The Idukki Dam is a double curvature Arch dam constructed across the Periyar River in a narrow gorge between two granite hills locally known as Kuravan and Kurathi in Kerala, India. It is one of the highest arch dams in Asia.

Slave dynasty, (1206–90), line of sultans at Delhi, India, that lasted for nearly a century. Their family name was Muizzi. The Slave dynasty was founded by Quṭb al-Din Aibak, a favourite slave of the Muslim general and later sultan Muḥammad of Ghur.

 At 19336 feet, the snow-capped Mount Kilimanjaro in Tanzania is Africa’s highest peak and the world’s tallest free-standing mountain. At 5895m, Uhuru Peak remains the highest point in all Africa and marks the spot of the jauntily angled summit sign where weary travelers are seen snapping their ‘victory’ photograph.

Chronometers are used in scientific experiments, navigation, and astronomical observations. It was the invention of a chronometer capable of being used aboard ship, in 1762 that allowed navigators for the first time to accurately determine their longitude at sea.

Molecule is the smallest particle of an element or compound that can have a stable independent existence. A molecule is an aggregate of atoms held together by relatively strong forces called chemical bonds.

Prokaryotic cells are less organized than eukaryotic cells. They lack a nuclear membrane around their DNA. Instead, their DNA floats in the cytoplasm. The DNA of a prokaryotic cell has a circular shape-it does not form X-shaped chromosomes.

Mendel's Law of Dominance can be simply stated as: “In a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are hybrid for a trait will have only the dominant trait in the phenotype.”

Vestigial organs are those organs which are no longer in use but are present in our body since our ancestors had them. Appendix, Coccyx and External ears are some of the examples of vestigial organs.

 Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxins promote stem elongation, inhibit the growth of lateral buds and maintain apical dominance. They are produced in the stem, buds, and root tips.

Raja Ram Mohan Roy is regarded as the Father of Modern India who founded the first religious reform organisation i.e. Brahmo Samaj in 1828.The two most prominent leader of the Brahmo Samaj were Debendranath Tagore and Keshab Chandra Sen.