educationtech

  Classification and Distribution of Gymnosperm in India  Phanerogams are the collective term for gymnosperms and angiosperms (phanero = exposed, gams = sex organs or spermatophytes; sperma = seed). • Plants with bare seeds are known as gymnosperms. The ovules in gymnosperms are openly visible both before and after fertilization. They are not contained by the ovarian wall. of contrast, the ovule or ovules of angiosperms are entirely encased within a structure known as the ovary. For this reason, only naked seeds are produced in gymnosperms instead of fruits, but in angiosperms, seeds are produced inside fruits. • Coulter and Chamberlain (1910) divided gymnosperms into 7 orders. Some of the orders are extinct today.  The seven orders are as follows:  1. Cycadofilicales (extinct)  2. Bennettitales (extinct)  3. Cycadales (Mesozoic to present day)  4. Cordaitales (extinct)  5. Ginkgoales (Palaeozoic to present day)  6. Coniferales (Palaeozoic ...

  Watson and Crick Model of DNA  Many people think that in the 1950s, English physicist Francis Crick and American biologist James Watson discovered DNA. This is not the situation in actuality. Rather, Swiss chemist Friedrich Miescher discovered DNA for the first time in the late 1860s. Then, in the decades that followed Miescher's discovery, a number of studies conducted by other scientists—most notably,  Phoebus Levene and Erwin Chargaff—uncovered more information about the DNA molecule, including its main chemical constituents and the ways in which they interacted with one another. Watson and Crick may never have come to their ground-breaking conclusion in 1953—that the DNA molecule exists as a three-dimensional double helix—without the scientific groundwork laid by these pioneers. https://educationtechbysapna.blogspot.com/2024/04/structure-and-function-of-cyphellae-and.html The year 1869, albeit little known to most, was a turning point in the history of genetics stud...

The Ultimate Prokaryotic vs. Eukaryotic Cells Comparison  Prokaryotes are always unicellular, whereas eukaryotes are frequently multicelled organisms; additionally, eukaryotic cells are larger and more complex than prokaryotic cells by an order of magnitude; and finally, eukaryotic DNA is stored in the nucleus of eukaryotes, whereas prokaryotic DNA is stored in the cytoplasm. The Greek words "eu," which means "good," and "karyon," which means "kern," are the roots of the phrase "Eukaryotes," which means "good or true nuclei." Compared to prokaryotes, eukaryotes are larger and more sophisticated.  All the great kingdoms are included, with the exception of Kingdom Monera. Eukaryotes are structurally unique in that their cell walls support and shield the plasma membrane. The plasma membrane, which encloses the cell, regulates the admission and departure of specific molecules. DNA, which is found in the nucleus, is what stores all...