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With reference to cold water corals, which of the following statements is/are correct? 1. They do not require Zooxanthellae to survive. 2. Worldwide distribution of cold water coral reef is areater than tropical reef. Select the correct answer using the code given below (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2
Answer C Cold-water corals extend to deeper, darker parts of the oceans than tropical corals, ranging from near the surface to the abyss, beyond 2,000 metres where water temperatures may be as cold as 4 They inhabit deep water, not shallow water. Like tropical corals, they provide habitat to other species, but deep-water corals do not require zooxanthellae to survive (statement 1 is correct). water coral reefs worldwide than tropical reefs. .Their extent is much larger than their tropical counterpart. Some, as the various individual reefs stretching from Norway as far south as West Africa, are when combined far bigger than more famous tropical ones such as Australia"s Great Barrier Reef. (statement 2 is correct).
With reference to the Atomic clock, consider the following statements. 1. It is the most accurate time measurement device 2. It is used in the navigation satellite systems. Which of the statements given above is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2
. 33. Statement 1 is correct. An Atomic clock is the most accurate type of clock which is regulated by the vibrations of an atomic or molecular system such as caesium or ammonia. physics it uses the microwave signal that electrons in atoms emit when they change energy levels. . Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. .It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change.
Statement 2 is correct. They provide accurate time and frequency standards and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS. Recently three atomic clocks on-board a single satellite of the NAVIC Indian regional navigation satellite system have failed and efforts are being taken to rectify/replace the clocks.