Studies on Turbidity, pH and Microbial Presence in Water (Viva Voce) : Class 12 : Biology : Amrita Online Lab

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Studies on Turbidity, pH and Microbial Presence in Water

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	1)	What is turbidity?
		Amount of living organisms in water Strength of water Relative clarity of water Colour of water

	2)	The pH of pure water is ______at 25°C.
		8 6 5 7

	3)	We can measure the turbidity using __________.
		Turbo meter Secchi’s disk Raffo’s disk pH meter

	4)	What is the definition of pH?
		A measure of the relative amount of free hydrogen and hydroxyl ions in an aqueous solution. Negative logarithm of Helium ion. The strength of an aldehyde expressed in terms of hydronium ion concentration. Concentration of salt.

	5)	Why are green plants seen only in photic zones?
		Photic zone contains more nutrition. Oxygen is available only in photic zone. This layer of water is penetrated by sufficient sunlight for photosynthesis. It contains more suspended particles.

	6)	If the water body is more turbid then, _______________.
		it contains less suspended particles. light can penetrate in more depth. the thickness of its photic zone is less. the thickness of its photic zone is more.

	7)	Which is true of Buffer solutions?
		Are rarely found in living systems. Cause a decrease in pH when acids are added to them. Tend to maintain a relatively constant pH. Will always have a pH of 7.

	8)	Which of the following describes a non-productive water body?
		Has a very low density of phytoplankton per unit area. Bears a large number of organisms. Has high nutrient concentration. Has high amounts of dissolved oxygen.

	9)	How can the pH value of a water sample be determined?
		All the options are correct. By using universal indicator solution. By using a pH meter. By using pH paper strips.

	10)	The following figure illustrates the method of taking a Secchi’s disk reading. Find out the depth of photic zone using Secchi’s disc reading.
			80 cm 95 cm 85 cm 90 cm

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