The following points highlight the four main types of underground modified stems. The types are: 1. Rhizome 2. Tuber 3. Corm 4. Bulb. Type # 1. Rhizome: It is a fleshy modified stem which grows horizontally beneath the surface of the soil. It has distinct nodes and internodes and minute scale leaves at the nodes. Lateral buds come out as [...]
The following points highlight the two main types of seed. The types are: 1. Dicotyledonous Seeds 2. Monocotyledonous Seeds. Type # 1. Dicotyledonous Seeds: i. Gram Seed: The gram seed is more or less rounded at one end and pointed at the other. It is covered by a brown seed coat called testa; the inner whitish coat is the tegmen. [...]
The following points highlight the three main parts of a leaf. The parts are: 1. The Leaf-Base 2. The Petiole 3. The Lamina. Part # 1. The Leaf-Base: It is by no means a conspicuous part of the leaf. Some leaves like those of the pea, sensitive plant, mango have swollen leaf-bases. Such a leaf- base is called pulvinus (Fig. [...]