Letter - P
- Parasite - An organism that uses a host for shelter, food or distribution but provides nothing in return.
- Parasitism - A term to describe the relationship between two organisms in which one is a parasite. (See above.)
- Peat - A soil made up of partially decomposed organic material. A common ingredient in compost.
- Perennial - A plant which lives for two or more years.
- Phloem - Plant tissue form like a tube that a plant uses to transport nutrients throughout its structures.
- Photosynthesis - The process in which a plant makes food using sunlight to convert water, nutrients and carbon dioxide into oxygen, sugar and starches.
- Phototropism - The name of the process in which a plant bends towards a light source. A growth hormone called auxin contained in stem tissue is responsible for the action.
- Plant - A living organism that experiences photosynthesis to provide food.
- Primary Root - The first root that begins to develop in a germinating seed.
- Primary Growth - Plant growth occurring a the tips of the stem (terminal buds) or at the tips of the roots.
Letter - Q
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Letter - R
- Root - Tissue of a plant which gathers nutrients and moisture. It also stores energy for the plant to uses at a later time.Roots, when growing in soil, provide support for the plant.
- Root Cap - The tips of roots.
- Root Hairs - Fine hair like roots that are a extension of the root itself. They help to increase the overall surface area to aid moisture absorption.