Organisms and their Environment Quiz

What abiotic factor is the initial energy source in most food webs?

• producers

• sun

• bacteria

• rain

Most of the minerals within an ecosystem are recycled and returned to the environment by the direct activities of organisms known as?

• producers

• consumers

• scavengers

• decomposers

The symbiotic relationship between a flower and the insect that feeds on its nectar is an example of?

• mutualism because the flower provides the insect with food and the insect pollinates the flower

• commensalism because the insect lives off the nectar but the flower does not benefit

• parasitism because the insect harms the flower by removing the nectar

• predation because the insect feeds on the flower and the flower dies

Plants transform energy from the sun into?

• nuclear energy

• solar energy

• chemical energy

• mechanical energy

Use the diagram representing different stages in succession to answer the question. Select the order that represents how succession progress in an ecosystem.

• I, II, III, IV

• II, IV, I III

• IV, II, I, III

• III, IV, II, I

Which of the following human activities reduces biodiversity?

• prohibiting hunting in wildlife reserves

• collecting tissue samples from endangered species in the area

• planting native grass species to prevent erosion

• planting one type of tree to replace native forests cut for lumber

What paired factors below are the most important in determining the type of vegetation that is present in a natural ecosystem?

• soil and water

• landforms and soil

• water and temperature

• temperature and soil

Which of the following adaptations would LEAST likely help a plant survive in a hot, dry environment?

• opening their stomata at night

• grow long shallow roots

• have needles instead of leaves

• have thin large leaves on branches

There is a limit to how large any given population can grow. Which of the following statements best explains why a population must eventually stop growing?

• a low female-to-male ratio develops as the population grows

• older individuals outnumber the younger members of the population

• natural selection causes the gene pool to shift as the population increases

• the available resources necessary for life are used up by the population as it grows

Use the graph showing the number of organisms in an area over to time to answer the question. During which year did the population reach its carrying capacity?

• year 2

• year 3

• year 6

• year7