NEB Class 12 • Biology • Plant Physiology • Concept Guide

Plant Hormones: Auxin, Gibberellin & Cytokinin: NEB Class 12 Biology Guide

Master Plant Hormones: Auxin, Gibberellin and Cytokinin through clear concepts, representations, a reliable answer method and exam-focused practice.

Read the quick answerExplore FAQs
Student organizing English practice notes at a library desk

Concepts · Worked reasoning · NEB practice

Quick answer: Plant hormones are signalling molecules active at low concentration. Auxin, gibberellin and cytokinin influence elongation, division, differentiation, dormancy, germination and organ development through context-dependent interactions.

Core concept

What Plant Hormones: Auxin, Gibberellin and Cytokinin means physically

Plant hormones are signalling molecules active at low concentration. Auxin, gibberellin and cytokinin influence elongation, division, differentiation, dormancy, germination and organ development through context-dependent interactions.

Predict a response from hormone, tissue, dose, developmental stage and environment rather than assigning one universal effect.

The institutional reference gives the wider physical model; the CDC curriculum determines the NEB boundary.

Worked checkpoint with interpretation

Auxin supports apical dominance, cytokinin can promote lateral bud growth and cell division, and gibberellin can stimulate stem elongation and seed germination.

Do not stop at the number. State what the sign, ratio, spacing, frequency or direction means. A common error is Calling hormones nutrients, assuming each has one function, or ignoring concentration and tissue sensitivity.

NEB answer method

Model → evidence → equation → check

First identify the system and what the question asks. Label the diagram, apparatus or reaction with SI quantities, then state the principle before selecting an equation. Solve symbolically where possible and check units, limiting cases and chemical or physical meaning.

StageQuestionEvidence
ModelWhat is idealised?Assumption stated
RepresentationWhich diagram fits?Labels or balanced equation
CalculationWhich relation follows?Symbols then SI values
EvaluationDoes it make sense?Unit, sign and trend check

Make the idea concrete in Nepal

Connect the model to a school laboratory, household technology, health, environment, energy or local material. The example should clarify the science rather than merely mention a place. Compare a prediction with an observation and record uncertainty.

Review the NEB Class 12 Biology revision roadmap and the complete Biology guide. For online or physical tuition, call 9846662070.

Questions students ask about Plant Hormones: Auxin, Gibberellin and Cytokinin

What is the central idea of Plant Hormones: Auxin, Gibberellin and Cytokinin?

Plant hormones are signalling molecules active at low concentration. Auxin, gibberellin and cytokinin influence elongation, division, differentiation, dormancy, germination and organ development through context-dependent interactions.

Which equation should I remember?

Predict a response from hormone, tissue, dose, developmental stage and environment rather than assigning one universal effect.

How should I begin a numerical?

Draw the situation, list known quantities in SI units, choose the governing relation symbolically, substitute once and finish with a unit and reasonableness check.

What is a common exam mistake?

Calling hormones nutrients, assuming each has one function, or ignoring concentration and tissue sensitivity.

How can I practise this topic?

Alternate one concept explanation, one diagram and two numericals. Revisit errors after a day instead of only rereading the solution.

Where can I get tuition support?

For online or physical KTM Tuition classes, call 9846662070. After Grade 12, the MKS Education panel below gives preparation and pre-counselling contacts.

Frequently asked questions

References and next steps

Scope checked against CDC Nepal; concept support from an institutional reference and OpenStax Science. Continue with the Plant Hormones: Auxin, Gibberellin and Cytokinin cluster.

NEB +2 tuition support

Ask about online or physical tuition

For focused Class 11 and Class 12 subject tuition, lesson clarification, worked-example practice and exam preparation, call 9846662070. Class mode, timetable, teacher availability and fees should be confirmed directly before enrolment.

Call 9846662070