Over Fishing & Biofuels

Question 1

Define Over Fishing

Answer 1

Removal of organisms from the marine environment at a rate which cannot be sustained by an environment

Question 2

What are the problems with over fishing? (4)

Answer 2

1. Estimating populations
2. Estimating catch
3. Predicting population change
4. Doesn’t consider ecology

Question 3

What are the ecological impacts with over fishing? (4)

Answer 3

1. Trophic interactions
2. Change in community structure
3. Loss of biodiversity
4. By catch and habitat disturbance

Question 4

What are the three key factors when considering a solution to overfishing ?

Answer 4

1. Large Enough
2. Protect source populations
3. Effectively enforced

Question 5

What are biofuels?

Answer 5

Any kinds of fuels which are biological in origin

Question 6

What is purpose of biofuels?

Answer 6

The use of biofuels is a method for reducing greenhouse gas emissions as it will reduce the need for use of fossil fuels.

Question 7

Why are biofuels carbon neutral?

Answer 7

Because the CO2 uptake through photosynthesis is equal to that given out during combustion

Question 8

What are the two draw backs of biofuels?

Answer 8

a) reduction of biodiversity because land to grow the biofuel is being gained by deforesting tropical rain forest
b) or the land is being taken from agriculturally productive food-growing land in countries where malnutrition is already a problem