(4) Ways in which seeds are dispersed - adaptations to help propagate the next generation

In order for the plant species to continue the seeds must be scattered and spread (dispersed) by one means or another to avoid over competition from each other for the same nutrient resources.

(i) Animal dispersal

Animals can spread seeds in several different ways.

Fruits are a source of food to animals and after consumption the seeds are scattered in the dropped animal faeces some distance from the plant of origin.

The fruit, containing the seed, can stick to an animals coat and be carried away before falling off at some distant location. Some fruit have barbed points that make them stick on the animals coat.

 

(ii) Wind dispersal

Seeds are small lightweight objects are readily made airborne and carried away by the wind, to eventually settle some distance from the 'mother' plant.

Good examples are dandelions and sycamore seed bearing fruits.

 

(iii) Explosive dispersal

Some seed pods dry out and then the seeds inside are flung out in a mini explosion e.g. peas from a seed pod.

 

(iv) Drop and roll dispersal

If the fruit is round and smooth, after falling from the plant, it will roll away from the mother plant.

The conker fruits from the horse chestnut trees is a good example.

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Key points about the ways in which seeds and fruits are dispersed from flowering plants

Source of information is based on textbooks and syllabus-specifications for students taking the AQA GCSE, Edexcel GCSE and OCR GCSE level biology examinations (~US grades 9-10)

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Why Dispersal Is Important

Seed and fruit dispersal is essential because it:

• Reduces competition for light, nutrients, and water between parent and offspring.

• Spreads the species to new areas.

• Ensures survival of the species, especially when conditions change locally.

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Main Methods of Seed and Fruit Dispersal

Dispersal Method	How It Works	Adaptations	Examples
Wind	Light seeds/fruits are carried by air currents	- Light weight - Wings or parachutes (e.g. hairs or flattened structures)	Dandelion, Sycamore, Ash
Animal (External)	Seeds stick to fur or feathers	- Hooks, barbs, sticky coatings	Burdock, Goose grass
Animal (Internal)	Animals eat fruits and excrete seeds elsewhere	- Sweet, juicy, colourful fruits - Tough seed coats to survive digestion	Apple, Tomato, Cherry
Water	Seeds float on water and are carried away	- Waterproof outer coating - Air spaces for buoyancy	Coconut, Water lily
Self (Explosive/Ejection)	Fruit dries and bursts open, flinging seeds	- Tense tissues that split suddenly	Peas, Lupins, Balsam

Exam Tip: Recognise Plant Adaptations

Make sure you're able to match the physical features of seeds or fruits with their method of dispersal. Questions often include:

• Diagrams to label

• Tables to complete

• Descriptions to match to the dispersal method

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Summary

• Dispersal is about spreading seeds away from the parent.

• There are five major types: wind, animal (external and internal), water, self-dispersal.

• Each method involves specific adaptations of the fruit or seed to aid movement.

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Keywords, phrases and learning objectives for this part on flowering plants

Be able to describe and explain the ways in which seeds and fruits are dispersed.

Be able to describe adaptations including animal dispersal, wind dispersal, explosive dispersal and drop and roll dispersal of seeds or fruit.

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