In this essay we will discuss about archaeopteris which belongs to the family of progymnospermopsida. After reading this essay you will learn about:- 1. Habit of Archaeopteris 2. Morphology of Archaeopteris 3. Stem Anatomy 4. Reproductive Organs. Essay # 1. Habit of Archaeopteris: Large trees up to 18 m high with a large crown of spirally arranged pseudomonopodial branches (Fig. [...]
In this essay we will discuss about the process of germination of common seeds. Essay # 1. Epigeal Type of Seeds: a. Germination of an Exalbuminous Dicotyledonous Seed: Gourd (Cucurbita Maxima of Cucurbitaceae): Initially, after soaking water, the radicle comes out of the seed, goes straight downward and fixes the seed with the soil. The hypocotyl next grows very quickly [...]
In this essay we will discuss about the classification of meristems. Essay # 1. Classification on the Basis of Development: Promeristem or Primordial Meristem: It is the very fundamental stage of meristem action. It initiates new organs and tissues, it is also known as embryonic meristem. It comprises the apical initials and their immediate derivatives. As soon as the cells [...]