biodiversity

Question 1

outline the roles of microorganisms in the nitrogen cycle

Answer 1

-nitrogen fixing bacteria - converts gaseous nitrogen into ammonia
-nitrifying bacteria - convert ammonium compounds into nitrates. nitrobacter then converts nitrites into nitrates

Question 2

outline role of organisms in the carbon cycle

Answer 2

-respiration of plants and animals add carbon dioxide into the atmosphere
-photosynthesis of plants removes carbon dioxide from the atmosphere
-decomposers decay plant and animal material into carbon dioxide

Question 3

what is sampling

Answer 3

selecting a group of individuals that will represent the whole target population. allows us to measure the distribution and abundance of organisms

Question 4

factors that limit the max size of a population

Answer 4

-food
-water
-light
-oxygen
-predators

Question 5

give reasons why we conserve and preserve habitats

Answer 5

economic - food source, natural pest control, boosts tourism
social-many organisms can be used in medicine, aesthetics
ethical- we have a responsibility to maintain habitats for future generations