Font size
WorksheetsHuman_Eco_Quiz_2
Total questions: 12
Worksheet time: 7mins
______________ ecosystems are midway between natural and urban ecosystems
City
Agriculture
Village
Rural
Characteristics of rural ecosystems:
Rural areas are mostly free from air and noise pollution.
Drinking water is largely obtained from wells, canals, lakes
people live in small clusters in thatched, mud houses
Education , facilities are good
Aquaculture is the ________________ cultivation of aquatic plants or animals
natural
artificial
man made
machinery
_______________ include the extraction of food from the sea and the fresh water
Fisheries
marine
aquaculture
___________ is rearing of the aquatic organisms in artificially made water bodies
marine
fishery
aquaculture
_______________is cultivation of fish in a controlled environment often a coastal or inland pond, lake, reservoir or rice field
Fish culture
Fish ranching
Fish farming
Fish agri
___________ is a practice of keeping which fishes in captivity for the first few years in floating cages in coastal lagoons
Fish farming
Fish ranching
Fish culture
___________ and __________ which migrate to rivers to spawn are cultivated by fish ranching method.
Fish
Hilsa
Prawn
Salmon
Tilapia is also known as aquatic _________
animal
chicken
fish
organism
Merit of aquaculture:
Aquaculture reduces over harvesting of fisheries.
High yield in small volume of water.
High profit.
Improved qualities of fish obtained by selection and breeding
Demerit of aquaculture:
Loss of native aquatic biodiversity
Produces large amounts of fish wastes that pollute water bodies.
Aquaculture tanks or reservoirs are often get contaminated
Aquaculture fishes are very sensitive to pesticide runoff from croplands.
Milk fish and mullets are cultured in enclosures or ____________fences.
tropical
bamboo
grass
teak
