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video INTERACTION IN PLANTS TROPISMS NASTIES ASEXUAL REPRODUCTION Sexual reproduction in plants Parts of a root Secondary roots are not as thick and tend to grow sidewards. The primary root is the thickest and grows downwards. Root cap Root hair section, part of the root on which the root hairs are located, they absorb water and nutrients from the soil. Elongation section, set of cells that determine the growth of the root. Taproot A main root that grows vertically into the soil. Fibrous roots Root formed in bundles where it is not possible to determine the primary root. PARTS OF A STEM Terminal bud Lateral buds Nodes Internodes Herbaceous stems Woody stems Shrub Tree Underground stems Tuber Bulbs Rhizomes Most leaves are thin and flat like this: Vein Blade Upper surface Lower surface Petiole Stomata According to the According to the shape of the leaf divison of limb Simple leaf Compound leaf Spearshaped Ovate According to the leaf veins Entire leaf Heart-shaped Pinnate veins Lanceolate According to the limb margins Parallel veins Palmate veins Lobed leaf Serrated leaf TYPES OF FLOWERS Mosses Liverworts FERNS Cedar pine Fir cypress Angiosperm