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TOP 25 QUESTIONS FOR NEET 2021| photosynthesis | BY #RAHULSIR This channel will help u to know the strategies, plans, motivational stuff, educational videos for all national level exams like NEET, AIIMS, JIPMER, KVPY, O...

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TOP 25 QUESTIONS FOR NEET | TRANSPORT IN PLANT | BY #RAHULSIR This channel will help u to know the strategies, plans, motivational stuff, educational videos for all national level exams like NEET, AIIMS, JIPMER, KVPY, O...

Anatomy of Flowering Plants
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🌸🌸Plant growth and development🌸🌸

😍NCERT😍....

😎Revision pointzzzzz...😎

🔭🔭 A single maize root apical meristem can be give rise to more than 17500 new cells per hour

💊💊 A wateremelon cell can increase its size upto 3,50,000 times

📪📪 Arithmetic growth rate - Only one daughter cell continuous to divide while others differentiate and matures

📣📣 Geometric growth rate - all the daughter cells produced will divide..Sigmoid growth curve is obtained

📌📌 Absolute growth rate - Increase in growth per unit time

📍📍 Relative growth rate - Increase in growth per unit time per unit initial parameter

🎡🎡 Relative growth rate also called as Efficiency index

🎢🎢 Differentiation - Conversion of meristamatic cell into structurally and functionally specialised Primary permanent tissue...eg: Formation of primary xylem

🎠🎠 Dedifferentiation - Conversion of primary permanent tissue to Secondary meristems....eg: Formation of cork cambium

🎪🎪 Redifferentiation - Formation of secondary permanent tissus from secondary meristems....eg: Formation of secondary xylem

🎥🎥 Development in plants = Growth + differentiation

🎭🎭 Eg of plasticity - Heterophylly in cotton, coriander, larkspur in which leaves of juvenile and mature stages are different......Heterophylly in buttercup in which leaves in terrestrial and aquatic habitat plants are different

🐚🐚 Plants growth regulators can be any group of small chemical molecule They can be indole compounds eg: Indole 3 acetic acid (IAA).....Adenine derivatives eg: N6 furfuryl amino purine, kinetin.....carotenoids eg: abscisic acid....terpenes eg: gibberellic acid....Gases eg: ethylene

🐝🐝 Plant growth promotors - Auxin, Cytokinin, Giberellic acid

🐞🐞 Plant growth inhibitors - Abscisic acid

🐲🐲 Ethylene has both properties

💝💝 Auxin - Effects :

🎓1. First isolated from human urine
🎓2. IAA & IBA are natural auxins and NAA & 2,4 - D are synthetic auxins
🎓3. Auxin initiate roots in stem cuttings
🎓4. It promotes flowering in pineapples
🎓5. Prevent abscission of young fruit and leaf...promotes abscission of old leaf & fruits
🎓6. Promote apical dominance 7. 2,4-D act as herbicide in dicots

💝💝 Gibberellins - Effects

🌈🌈1. Increase length of grape stalks
🌈🌈2. Causes fruits like apple to elongate and improve its shape
🌈🌈3. Delay senescence
🌈🌈4. GA3 promote malting in brewing industry
🌈🌈5. Increase length of stem in sugarcane and increase yield upto 20 tonnes per acre
🌈🌈6. Cause internodal elongation in beet, cabbage, and other rosette plants

💝💝 Cytokinins - Effects

⛳⛳1. Promote cell division
⛳⛳2. Overcome apical dominance
⛳⛳3. Promote nutrient mobilisation

💝💝 Ethylene - Effects

🚀🚀1. Promotes senescence and abscission
🚀🚀2. Promote ripening
🚀🚀3. Breaks seed and bud dormancy
🚀🚀4. Helps leaf & upper part of shoot to remain above water
🚀🚀5. Initiate flowering in pineapple

💝💝 Abscissic acid - Effects

🚔🚔1. Inhibits seed germination
🚓🚓2. Also called stress hormone
🐍🐍3. Antagonist to GA

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🌳🐍 BIODIVERSITY🌲🍀....
🌺NCERT🌺....
Revision pointzzzz🌈🌈....
🐟🐟 There are about 20,000 species of ants, 3,00,000 species of beetles, 28,000 species of fishes & 20,000 species of orchids

🐛🐛 Term biodiversity was popularised by Edward wilson

🐝🐝 India has 50,000 genetically different strains of rice and 1000 varieties of mango

🐞🐞 Acc to IUCN (2004), No.of species discovered and described range about 1.5 million

🐲🐲 Robert may estimate - total no.of species is around 7 million

🐉🐉 More than 70% of species discovered are animals

🐜🐜 More than 70% of animals are insects

🐌🐌 Plants constitute not more than 22% of total species

🐬🐬 Total no.of species of fungi is more than combined total of fishes, amphibians, reptiles and mammals

🐥🐥 India occupy 2.4% of total land surface but they contribute 8.1% of total biodiversity

🐦🐦 There are about 45,000 species of plants and twice as many animals are discovered in india

🐢🐢 Acc to robert estimate...only 22% of total no.of species have been discovered

🐏🐏 There are 1,00,000 plant species and more than 3,00,000 animals species are yet to be discovered in india

🐀🐀 Columbia has 1400 species of birds...newyork - 105 species of birds, Greenland - 56 species

🐦🐦 India has 1200 species of birds Amazonian rain forest in south

🌲🌲america has 1300 species of birds, 40000 species of plants, 427 amphibians, 427 mammals, 378 reptiles, more thab 1,25,000 invertebrates

🌱🌱 The colonisation of tropical pacific island by humans has led to the extinction of 2000 species of native birds

🌴🌴 Over 784 species have extincted in past 500 years ( 359 invertebrates, 338 vertebrates & 87 plants )

🌵🌵 In last 20 years, 27 species disappeared

🌴🌴 Around 15,500 species are facing threat of extinction

🌾🌾 32% amphibians, 31% gymnosperms, 23% mammals, & 12% birds are facing threat of extinction 🙏🙏

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