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The reason why the respiration of plants is not obvious under light is () A. Photosynthesis is strong, absorbing carbon dioxide B. respiration is not carried out under light C. photosynthesis inhibits respiration D. respiration is weakened under light
A. The respiration of plants under light is not obvious, because not only respiration but also photosynthesis is carried out under light. The carbon dioxide produced by the decomposition of organic matter by respiration is absorbed by chloroplasts as raw materials for photosynthesis. B. the respiration of plants under light is the same, which is the wrong term. C. The raw materials for photosynthesis and respiration are different, so they are different But the temperature will affect the intensity of photosynthesis or respiration. D. under the light, the respiration of plants is not weakened, but because of the enhancement of photosynthesis, the carbon dioxide produced by respiration is consumed by the photosynthesis of plants, which is wrong
Design an experiment to prove that there is water in the atmosphere
1 make a completely enclosed glass box
Put the closed glass box in the refrigerator to cool down
3. Observe when the temperature drops to a certain extent
Phenomenon: water drops appear on the inner wall of the box
Phenomenon analysis: there is only air in the box, and the water droplets are formed by condensation of water vapor in the air
Conclusion: there is water vapor in the air
Design an experiment to prove that there is water vapor in the air
Add ice into the glass, the outer wall of the glass will appear condensed water, indicating that there is water vapor in the air
Or take something out of the refrigerator, such as an egg. After careful observation, the surface of the egg shell will soon be wet and there will be water droplets. This phenomenon can prove that there is water vapor in the air
Please design the experiment: 1 prove that the air contains carbon dioxide gas, 2 air contains water vapor
1. The clarified lime water exposed to air for a long time will become turbid gradually;
2. Biscuits stored in the air for a long time will become soft and no longer crisp
Organize with words~
RELATED INFORMATIONS
- 1. Please design a simple experiment to prove the existence of air in the mineral water bottle
- 2. [chemistry] design an experiment to prove that respiration produces carbon dioxide
- 3. In the article "carbon dioxide", green plants and carbon dioxide give out oxygen when they do (). Animals breathe in oxygen and exhale carbon dioxide. In this way, they keep ()
- 4. People and animals need to consume oxygen for breathing. Why can the volume fraction of oxygen in the air always maintain 21% 1. People and animals need to consume oxygen for breathing. Why can the volume fraction of oxygen in the air always maintain about 21%? 2. Can we draw a conclusion that nitrogen accounts for about 4 / 5 of the air from the burning experiment of red phosphorus in the bell jar? Why? 3. If there is water vapor in the air, will the content of water vapor change
- 5. When plants breathe at night, they should absorb oxygen and release carbon dioxide as usual, but will they also absorb a little carbon dioxide to breathe? When plants breathe at night, they should absorb oxygen and release carbon dioxide as usual But will it also absorb a little carbon dioxide to breathe?
- 6. Animals and plants can inhale oxygen and exhale carbon dioxide. What is the function of organisms Now!
- 7. Who is the source of oxygen in carbon dioxide produced by respiration Is it from oxygen
- 8. Students in a research study group used the following devices to explore the respiration of plants
- 9. In the experiment of studying the conditions of lever balance, we should balance the lever in the horizontal position first. What is the purpose of doing this?
- 10. What is the principle of light lever
- 11. Why do you drop a drop of water on the slide for onion mounting in the first volume of the seventh grade of human education (what's the purpose of dropping water) but why do you drop normal saline when you do oral epithelium mounting? Why can't you drop water?
- 12. Is it related to the respiration of plants that "grain should be dried in the sun before entering the warehouse"?
- 13. The significance of plant respiration
- 14. (2008. The first mock exam in Nankai District) the plant has respiration, except for energy release. A. Starch and oxygen B. water and organics C. water and carbon dioxide D. water and inorganic salts
- 15. When doing the research experiment of plant respiration, the gas produced can be introduced into () to verify the carbon dioxide produced in respiration
- 16. Respiration of green plants (conditions, raw materials, products, places)
- 17. According to the respiratory response of plants, write the respiratory response of human body Hurry up,
- 18. Please design an experiment to measure the burning speed of mosquito repellent incense, and write down the required experimental equipment, experimental steps and physical quantities to be measured
- 19. 1. In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:___________ In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:______________________ ,___________________ ,_____________ The expression of power is_________ . 2. As shown in the figure, it takes 100 seconds for Xiao Ming to ride a bicycle 600 meters in front of a uniform speed on a straight road, from which the speed of the bicycle can be calculated___ Assuming that the resistance of the bicycle is 60N, the power of Xiaoming's work during the journey is______ w. The physical formula used to solve the problem is as follows_________________________________________ Try to deduce the expression of the relationship between power and speed_________________________________________
- 20. Measurement of physical quantity With a steel tape measure and a piece of chalk, you are not allowed to go through any mathematical calculation, and you are not allowed to open the oil barrel. How can you directly measure the longest straight line distance in the cylindrical closed thin oil barrel?