Human_Eco_Quiz_3

A ________ is a structure built in order to store river or tidal water

• pond

• dam

• tank

Uses of Dams:

• controlling floods

• producing hydroelectric power

• supply water for irrigation, industry

• tourism

Advantages of dams:

• Reduce downstream flooding.

• Supply irrigation water for croplands.

• Water released from dams to generate electricity

• increase river silting below the dam.

Disadvantages of dams:

• Disrupt spawning and migration of some fish species.

• Reduce nutrients replishment of down stream flood plains.

• Permanently submerge large areas of forests and crop lands.

• Displace large number of native people.

An increased use of insecticides, pesticides and antibiotics has speeded up directional natural selection and caused genetic resistance in the pathogens

• TRUE

• FALSE

Use of fertilizers in agricultural fields interferes with the natural biogeochemical cycles.

• TRUE

• FALSE

Overgrazing by livestock results in soil erosion and increase in productivity.

• FALSE

• TRUE

Recently plantations of Jatropa curcare have become very popular for obtaining ______________.

• petrol

• biodiesel

• coal

Particulate matter like:

• soot

• radioactives

• Fine metal dust

Burning of plastics: Emit poly chlorinated biphenyles (PCBs) which are harmfull for lungs and __________

• vision

• stomach

• head