so they called it an ecological pyramid. --for example

Every time the ecological pyramid passes through a trophic level, about 90% of the energy is lost. The higher you go up, the thinner the energy flow, the less energy flowing into the top of the tower, and the less energy available to humans. ——Column numbers

Paragraph to the effect

Briefly describe the main content of each section:

Part One (1-2) Living things are interdependent.

Part 2 (3-4) The composition of the ecological pyramid.

Part Three (5-6) The relationship between ecology and human beings.

Part 4 (7) Must follow the laws of nature.

Ecological Pyramid PPT, Part 3: Read the text again

1. From paragraph ①, what rules can be seen in the biological food chain?

In the biological food chain, the level of organisms is inversely proportional to their quantity and energy. That is, the higher the level, the smaller the quantity and the less energy; conversely, the lower the level, the greater the quantity and the more energy.

2. From paragraph ②, we can know that the organisms in the biological chain can be divided into three levels?

The first level is countless weeds; the second level is plant-eating animals, such as insects and mammals such as rabbits and antelopes; and the third level is carnivorous animals, such as weasels, tigers, lions, etc.

3. Paragraph 2 gives the examples of “beetle”, “eagle” and “tiger”. What does it illustrate?

Take "beetle", "eagle", "tiger", etc. as examples, and use the explanation method of listing numbers and making comparisons to tell everyone that the living range and space of high-level creatures are much larger than that of low-level creatures, so there are much fewer high-level creatures than low-level creatures. .

4. Understand the structure of the ecological pyramid and try to analyze the close relationship between green plants and human survival.

In each trophic level sequence of the ecological pyramid, the existence of the previous trophic level always depends on the energy of the next trophic level. The higher the trophic level, the more energy it consumes. The energy basis of all living things comes from green plants, so the number of green plants determines the carrying capacity of our earth.

Ecological Pyramid PPT, Part 4: Intensive Reading of the Text

Draw an ecological pyramid yourself and write the content of each level.

Carnivores: wolf, fox, tiger, lion,

Herbivores: insects, zooplankton, cattle, horses

Green plants: weeds, seaweed, vegetables

Let me tell you, through studying the ecological pyramid, what laws of the food chain have we understood? What do you understand?

Rule 1. From paragraph 4: The bottom layer of the ecological pyramid is green plants. Green plants are the energy basis of all living things, are primary producers, and are at the first trophic level in the food chain. Above the green plants, there are herbivores, which is the second trophic level. Carnivores are at the third trophic level.

Rule 2. Derived from paragraph 4: The relationship between trophic levels in the ecological pyramid: the lower level is the producer, the upper level is the consumer, and the energy of the lower trophic level cannot satisfy all consumption in the previous trophic level. The needs of consumers can only serve a few consumers, so the trophic level sequence of the pyramid is strict.

Rule 3. From paragraph 5: The green plants at the base of the pyramid are the source of energy and nutrients for all living things on the earth.

Rule 4. From paragraph 5: The number of green plants depends on the earth’s carrying capacity.

Rule 5. From paragraph 5: Every time the ecological pyramid passes through a trophic level, about 90% of the energy is lost. The higher you go up, the thinner the energy flow, the less energy flowing into the top of the tower, and the less energy available to humans.

Rule 6. It can be concluded from paragraph 7: The load capacity of nature is limited, and it can never exceed the load capacity to support the consumers at the top of the pyramid.

Reason: Human activities must follow the laws of the ecological pyramid.

Ecological Pyramid PPT, Part 5: Practice in class

1. Use “√” to draw the correct pronunciation of the braille characters below.

Green algae (zǎozhǎo) Antelope (línlíng) Basics (cǔ chǔ)

Reclamation (kěnkěｎg) hectare (qpnqpng) punishment (chénchéng)

2. First write the words with the following radicals, and then form words separately.

worm door

3. What explanation methods are used in the following sentences?

1. A child weighs 48 kilograms, a calf weighs 1035 kilograms, and an alfalfa weighs 8211 kilograms. The weight of a calf is 22 times that of a child, and the weight of alfalfa is 171 times that of a child! ( )

2. For a beetle, 1 square meter of underground feeding space can meet its energy and nutritional needs, while an eagle needs to forage within dozens of square kilometers to get enough food. ( )

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