Dispersal is when a plant, animal, or other organism moves from where it was created to another site, usually for breeding or growing purposes. Large bodies of water: ADVERTISEMENTS: This is the most effective barrier to al­most all […] This is Lesson 3: Seed Dispersal, from Unit 3 (How Plants Work) in a series of units on plants, animals, and ecosystems. Seeds with attractive fruit or seeds To attract the animals and birds and encourage them to act as seed carriers, plants often surround their seeds with a brightly-coloured and sweet-tasting pulp. Biological Barrier. Physical Barrier: The land is a barrier to aquatic animals and water is barrier to most land animals. Animals as Dispersal Agents. The seed dispersal is very crucial to the survival of plants. The method they use depends on the type of seed. The dispersal of African snails to various parts of the world is the example of effective anthropo­genic dispersal of animals. Now we are talking about five different animals here that play a very important role in this dispersal. Researchers have unfolded many covers from the unusual suspects that play a very important and crucial role in dispersing the seeds of the native plant species. 2-LS2-2 addresses developing a simple model that mimics the function of an animal in dispersing seeds or pollinating plants. Plants that depend on animals for dispersal have seeds that are adapted to traveling on the outside or the inside of the animal. In creating animal, students are provided with an opportunity to show that they comprehend how animals disperse seeds to help with creating new plants. There are two types of dispersal: active and passive. ADVERTISEMENTS: The following points highlight the two major barriers to dispersal of animals. Seeds with burrs or hooks can attach to an animal’s fur. The barriers are: 1. Animals of all sorts and sizes help plants to disperse their seeds. Examples of seed dispersal by animals; Brightly coloured and juicy fruits are often eaten by animals like birds. E.g. Physical Barrier 2. 1. (1) Gradual Dispersal: Gradual dispersal is secular in nature be­cause it involves longer period of time and very slow rate of migration but such dispersal covers larger areas and results in wide-spread distribution of animals … Dispersal "strategies" for plants Resistant seeds, spores (floating on salt water) Tiny size for distant transport by wind hitchhikers (phoresy): hooks, hairs for transport by animals animal hitchhikers: flower mites in hummingbird noses The dispersal of animals is usually linked with a change in abiotic and biotic environmental conditions and in the population size of the animals. – blackberries, strawberries, raspberries and gooseberries The hard seeds inside these fruits pass out of the animal’s body in its droppings. 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