In this article we will discuss about:- 1. Distribution of Sporopollenin 2. Chemistry of Sporopollenin 3. Production and Deposition 4. Functions. Distribution of Sporopollenin: It was first observed and named as "sporonin" by John (1814) and latter characterized by Berzelius (1830). Fossil green algae dating back to Devonian period have been shown to contain sporopollenin. The oldest sporopolleninous acritarchs occur [...]
In this article we will discuss about the tests that have proven to determine the viability and vigour of pollen after storage in plants. I. Test for Pollen Viability: An assessment of pollen viability is imperative factor in the study of reproductive biology, pollen storage and hybridization. Thus there must be a quick and dependable method to determine the viability [...]
The following points highlight the four main instruments that are used for collection of core samples. The Instruments are: 1. Hiller Borer 2. Russian Borer 3. Piston Sampler 4. Mackereth Sampler. 1. Hiller Borer (Fig.13.1): In this instrument the filling of sediment is done by turning the apparatus anti-clockwise. Here outer, loose jacket with a projecting lip remains stationary and [...]