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12 Cards in this Set

  • Front
  • Back

Use your knowledge of succession to explain the increase in biomass of an area in the first 20 years of succession [3]

-Pioneer species

-Changes abiotic conditions

-increasing diversity of species

Suggest three reasons for woodland conservation [3]

-To protect habitats and niches

-To protect endangered species

-To reduce the effect of global warming

Name the process which results in woodland developing from farmland [1]


Explain the increase in the diversity of birds as a woodland area develops [3]

-Greater variety of insect species

-more sources of food

-greater variety of niches

Suggest two reasons why a species could rapidly become dominant after being introduced to a new environment [2]

-few consumers

-outcompetes competitors

Suggest two economic consequences of a species becoming dominant in a new environment [2]

-Cost of removal

-Cost of restoring ecosystem

Name the pioneer species in this diagram [1]

Name the pioneer species in this diagram [1]

-Ulva lactula

Use this diagram to explain the process of succession [4]

Use this diagram to explain the process of succession [4]

-Pioneer species Ulva increases then decreases

-Changes conditions to make them less hostile

-Gigartina canacliculata is better adapted to compete so Ulva outcompeted

-Process repeats until G. coulteri becomes climax species and increases in abundance

The Amazonian forest today contains a very high diversity of bird species. Over the last 2,000,000 years, long periods of dry climate caused this forest to separate into a number of smaller forests. Different plant communities developed in each of these smaller forests. Each time the climate became wetter again, the smaller forests grew in size and merged to reform the Amazonian forest. Use this information to explain how a very high diversity of bird species has developed in the Amazonian forest. [5]

-No interbreeding because of geographical isolation


-Because of different selection pressures

-So adapted organisms survive and reproduce

-which changes allele frequencies

Speciation is less frequent in a stable environment. Explain why [1]

-Similar environmental factors so less selection pressure

The populations of lizard species vary at different times throughout the year. Suggest two reasons why [2]

-Breeding seasons

-Temperature varies with season

Changes in ecosystems can lead to speciation. A high concentration of copper in soil is toxic to most plants. In some areas where the soil is polluted with copper, populations of grasses are found to be growing. These populations of grass belong to a species also found growing on unpolluted soils. It has been suggested that a new species of grass may evolve on soil that has been polluted with copper. Explain how this new species might evolve. [5]


-through mutation

-Some plants have allele to survive high copper concentration

-adapted organisms survive and reproduce

-increase in frequency of allele

-no interbreeding with other groups