Girasol definition, an opal that reflects light in a bright luminous glow. See more.
Pheophytin or phaeophytin (abbreviated Pheo) is a chemical compound that serves as the first electron carrier intermediate in the electron transfer pathway of Photosystem II (PS II) in plants, and the photosynthetic reaction center (RC P870) found in purple bacteria.
Auxins are a class of plant growth substances and morphogens (often called phytohormone or plant hormone). Plant hormones, also known as phytohormones are chemicals that regulate plant growth, which, in the UK, are termed 'plant growth substances'.uxin, or indoleacetic acid (iaa), carries a very proficient relation to growth. It is in the midst of the most typical plant hormones and continues to be isolated from numerous plants. Studies with the response of plants to light, phototropism, are what led into the discovery and isolation of auxins.