Скачать или смотреть Gibberellin | Plant Growth & Development 7 | NCERT Mapped NEET Biology

Welcome to the NCERT Mapped series for NEET Biology! In this video, we dive deep into the chapter Plant Growth and Development (Class 11), breaking down complex concepts with visual diagrams and strict adherence to the NCERT curriculum.

📝 In this chapter, we cover:

✅ Lecture 1: Plant growth, Differentiation & Development
Covers:
—Growth vs differentiation vs development
—Why plants show “open” / indeterminate growth (meristems)
—Overview map: meristems → growth phases → hormones → environmental control (light/temp)
—Leads into: If growth is open, where exactly does it happen?

✅ Lecture 2: Location & Phases of Growth
Covers:
—Apical, intercalary, lateral meristems (location + function)
—Primary vs secondary growth
—SAM basics + leaf primordia + axillary bud idea
—Cellular phase: Mitotic division vs expansion vs differentiation (the triad)
—Phases for part/plant: Meristematic zone → elongation zone → maturation zone
Leads into: how to quantify growth—is there any pattern growth follows?

✅ Lecture 3: Growth Rates & Models of Growth
Covers:
—Parameters: increase in length/area/volume/dry mass/cell number
—“Growth is irreversible increase”
—Arithmetic vs geometric growth (with graphs)
—Relative Growth Rate (RGR)
—Sigmoid curve: lag/log/steady phases and what’s happening biologically
Leads into: Patterns are clear, but what decides the rate? Conditions!

✅ Lecture 4: Conditions of Growth & Plasticity
Covers:
—Water, oxygen, temperature, nutrients (and why each matters mechanistically)
—Rate-limiting reasoning (good for HOTS)
—Link: “conditions enable growth, but don’t direct it.
—Developmental Plasticity
—Environmental Plasticity
Leads into: So what “directs” growth form and timing? Hormones/PGRs

✅ Lecture 5: Auxin
Covers:
—Phototropism mechanism (auxin redistribution)
—Apical dominance, lateral root initiation
—Herbicides (2,4-D), parthenocarpy (conceptual)
Leads into: Auxin shapes; who drives “elongation and bolting”? GA.

✅ Lecture 6: Gibberellins — Stem Elongation, Bolting, Seed Germination
Covers:
—Internode elongation; dwarfism logic
—Alpha-amylase induction in germination (big conceptual anchor)
—Breaking dormancy (NCERT + logic)
—Leads into: If GA pushes growth, who pushes division/branching? Cytokinin.

✅ Lecture 7: Cytokinins — Cell Division, Shoot Formation, Delay of Senescence
Covers:
—Cell division + nutrient mobilization
—Tissue culture story: auxin:cytokinin ratio (shoot vs root)
—Anti-senescence as “development control”
Leads into: Now the gases—fast responses, ripening, abscission: Ethylene.

✅ Lecture 8: Ethylene — Triple Response, Ripening, Abscission & Senescence
Covers:
—Triple response logic (classic)
—Fruit ripening, abscission, senescence
—Ethylene as “stress + developmental switch”
Leads into: Growth also needs braking + stress survival: ABA.

✅ Lecture 9: ABA — Dormancy, Stress Physiology, Stomatal Closure
Covers:
—Dormancy (seed/bud), stress hormone framing
—Stomatal closure mechanism-level overview
—ABA vs GA as a push–pull system
Leads into: Hormones never act alone—how do they integrate with environment?

✅ Lecture 10: Photoperiodism & Vernalisation
Covers:
—SDPs, LDPs, day-neutral + critical day length
—Where perception occurs (leaves) and what moves (florigen concept)
—Action at shoot apex (flowering)
—Vernalisation concept + why it prevents premature flowering

💡 Why watch this series? This content is designed specifically for NEET aspirants who want to move beyond rote memorization. We focus on:

Visual Learning: Custom illustrations to visualize hidden processes.

NCERT Decoding: Every concept is mapped directly to your textbook.

Conceptual Clarity: Understanding the "Why" and "How" of Plant Physiology.

📚 About the "NCERT Mapped" Book: This video series complements my upcoming book, designed to provide a visual and conceptual roadmap for biology. Order from Amazon: https://amzn.eu/d/bcuC7GF
Visit my website: https://shantasonasingh.com

📢 Connect with me:

Website: shantasonasingh.com
YouTube:    / @shantasonasingh  
Telegram: t.me/sonasinghbiology
Arataai channel: https://aratt.ai/@shantasonasingh

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