"Baiji Dolphin" PPT courseware 3

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"Baiji Dolphin" PPT courseware 3

When the author introduces the ecological pyramid, he mainly uses examples to illustrate it.

1. Big fish eat small fish, small fish eat shrimps, shrimps eat plankton, and swimmers eat green algae... ( )

2. Locusts, inchworms, aphids, beetles and other insects, as well as voles, rabbits, antelopes, deer and other creatures all depend on it for survival ( )

3. Beetles eat grass, spiders eat beetles, chickadees eat spiders, and hawks prey on chickadees. ( )

4. For a beetle, one square meter of feeding space on the ground can meet its nutritional needs, while an eagle needs to forage within dozens of square kilometers to get enough food. Of these creatures there are fewer beetles than grasses, spiders smaller than beetles, chickadees fewer than spiders, hawks fewer than chickadees. ( )

5. Scientists examined the food chain of the biological world and found that it resembled a pyramid, so they called it an ecological pyramid. ( )

Think about it:

(1) What explanatory methods does the author mainly use to introduce the white-tip dolphin? From what aspects was it written?

(2) Use “~~” to draw relevant sentences.

Speaking practice:

Although the bald dolphin lives in the water, it is not a fish, but a mammal, a small whale.

Collaborative exploration, careful reading and insights:

Please start with "My name is the Baiji dolphin. About 60 million years ago, I lived in..." and introduce the evolution process of the Baiji dolphin.

Demonstration exercises:

1. The Baiji dolphin is indeed very big, nearly 3 meters long and weighing about 250 kilograms. ( )

2. The white-tip dolphin has a large lung capacity. Its head is above the water and it can sneak in the water for about half an hour by taking a full breath through its nostrils. ( )

3. In winter, the fat layer of baiji dolphins is five to six centimeters thick, accounting for more than one-third of its body weight. ( )

4. The brain of a fish is very small, but the brain of the white-tip dolphin is about 500 ml. There are many sulci on the brain, which are even more developed than many land animals. ( )

5. Newly born baby dolphins are nearly 1 meter long. The female dolphin has a pair of nipples, and the baby dolphins grow up by sucking milk. ( )

6. About 60 million years ago, the ancestors of whales, like the ancestors of other mammals, also lived on land. ( )

Expansion exercises:

1. Write a slogan to protect the white-tip dolphin

2. Introduce yourself to the baiji dolphin in the tone of the baiji dolphin’s self-narration.

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"Baiji Dolphin" PPT courseware 4:

"Baiji Dolphin" PPT Courseware 4 Learning Objectives: 1. Read the text correctly and fluently. 2. Understand the text content and learn explanation methods such as listing numbers and making comparisons. 3. Establish awareness of protecting animals. Compare your learning results with the learning objectives of this lesson, and you...

"Baiji Dolphin" PPT courseware 2:

"Baiji Dolphin" PPT Courseware 2 Recognize new words Dorsal fin Split Mammal Baiji Dolphin Palate Analysis Essence Gills Lungs Stealth Egg laying Changes Read the text silently and think: From what aspects does the text introduce the Baiji Dolphin? 1. Baiji dolphins are mammals, not fish. ..

"Baiji Dolphin" PPT courseware:

"Baiji Dolphin" PPT courseware learning objectives 1. Recognize and be able to write 10 new words: fin, split, feed, dolphin, analyze, quality, lung, dive, and egg move. 2. Read the text correctly and fluently. 3. Learn the method of comparative explanation. 4. Establish awareness of protecting the environment. Learn new words fin..

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Update Time: 2024-07-29

This template belongs to Chinese courseware Hunan Education Edition Fifth Grade Chinese Language Volume 1 industry PPT template

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