Seed Dispersal Keywords Class 7 – A Complete Guide for Students
Understanding how plants spread their offspring is a fundamental part of the Class 7 science curriculum. The term seed dispersal appears in many textbooks, worksheets, and exam papers. This article brings together the most important seed dispersal keywords for Class 7, explains the mechanisms involved, and highlights the role of animals, wind, and water in moving seeds away from the parent plant.
Why Seed Dispersal Matters
Seeds are the next generation of plants, and their survival depends on reaching a suitable place to germinate. By moving away from the parent plant, seeds avoid competition for light, water, and nutrients. In addition, dispersal reduces the risk of disease spread and increases the chances of colonising new habitats.
Key Vocabulary for Class 7
- Seed – The fertilised ovule containing the embryo, stored food, and protective coat.
- Dispersal – The movement of seeds from the parent plant to a new location.
- Vector – Any agent (animal, wind, water, or human) that carries seeds.
- Fruit – The mature ovary that protects seeds and often aids in their dispersal.
- Adaptation – A structural or behavioural feature that enhances seed dispersal efficiency.
Types of Seed Dispersal
Class 7 science distinguishes four main types of seed dispersal. Each type is linked to a specific set of keywords that help students remember the process.
1. Wind Dispersal (Anemochory)Seeds that travel by wind are usually light, small, and equipped with structures such as wings, hairs, or parachutes. Examples include dandelion seeds with silky pappus and maple samaras that spin like tiny helicopters.
- Lightweight – Reduces the force needed for lift.
- Winged – Increases surface area for better air resistance.
- Hairy – Allows seeds to float on air currents.
Plants growing near rivers, lakes, or oceans often produce buoyant seeds. These seeds have air‑filled cavities or a waxy coating that prevents water from entering.
- Buoyant – Enables seeds to stay afloat.
- Water‑proof – Protects the embryo from soaking.
- Floating – Allows seeds to travel long distances downstream.
Animals are powerful vectors because they can move seeds across varied terrains. Two
