The following points highlight the five major reasons of anomalous secondary growth in plants. The reasons are: 1. The Activity of Normal Cambium is Abnormal 2. Abnormally Situated Cambium Forms Normal Secondary Vascular Tissues 3. Formation of Secondary Tissues by Accessory Cambium 4. Formation of Interxylary Phloem 5. Formation of Intra-Xylary Phloem. Reason # 1. The Activity of Normal Cambium [...]
In this article we will discuss about the process of abscission in plants, explained with the help of suitable diagrams. Abscission is a process that initiates the removal of a part of plant following the formation of a protective layer or scar tissue that prevents the entry of pathogen and protects the inner tissues from desiccation. Plants are shedding organisms. [...]
In this article we will discuss about the secondary growth in monocotyledonous stem. Most monocotyledons consist entirely of primary tissues. The usual vascular cambium is absent from this group and so there is no normal secondary growth. However, in some monocots, the thickening and elongation of stem occurs through primary thickening meristem, diffuse secondary thickening and secondary thickening meristem. Primary [...]