Read this essay to learn about the meaning and significance of root-stem transition. Essay # 1. Meaning of Root-Stem Transition: The change in orientation of vascular tissues from exarch radial type in root to endarch and conjoint collateral type in stem is designated as root-stem transition. The continuity between the vascular strands of roots and stems is maintained but the [...]
Read this essay to learn about:- 1. Meaning of Shoot Apex 2. Angiosperm Shoot Apex 3. Gymnosperm Shoot Apex 4. Shoot Apex of Pteridophytes. Essay # 1. Meaning of Shoot Apex: The shoot apex proper is considered as the region of initiation of the primary organisation of the shoot in which the processes of unlimited growth take place. This region [...]
In this essay we will discuss about the external and internal secretory structures of plant tissues. Essay # 1. External Secretory Structures of Plant Tissues: External surfaces of the plant bear several secretory structures of epidermal origin or epidermal derivatives or emergences from deeper tissues. These include glands, glandular trichomes, nectaries, osmophores, hydathodes and salt glands. a. Glandular Trichomes: The [...]