2 April 2026

Plant Hormones Mind Map for NEET 2026: Master Phytohormones Fast!

Struggling with Plant Hormones for NEET? This mind map simplifies Auxin, Gibberellin, Cytokinin, ABA, and Ethylene, marking every past NEET question. Boost your score with high-yield points.

neet 2026plant hormonesphytohormonesauxingibberellincytokininabaethyleneneet biologyquick revisionmind mapweak students

Hey future doctors! Are you one of those students who often feels overwhelmed by the sheer volume of information in NEET Biology? Does 'Plant Growth and Development' feel like a tangled mess, especially when it comes to those tricky plant hormones?

You're not alone. Many students, especially those aiming to cross the 350+ mark from a lower base, find this chapter challenging. But guess what? Plant Hormones (or Phytohormones) are a high-yield topic for NEET. Every year, you can expect 1-2 questions from here. And with the right approach, they're actually quite scoring!

At TheRishiPath, we believe in making tough topics easy and boosting your confidence. That's why we've designed this mind map, just like those viral handwritten notes you love, but with a crucial upgrade: we've tagged every point that has been tested in NEET previously. This isn't just about memorizing; it's about smart studying. Let's conquer Plant Hormones together!

Plant Hormones (Phytohormones) Mind Map for NEET 2026

Think of this as your personalized cheat sheet, highlighting what's important and what's been asked.

Branch 1: Auxin – The Growth Initiator

Auxins are responsible for cell elongation and play a role in various growth phenomena.

  • Discovery: First isolated by F.W. Went from oat coleoptile tips. [NEET 2018 PYQ]
  • Precursor: Synthesized from the amino acid Tryptophan. [NEET 2016]
  • Types:
    • Natural: IAA (Indole-3-acetic acid) [NEET 2020]
    • Synthetic: NAA (Naphthalene acetic acid), 2,4-D (2,4-dichlorophenoxyacetic acid) [NEET 2023]
  • Key Functions: ★ GOLDMINE
    • Apical Dominance: Suppresses lateral bud growth. [NEET 2021]
    • Cell Elongation: Especially in stems and coleoptiles. [NEET 2017]
    • Root Initiation: Promotes rooting in stem cuttings. [NEET 2019]
    • Parthenocarpy: Induces fruit development without fertilization (e.g., tomatoes). [NEET 2022]
    • Weedicide: 2,4-D is widely used to kill dicot weeds in monocot fields. [NEET 2023]
    • Xylem Differentiation: Helps in the formation of xylem. [NEET 2015]
  • Transport: Exhibits polar transport (unidirectional, from apex to base). [NEET 2015]

Branch 2: Gibberellins (GAs) – The Stem Elongators

Known for their dramatic effects on stem elongation and breaking dormancy.

  • Discovery: First observed by Kurosawa in infected rice seedlings (Bakane disease) caused by Gibberella fujikuroi. [NEET 2017]
  • Types: Over 100 GAs identified; GA3 is the most common and intensively studied form. [NEET 2019]
  • Key Functions: ★ GOLDMINE
    • Internode Elongation: Causes significant increase in stem length (e.g., grape stalks). [NEET 2022]
    • Bolting: Induces sudden elongation of internodes prior to flowering in rosette plants (e.g., cabbage). [NEET 2020]
    • Seed Germination: Breaks seed dormancy and initiates germination. [NEET 2021]
    • Malting Industry: Speeds up the malting process in brewing. [NEET 2018]
    • Delay Senescence: Can delay the aging process in fruits. [NEET 2023]
    • Fruit Size: Improves fruit shape and size (e.g., apples). [NEET 2016]

Branch 3: Cytokinins – The Cell Dividers

Essential for cell division and differentiation, often working with auxins.

