Populations and ecosystems mistakes

Carrying capacity

Maximum population that an environment can support

Plagioclimax

A climax community where human activity has stopped succession from proceeding

What is meant by the term gross primary productivity?

GPP is the rate of conversion of light energy into chemical energy by photo synthesis

Explain the effect an increase in temperature has on NPP

NPP will decrease as rate of respiration will increase as more glucose is broken down by respiration than is produced by photosynthesis

Why does tropical marine/ lake ecosystems have more trophic levels than terrestrial

Less energy wasted in cold blooded animals

Higher temperature so higher rate of Photosynthesis

Distinguish between primary and secondary succession

Primary: environment not previously colonised/ from bare rock

Secondary : environment has soil/ previously inhabited

How does changes to vegetation occur during succession

The invading / dominant species change the cell chemistry/ named change

Giving them a competitive advantage, so are better suited to the environment.

How does bacteria increase availability of compounds of nitrogen in the soil

Nitrogen fixation

Amino acids and protein

Decomposition

Why is it important for plants that ammonia is converted to nitrate?

To be able to be absorbed by root hair cells/ plants by active transport

Used to synthesize amino acids/ proteins/nucleic acids

To convert toxic ammonia to nitrate

Why do farmers want to drain their land?

Aerobic conditions encourages nitrification/ anaerobic conditions encourages denitrification

Which decreases soil fertility/ less crop growth OR increases soil fertility

What is meant by the photosynthetic efficiency of a plant?

The measure of how well a plant is able to convert light energy into chemical energy/ biomass

Difference between GPP and NPP

GPP= total energy transferred by a plant

NPP = total energy in biomass minus the energy lost in plant respiration

Why are farming herbivores less efficient than growing crops?

Energy is lost to the next trophic level to respiration/ excretion/ movement

State density independent factors that can affect the growth of microscopic organisms

Temperature

pH

Difference between density dependent and independent factors.

Dependent - death rate greater if population size is greater

  independent- death rate is the same whatever the size of the population

How do legumes benefit rhizobium ?

By synthesizing carbohydrates/ leghaemoglobin which provides anaerobic conditions for the bacteria