| Category | Format | Size |
|---|---|---|
| People's Education Edition Biology for Grade 8, Volume 2 | pptx | 6 MB |
"Reproduction and Development of Amphibians" Reproduction and Development of Biological Organisms PPT Courseware 6
Description
"Reproduction and Development of Amphibians" Reproduction and Development of Biological Organisms PPT Courseware 6
Amphibians contain two meanings:
First, from the perspective of the evolutionary history of vertebrates, amphibians are a group that transitioned from aquatic to terrestrial.
Second, from the perspective of the ontogeny of amphibians, their larvae live in water and use gills to breathe; adults are amphibious, move with limbs, mainly use lungs to breathe, and also use skin to assist breathing.
Frog reproduction and development
At ten o'clock in the night, why do you know that there are frogs everywhere beside the grassy pond?
How do frogs chirp? Why tweet?
What about frog reproduction and development?
Think and answer:
1. What is the significance of the calls of male frogs and the hugs of male and female frogs?
The chirping of male frogs and the hugging of male and female frogs are frog reproductive behaviors, which can increase the rate of in vitro fertilization.
2. How is the reproductive development process of frogs different from that of silkworms?
frog silkworm
sexual reproduction metamorphosis
difference
1. In vitro fertilization
2. Go through four stages: egg, tadpole, young frog, and adult frog.
1. Internal fertilization
2. Go through four stages: egg, larvae, pupa and adult.
practise
1. The meaning of the frog’s skin being exposed and moist is ( )
A Protect body water from loss
B Facilitates gas exchange between the body surface and the outside world
C Reduce resistance during swimming
D Adapt to life in the water and be flexible in movement
2. The reproductive mode of amphibians is ( )
A Hermaphroditic, cross-fertilization, fertilization must occur on land
B Hermaphroditic, cross-fertilization, fertilization must be completed in water
C Dioecious, in vitro fertilization, fertilization must be carried out on land
D Dioecious, in vitro fertilization, fertilization must be completed in water
3. The main reason why frogs cannot live completely in water and cannot live completely on land is ( )
A Frogs have no covering on their body and lose water quickly.
B Frog’s breathing relies on two organs: lungs and skin
C There is not enough food in the water or on land
D The body dissipates heat poorly and cannot stay in water for a long time.
4． Classmate Liang caught a live frog and put it in a fish tank with more water. He prepared to raise it carefully and observe the activities of the frog. However, the frog died the next day because ( )
A. Unable to breathe b. hunger
C. frightened D. There is a problem with water quality
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For more information about the PPT courseware "Reproduction and Development of Biological Reproduction and Development of Amphibians", please click the Reproduction and Development of Biological Things ppt Reproduction and Development of Amphibians ppt tag.
"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 5:
"Reproduction and Development of Amphibians" Reproduction and Development of Organisms PPT Courseware 5 Amphibians Larvae live in water and breathe with gills; adults live amphibious life, breathing with lungs and using skin to assist breathing. Such animals are called amphibians. Thinking about frog life..
"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 4:
"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 4 Questions before class 1. What stages does the development process of silkworm go through? 2. What are the similarities and differences in the external morphology of silkworm larvae and adults? 3. What stages does a locust go through in its development process? 4..
"Reproduction and Development of Amphibians" Biological Reproduction and Development PPT Courseware 3:
"Reproduction and Development of Amphibians" Reproduction and Development of Organisms PPT Courseware 3 What kind of animals are called amphibians? Frogs, toads, giant salamanders and newts, etc. The larvae live in the water and breathe with gills; the adults mostly live on land. Go up, breathe with your lungs, and use your skin at the same time...
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Update Time: 2024-07-07
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