Chapter 2, Biological Classification, moves beyond Aristotle’s and Linnaeus’s two-kingdom system to explain R.H. Whittaker’s five-kingdom classification (Monera, Protista, Fungi,
Chitin, the material forming a fungal cell wall, and T.O. Diener’s discovery of viroids are among the specific facts tested
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Whittaker’s five-kingdom system anchors this Class 11 Biology chapter, grouping organisms from Monera to Animalia while placing viruses, viroids, and
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Chapter 1, Some Basic Concepts of Chemistry, establishes the laws of chemical combination and the mole concept, which together form
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Chapter 2, “Structure of Atom,” of the current NCERT Class 11 Chemistry (Part I) textbook builds the quantum mechanical picture
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J.J. Thomson’s discovery of the electron and James Chadwick’s discovery of the neutron open this set of questions on atomic
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Atomic models evolved from Thomson’s discovery of the electron through Rutherford’s nuclear model to Bohr’s orbits and finally the quantum
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Chapter 3 of NCERT Class 11 Chemistry, “Classification of Elements and Periodicity in Properties,” traces the historical development of the
Henry Moseley’s atomic-number-based periodic law, which replaced Mendeleev’s mass-based version, is the starting point for these questions. They go on
The periodic table’s history runs from Doebereiner’s triads through Newlands and Mendeleev to Moseley’s modern law based on atomic number,