# Seed Dormancy and How to Break It > Seed dormancy for NEET Biology: causes such as hard coats and ABA inhibitors, scarification, stratification, chilling, after-ripening and vivipary in mangroves. - Canonical URL: https://prepelephant.com/topics/neet-ug/biology/seed-dormancy-break - Exam / course: NEET-UG · Subject: Biology - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Seed Dormancy and How to Break It", PrepElephant, https://prepelephant.com/topics/neet-ug/biology/seed-dormancy-break ## Direct answer A viable seed that refuses to germinate even when supplied with water, oxygen and a suitable temperature is dormant, not dead — an adaptive pause that carries the embryo through unfavourable seasons. Dormancy has three broad causes: a hard, impermeable seed coat that blocks water and gases (many legumes); a physiologically immature embryo that needs an after-ripening period; and chemical inhibitors, chiefly abscisic acid, that must be leached away or degraded. Breaking dormancy therefore matches the cause: scarification (nicking, filing or acid-treating the coat), stratification or chilling at low temperature for temperate seeds such as peach and apple, leaching of inhibitors by rain or soaking, and exposure to light or fluctuating temperature where those are the cues. Mangroves like Rhizophora show the opposite extreme, vivipary, in which the seed germinates while still attached to the parent fruit. ## What you must remember - **Dormancy versus quiescence:** a dormant seed fails to germinate even under favourable moisture, oxygen and warmth; a quiescent seed fails only because conditions are unfavourable — a distinction NEET statements love. - **Coat-imposed dormancy:** hard, waxy or impermeable testas in legumes and cotton prevent water uptake and gas exchange; broken by scarification — mechanical nicking, hot water or dilute acid. - **Physiological dormancy:** an immature embryo must complete after-ripening; temperate fruits such as peach, cherry and apple need weeks of cold stratification (roughly 4 degrees Celsius in horticultural practice) before germination. - **Chemical dormancy:** inhibitors, especially abscisic acid, keep the seed asleep; rain, prolonged soaking or natural decay leaches them out, while gibberellin actively promotes germination by inducing enzymes such as alpha-amylase in cereal grains. - **Adaptive value:** dormancy tides the embryo over drought, winter and heat, spreads germination across time, and in desert plants synchronises sprouting only after substantial rain. - **Vivipary:** in Rhizophora and other mangroves, seeds germinate inside the fruit still on the parent tree, so the seedling drops like a dart into the mud — dormancy entirely bypassed. - **Viability:** most agricultural seeds stay viable for one to a few seasons; reports of ancient sacred lotus seeds germinating after centuries of storage are famous but should be quoted as reported findings, not routine values. ## From a peach orchard to the exam bench Work through why an orchardist chills peach pits. The pit carries a dormant embryo inside a stone-hard coat and, in temperate species, an internal physiology that demands a prolonged cold spell before growth is permitted. Horticulturists imitate winter: warm moist storage first lets the coat soften, then weeks of chilling at refrigerator temperature complete stratification, and spring warmth triggers germination. Skip the chill and the pit sits inert for a year — the embryo is ready long before the gardener's patience. Legume dormancy is the mirror image. The problem is not embryo physiology but a coat so hard that water never reaches the inside. Dip the seeds in hot water or rub them with sandpaper — scarification — and germination follows within days. Indian farmers sowing hard-coated pulses have long used a version of this, soaking seed overnight before sowing. The hormonal layer sits beneath both stories: abscisic acid maintains dormancy, gibberellin breaks it, which is why gibberellin treatment can substitute for part of the chilling requirement in several species, per standard accounts. Match the breaking method to the cause — coat, embryo or inhibitor — and any exam scenario answers itself. ## Where students slip The classic slip is treating every non-germinating seed as dormant; if the seed simply lacks water, it is quiescent, and adding water is the whole story. The second slip is hormonal: abscisic acid is the dormancy-maintaining hormone, gibberellin the germination-promoting one, and reversing them in an assertion–reason item costs an easy mark. Finally, vivipary is often mislabelled as a form of dormancy; it is the complete absence of it, shown by mangroves, and NCERT cites Rhizophora by name. ## Frequently asked questions ### Which treatment breaks coat-imposed dormancy in legumes? Scarification — mechanical nicking, hot-water treatment or dilute acid — renders the hard testa permeable to water and oxygen. ### Which hormones maintain and break seed dormancy respectively? Abscisic acid maintains dormancy; gibberellin promotes germination, notably by inducing alpha-amylase in cereal grains. ### What is stratification? Exposure of seeds to a period of moist chilling, imitating winter, which satisfies the cold requirement of temperate species such as peach and apple. ### How does dormancy differ from quiescence? A dormant seed will not germinate even under favourable conditions; a quiescent seed germinates as soon as water, oxygen and warmth become available. ### What is vivipary, and in which plants is it seen? Germination of the seed while still attached to the parent fruit, seen in mangroves such as Rhizophora.