STRUCTURE AND FUNCTIONS OF AN ECOSYSTEM : RESERVOIR ECOSYSTEM1.What is initial fertility?A.It is the first stage of reservoir fertility when gradual imudation causes an initial surge of biota.2.What is an impoundment?A.A barrier built across a river or a stream to make reservoirs for use in various purposes like generation of hydel power, fishery, etc.3.What is meant by biotic community?A.It is the community of living organisms thriving in an ecosystem.4.What is trophic depression?A.It is a stage in reservoir fertility caused by gradual diminution of the rate of nutrient release.5.How does trophic depression set in?A.Trophic depression mainly sets in due to continuous sedimentation on the reservoir bed.6.Name some agents that cause diminishion of nutrients in a reservoir.A.a) Aquatic vegetationb) Continuous sedimentation7. What is final fertility?A. A stage of fertility of a reservoir when accumulation of organic substances at the bottom of a reservoir helps in regaining fertility.8. What is fertility of an ecosystem?A. Presence of nutrients in an ecosystem that furnish growth of living organisms in an ecosystem. 9. What is metamorphic character of a reservoir?A. Metamorphic character pertains to the type and composition of rock beds, shape and size of reservoirs etc.10. What is pH?A. Quantitative measure of the strength of the acidity or alkalinity of solution. It is defined as a negative common logarithm of the concentration of hydrogen ions (H+) in a solution.11. What is productivity?A. The rate of organic matter accumulation in living component of an ecosystem in unit time. 12. What is trophic level?A. The functional level occupied by an organism in any food chain.13. What is food chain?A. A series of organisms arranged in a linear manner with repeated eating and being eaten.14. List any three physiochemical characteristics of soft water reservoir.A. a) pH value ranges between 3 to 6 b) Bound CO2 as carbonate in less than 9 to 10 ppm c) Total alkalinity in up to 20 ppm15. What is ppm?A. It is parts per million which is a unit of quantitative measurement of substances in a relative manner e.g. amount of salt in a solution.16. What is the characteristic feature of a medium water reservoir?A. The characteristic feature of a medium water reservoir is that highest productivity is met with at a neutral pH (i.e. pH 7).17. What is the characteristics feature of a hard water reservoir?A. In hard water reservoir highest productivity is met with an alkaline pH of 8.5 upwards.18. What is a thermocline?A. A layer of water in a lake or reservoir lying between epilimnion and hypolimnion. In this layer of satisfaction temperature decrease is rapidly with increasing depth.19. What is epilimnion?A. Epilimnion is the warmer uppermost layer of water above the thermocline in a lake.20. What is hypolimnion?A. It is the layer of colder non-circulating water usually near the bottom of a lake or reservoir.21. What is metalimnion?A. This is a zone between epilimnion and hypolimnion where thermal satisfaction is highest developing into a thermocline or gradient of rapid decrease in temperature.22. What are the 3 zones formed due to light penetration in a reservoir?A. The 3 zones formed due to light penetration are – a) Littoral b) Limnetic c) Aphotic23. Which zone may also be called as the open water zone?A. Limnetic zone.24. Name 3 layers of thermal stratification in a reservoir.A. Epilimnion; Metalimnion; Hypolimnion.25. Which zone is absent in shallow reservoirs?A. Limentic zone or the open water zone.26. Name some nektons.A. Some nektons or organisms swimming in water are tadpoles, fisheries, etc.
Posted on: Thu, 13 Nov 2014 01:59:33 +0000
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