Biodiversity

Question 1

Suggest two reasons why the no of species identified is likely to be lower than the actual number of species present on earth?

Answer 1

1. Not all species have been found and discovered

2. Species are microscopic and hard to see

Question 2

Compare the changes in total no of species assessed with the changes in total number of threatened species over 10 year period:

Answer 2

Both show an increase

There is a widening gap between those that are assessed and treated.

Question 3

State the two aims of these conservation groups:

Answer 3

CITES:

1. Prohibit trade if endangered species
2. Make it illegal to kill endangered species and or event harm them.

RIO CONVENTION:

1. Sustainable use of organisms
2. Share genetic resources

Question 4

State one way of improving productivity that can be used my Morden farmers:

Answer 4

Vaccinations

Question 5

How organic fertilisers increase the yield of plant crops:

Answer 5

Provide more nutrients in the soil which helps with the plants growth. This can produce minerals, nitrates and phosphate until growth becomes a limiting factor.

Question 6

How excessive use of inorganic fertilisers on farmland can cause a reduction in biodiversity:

Answer 6

• can cause plants to grow more and some plants can grow more than others
• this can cause competition between the plants and will cause Some plants to die out
• this disrupts the food chain

Question 7

Why a reduction in biodiversity can become a problem in agriculture:

Answer 7

• loss of genetic diversity
• losss of predators
• less likely to adapt to abiotic factors like temperature