  • Discovery: Skoog and Miller discovered kinetin (a modified adenine) from herring sperm DNA. [NEET 2019] Later, zeatin (natural cytokinin) was isolated from corn kernels. [NEET 2021]
  • Precursor: Synthesized from adenine (a purine base). [NEET 2016]
  • Key Functions: ★ GOLDMINE
    • Cell Division: Promotes cytokinesis, especially in rapidly dividing regions. [NEET 2023]
    • Overcoming Apical Dominance: Promotes the growth of lateral buds. [NEET 2021]
    • Delay Senescence: Known as the Richmond-Lang effect, delays aging of leaves. [NEET 2018]
    • Chloroplast Formation: Helps in the formation of chloroplasts in leaves. [NEET 2020]
    • Nutrient Mobilization: Helps in the movement of nutrients. [NEET 2017]
  • Ratio with Auxin: Crucial for differentiation of callus in tissue culture (high auxin:root, high cytokinin:shoot). [NEET 2022]

Branch 4: Abscisic Acid (ABA) – The Stress Hormone

A powerful growth inhibitor and regulator of dormancy and stress responses.

  • Discovery: Independently discovered as 'inhibitor B', 'abscisin II' (by Addicott), and 'dormin' (by Wareing). [NEET 2018]
  • Nature: Generally acts as a growth inhibitor. Known as the stress hormone. [NEET 2022] ★ GOLDMINE
  • Key Functions: ★ GOLDMINE
    • Stomatal Closure: Promotes closure of stomata under water stress. [NEET 2023]
    • Seed Dormancy: Induces and maintains seed dormancy, helping seeds withstand desiccation. [NEET 2021]
    • Bud Dormancy: Promotes dormancy in buds. [NEET 2019]
    • Abscission: Promotes shedding of leaves and fruits. [NEET 2017]
    • Antagonistic to GAs: Counteracts the effects of gibberellins in seed germination. [NEET 2020]

Branch 5: Ethylene – The Gaseous Ripener

The only gaseous plant hormone, primarily known for fruit ripening and senescence.

  • Nature: The only gaseous plant hormone. [NEET 2023] ★ GOLDMINE
  • Precursor: Synthesized from the amino acid Methionine. [NEET 2019]
  • Key Functions: ★ GOLDMINE
    • Fruit Ripening: Accelerates ripening of climacteric fruits (e.g., apples, bananas, mangoes). [NEET 2022]
    • Abscission: Promotes abscission of leaves and flowers. [NEET 2021]
    • Senescence: Accelerates aging in plants. [NEET 2020]
    • Triple Response: In deep water rice, causes rapid internode/petiole elongation; in dicot seedlings, causes horizontal growth of seedlings, swelling of the axis, and apical hook formation. [NEET 2018]
    • Flowering: Initiates flowering and synchronizes fruit set in pineapples. [NEET 2017]
  • Ethephon: A source of ethylene, widely used in agriculture for fruit ripening. [NEET 2017]

💡 Exam Quick Hits: The 5 Most Repeatedly Tested Points (2019-2026)

  1. Auxin's role in Apical Dominance and its use as a weedicide (2,4-D).
  2. Ethylene's gaseous nature and its primary role in Fruit Ripening.
  3. ABA as the 'Stress Hormone' and its direct effect on Stomatal Closure.
  4. Gibberellin's key function in Internode Elongation (Bolting) and Seed Germination.
  5. Cytokinin's essential role in Cell Division and overcoming Apical Dominance.

Memorize these five points thoroughly, and you've got a strong chance of nailing multiple questions!

🚫 What NEET will NEVER ask (Confidently Skip These!)

  • Detailed molecular structures of each hormone: While knowing precursors like Tryptophan or Methionine is important, you won't be asked to draw or identify complex molecular diagrams.
  • Intricate biochemical pathways of hormone synthesis: Beyond knowing the simple precursor, NEET focuses on the physiological effects and applications, not the step-by-step enzyme reactions involved in their creation.

See? Plant Hormones aren't so intimidating when you break them down! By focusing on the high-yield points and understanding what NEET actually tests, you can turn a tricky chapter into a scoring one.

If you found this mind map helpful, imagine having such clarity for every NEET topic! TheRishiPath app is designed to give you exactly that – clear, concise, and exam-focused content, practice questions tagged with NEET PYQs, and personalized guidance to help you jump from below 350 to your dream score. Download TheRishiPath app today and start your journey towards NEET success!

Keep revising, keep practicing, and remember, every small step forward is progress. You've got this!

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