Answer:

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Explanation:

Organic fertilizer refers to materials used as fertilizer that occur regularly in nature, usually as a by product or end product of a naturally occurring process. Organic fertilizers such as manure have been used in agriculture for thousands of years; ancient farmers did not understand the chemistry involved, but they did recognize the benefit of providing their crops with organic material. Interest in organic farming is growing worldwide as sustainable agricultural practice nowadays. Organic fertilizers are sustained sources of nutrients due to slow release.

Explanation:

Dispersal of Seeds

Dispersal by Wind: Some fruits have very light and hairy or wing-shaped seeds that get caught in the wind and are easily blown away to far-off places. These seeds germinate in fertile soll if they get favourable conditions. Some of the plants whose seeds are dispersed by wind are dandelion, cotton and maple.

Dispersal by Water: Seeds of some fruits have a waterproof covering, and they are so light that they can float on water and can be carried to far-off places. For example, the coconut has a heavy seed inside, but it floats on water, as the seed is covered by spongy layers of fibre filled with air. The seed dispersal of lotus, water lily and mangrove takes places with the help of water.

Dispersal by Animals: Some seeds have hook-like structures that help them cling on to animals' fur or have sticky substances that stick to animals' skin. This way, the seeds are carried away from the parent plant. Many birds and animals eat fruits along with their seeds. The seeds come out of their bodies in their droppings and are scattered to different places where they grow into new plants. Examples of plants whose seeds are dispersed by animals are cocklebur, mistletoe and berries.

Dispersal by Explosion: Some seeds have a leathery covering, or are found inside pods that explode or split open when exposed to the sun, or when they dry up, or even when they are touched. When the pods burst open, the seeds are scattered far away from the parent plant. Examples of plants whose seeds are dispersed by explosion include pea, gorse, peanut, balsam and castor,