The following points highlight the three main types of structures of root-apex according to plant groups. The types are: 1. Root Apex of Pteridophyte 2. Root Apex of Gymnosperm 3. Root Apex of Angiosperm. Type # 1. Root Apex of Pteridophyte: Most of the vascular cryptogams have a promeristem with a single apical cell. But some members of Marattiaceae exhibit [...]
This article throws light upon the top two types of structures for green houses. The types are: 1. Temporary Structures 2. Permanent Structures. Type # 1. Temporary Structures: Cold or Storage Pits: In early times, pits used to dig about 90 cm deep to store the pot plants or germinating seedlings, the top was covered with transparent material or glass [...]
The following points highlight the eight different structures of water vascular system in Asterias. The structures are: 1. Madreporite 2. Stone Canal 3. Ring Canal 4. Polian Vesicles 5. Tiedmann's Bodies 6. Radial Canals 7. Lateral or Podial Canals 8. Tube-Feet (Podia) and Ampulla. Structure # 1. Madreporite: The water vascular system starts with the madreporite and gives off a [...]