A Complete Collection of 100000 Whys
Fav十万个为什么
地心既然有吸力，植物为什么还会向上生长？
地心虽然具有吸力，但植物仍会向上生长，主要基于以下几个原因：
1、向光性：植物茎部对光具有敏感性，会朝向光源生长。生长素在光照较弱的一侧浓度较低，促进细胞伸长，使茎向光弯曲。
2、重力感应与生长素分布：植物茎部对重力具有“背地性”，即背对地心方向生长。生长素在茎的下侧浓度较高，抑制下侧细胞生长，而上侧细胞因生长素浓度较低而伸长，导致茎向上生长。
3、细胞伸长机制：植物细胞通过吸水膨胀实现伸长，生长素促进细胞壁的弹性增加和细胞扩张，使茎部细胞持续伸长，推动植物向上生长。
总结：植物能够克服地心吸力向上生长，主要依赖于向光性、重力感应与生长素分布以及细胞伸长机制。这些机制共同作用，使植物茎部能够向光和背地生长，从而实现向上生长的目标。
1. Questo strumento raccoglie una vasta quantità di domande e risposte per rispondere ai vostri dubbi quotidiani.
2. Digitate direttamente le parole chiave della domanda che desiderate cercare nella casella di ricerca qui sopra.
3. I dati di questo strumento sono stati raccolti dal web; se riscontrate degli errori, potete segnalarceli affinché possano essere corretti.
Recommended Tools
![Audio format conversion tool]()
Audio format conversion tool
Convert audio formats in bulk online and download them locally.
![(BMR) basal metabolic rate]()
(BMR) basal metabolic rate
Online calculation tool for human basal metabolic rate (BMR)
![Longitude and latitude are converted to each other in minutes and seconds]()
Longitude and latitude are converted to each other in minutes and seconds
Online latitude and longitude decimal form and degree minute second form exchange conversion tool
![Square Calculation Tool]()
Square Calculation Tool
Online square calculation tool
![Blood pressure calculator]()
Blood pressure calculator
Calculate whether blood pressure is normal by measuring systolic and diastolic blood pressure
![Chrome内部页面查看工具]()
Chrome内部页面查看工具
Chrome内核浏览器内部页面查看工具
![Online Cookie to JSON Conversion]()
Online Cookie to JSON Conversion
Convert cookies to JSON format data online
![PX Batch to REM Tool in CSS]()
PX Batch to REM Tool in CSS
Batch convert PX units in CSS code to REM units
![Children's Sleep Calculator]()
Children's Sleep Calculator
Calculate the sleep time of children of different age groups
![Complete Excel Functions]()
Complete Excel Functions
Online search for commonly used Excel functions
![Provident Fund Loan Calculator]()
Provident Fund Loan Calculator
Provident fund loan calculator, with multiple calculation methods suitable for more scenarios.
![Online HEX and Character Conversion]()
Online HEX and Character Conversion
Online hexadecimal to text conversion tool
![HTML/BBB conversion tool]()
HTML/BBB conversion tool
Online HTML and UBB code conversion tool
![HTML code debugging preview]()
HTML code debugging preview
HTML code online debugging preview tool
![IP Backlookup Search Spider Tool]()
IP Backlookup Search Spider Tool
Check the IP address to determine if it is a search spider.
![Distribution Table of 56 Ethnic Groups in China]()
Distribution Table of 56 Ethnic Groups in China
Introduced the distribution provinces and introductions of 56 ethnic groups in China.
![PHP Function Reference Table]()
PHP Function Reference Table
PHP Online Function Reference List
![Hand speed test]()
Hand speed test
Online testing of mouse click speed
![Notification Deposit Calculator]()
Notification Deposit Calculator
Online Notification Deposit Savings Interest Calculator
![Online Text Insertion Tool]()
Online Text Insertion Tool
Batch insert specified characters into text online
![Rich Text Editor]()
Rich Text Editor
Online professional rich text editor
![Camera testing]()
Camera testing
Online mobile/computer camera testing tool
![Temperature unit conversion]()
Temperature unit conversion
Online conversion tool for temperature units
![Online salary conversion tool for single and double rest days]()
Online salary conversion tool for single and double rest days
Online single or monthly leave monthly salary conversion
粤ICP备2021116614号