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Some activities that make use of biological resources, without involving their extraction or destruction, denote non- extractive use of biological resources. This includes ecotourism, wh ich involves a direct ‘transaction' between people and biological resources and fall into the category of direct use values. However, as it does not involve destruction or a change in the resource - in this case the natural areas visited by tourists - it can be classed as a non-extractive use. Likewise, scientific research in natural areas, bird watching and plant breeding are some other examples of non-extractive use of biodiversity.
What is photoperiod? Photoperiod is the daily time period of light exposure of a living being. The photoperiod might be vary according to the period of the year.
Explain what is Fern Allies - Lycopophyta ? Fern allies are those groups of vascular (with conducting vessels) plants that have close ties to the ferns. Sometimes they are refe
Q. What are astigmatism and presbyopia? Presbyopia is the visual impairment in which there is loss of the cililary muscle strength thus reducing the ability of the crystalline
Q. Explain the factors on which Spoilage of fish depends? i) The type offish. Different types of fish are susceptible to spoilage due to shape and size. A fat fish is suscept
Biotic Balance of Nature A nineteenth century Biologist is reported to have expressed, Glory of Britain is due to its old maids He reasoned Healthy Britons are nourished by roa
Explain Rickets Rickets:- A condition in children due to vitamin D deficiency.
Change in nucleus during cleavage
Advantages (1) Liquid and gaseous fuels can be manufactured from solid fuels. (2) Relatively cheap and easily available. (3) These are easy to transport. (4) A
The bacteria that cause dental cavities in humans break down sugars, releasing what chemical which causes tooth destruction? a) Acids b) Bases c) Enzymes d) Monosaccha
PHYLUM PLATYHELMINTHES Definition and Introduction Bilateral and protostominal organ grade eumetazoans without a body cavity ( acoelomates) platyhelminthes means fl
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