Sources of Food II

Plants get their energy from the ________.

• air

• sun

• soil

• water

The following are intensive methods of food production except ______.

• aeroponics

• fish farming

• hydroponics

• slash-and-burn

The main negative effect of using pesticides on crops is ________.

• increasing crop yield

• killing of unwanted pests

• pollution of water sources

• resistance of crops to diseases

Fertilisers in excess can damage the environment in the following ways except ______.

• negative impact on aquatic life

• algae bloom

• contamination of drinking water

• soil erosion

Which of the following can be used to regulate the ripening of fruits?

• fertilisers

• hormones

• sunlight

• oxygen

The following is an example of a food chain.                                            

grass  -->   insect  -->  frog --> snake

 

If pesticides are used to kill the insects, what will happen to the animals in the food chain?                 

• All animals die.

• After some time, there will be lesser frogs and more snakes.

• After some time, there will be less frogs and snakes.

• The plants will stop growing.