Chapter: Science & Technology
Name the scientist who first used a glass prism to obtain the spectrum of sunlight.
In the late 17th century, Isaac Newton conducted groundbreaking experiments on light using a glass prism. He demonstrated that white light is composed of multiple colors, thus establishing the foundation for modern optics.
Remember: "NPS" for Newton's Prism Spectrum. N for Newton, P for Prism, S for Spectrum.
Verified against "Optics" by R. K. Ghosh, highlighting the historical significance of Newton's prism experiment.
Equal volume of all gases, when measured at the same temperature and pressure, contain an equal number of particles. Who proposed the above law ?
Avogadro’s Law: States that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules.
- In 1811, Amedeo Avogadro proposed this fundamental principle in gas theory.
- The law relates directly to the concept of molar volume, highlighting that 1 mole of any gas occupies a volume of approximately 22.4 liters at standard temperature and pressure (STP).
Remember: Amedeo is All about equal volumes and Avogadro’s law!
Verified against NCERT Class XI Chemistry, Chapter 1 (Some Basic Concepts of Chemistry).
Initial discovery of antibiotic penicillin was done by
Option D is correct. Alexander Fleming discovered penicillin in 1928.
Penicillin, the first true antibiotic, was discovered by Alexander Fleming when he observed its effects on bacteria, leading to a revolutionary change in medicine.
Remember: "Fleming Found Fungus" to recall that Alexander Fleming discovered penicillin from the Penicillium mold.
Alexander Fleming is credited with the discovery of penicillin, which initiated the antibiotic revolution.
Who among the following popularized the use of embryological characters in taxonomy?
Embryology is the study of embryos and their development. It provides critical insights into developmental biology and evolutionary relationships, aiding in the classification of organisms.
Panchanan Maheshwari emphasized the importance of embryological characters, which allow taxonomists to classify organisms based on developmental stages rather than solely morphological traits. This approach aids in revealing phylogenetic relationships.
Remember the acronym PEP for Panchanan, Embryology, Popularization to recall his contribution.
A flowchart indicating the stages of embryonic development in various organisms, illustrating how embryological characteristics influence classification.
Verified against NCERT Class 11 Biology, Chapter on Classification and Taxonomy.
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