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 monocot and dicot stem. Essay # 1. Monocot Stem: Some monocotyledons belonging to the family Liliaceae have arborescent habit with woody stems like Dracaena, Yucca, Cordyline, Agave, Aloe etc. They exhibit an anomalous secondary growth in thickness producing a cambium which is abnormal both in position and function. After the cease of [...]
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 [...]