Farming Practices And Production

Question 1

What do food chains and food webs show?

Answer 1

• How energy is transferred through an ecosystem.

Question 2

What do food chains show?

Answer 2

• Simple lines of energy transfer.

- Each of the stages is called a trophic level.

Question 3

What do food webs show?

Answer 3

• Lots of food chains in an ecosystem and how they overlap.

Question 4

What do decomposers do?

Answer 4

• Break down dead or undigested material, allowing nutrients to be recycled.

Question 5

How do insecticides reduce pest numbers?

Answer 5

• Kill insects that eat and damage crops.

- Killing insects means that less biomass is lost from crops, so they grow to be larger, which means that NPP is larger.

Question 6

How do herbicides reduce pest numbers?

Answer 6

• Kill weeds.
• Killing weeds remove direct competition with the crop for energy from the sun.
• It also remove the preferred habitat or food source of the insect pests, helping to further reduce their numbers and simplify the food web.