The Nature of Viruses All viruses have the same basic structure consisting of a core of nucleic acid surrounded by protein. This structure lacks cytoplasm, and it is not a cell. Individual viruses contain only a single type of nucleic … Read more
110 genera, 3,100 species Widespread but best represented in the Northern Hemisphere, mainly in the temperate and arctic climate. Salient features: Herbs shrubs or trees’ leaves are usually serrate, stipules conspicuous, flowers actinomorphic, usually perigynous and numerous, carpel is single … Read more
321 genera, 7,770 species (including Phyllanthaceae) Distributed widely in tropical and subtropical regions, with few species in temperate regions. Salient features: Plants usually a milky latex, alternate leaves, flowers unisexual, carpels 3, ovary superior, 3-chambered, ovule with a caruncle. Major … Read more
Ethylene (H2C = CH2)—a gas that is formed in plant organs, being an inhibiting hormone and an auxin antagonist. It was found in plants and fungi and does not occur in bacteria, algae, and animals. It is considered the maturation … Read more
Is an inhibitor of growth with retardant action. It is present in all plant tissues. Abscisic acid is an antagonist of auxin, gibberellins and cytokinins. It accumulates in large quantities during autumn, in the period of transition to a state … Read more
Cytokinins Cytokinins are plant hormones that regulate various physiological processes in plants, including cell division, differentiation, and growth. They have a number of practical applications in agriculture, forestry, and horticulture. This group of hormones includes kinetin, benzyl amino purine, zeatin, … Read more
