Plant defense against herbivory which differ from one another in both functional groups, and in basic carbon skeletons. Monoterpenoids, continuing 2 isoprene units, are volatile essential oils such as citronella, limonene, menthol, camphor, and pinene. Diterpenoids, 4 isoprene units, are widely distributed in latex and resins, and can be quite toxic. Diterpenes are responsible for making "Rhododendron" leaves poisonous. Plant steroids and sterols are also produced from terpenoid precursors, including vitamin D, glycosides (such as digitalis) and saponins (which lyse red blood cells of herbivores). Phenolics, sometimes called "phenols", consist of an aromatic 6-carbon ring bonded to a hydroxy group. Some phenols have antiseptic
Plant-for-the-Planet President. In addition to the young people, one adult also serves on the board, in a position called the "Planet-for-the-Planet Secretariat". The goal of the Global Board is to give the organisation a focus and make organisation-wide decisions. Coordinated with the organisation, tree planting activities or "parties" are organised by students and children themselves. The students need to find foresters and environmental organisations to supply seedlings, and show them how, where, and when to plant. The funding needed to plant trees comes from individual and corporate donations. Plant-for-the-Planet promises to plant one tree for every Euro donated. The organisation also