Unit 2 Formative 2 Cremeans

Phytoplankton are plant-like microscopic organisms that float in bodies of water such as the ocean. They take in Carbon Dioxide during the process of photosynthesis. What would most likely happen if the population of phytoplankton was destroyed?

• Sea temperatures would decrease

• Greenhouse gases would increase

• Atmospheric oxygen would increase

• Sea levels would drastically decrease

Which of the following processes is part of the carbon cycle?

• Decomposers put carbon into the soil by breaking down organic material

• Factories remove carbon from the atmosphere by burning materials

• Plants put carbon back into the atmosphere through the process of photosynthesis

• Animals remove carbon from the atmosphere through the process of respiration

Nitrogen is a nutrient needed by plants for growth. Nitrogen is naturally cycled into the soil where it is rapidly absorbed by plants. What would a farmer most likely do to replenish Nitrogen that was depleted from the soil?

• Use water that is enhanced with phosphates

• Add fertilizer to the soil to provide a source of nitrogen

• Use genetically altered crops that fix their own nitrogen

• Add bacteria to the soil in order for the crop to grow stronger roots

What happens to the amount of energy available to organisms when moving from trophic level 1 (producers) to trophic level 2 (primary consumers)

• The energy decreases by approximately 90%

• The energy increases by approximately 90%

• The energy decreases by approximately 10%

• The energy increases by approximately 10%

Which mechanism helps carbon to cycle from the atmosphere to living organisms?

• tissue decomposition

• cellular respiration

• photosynthesis

• transpiration

Organisms from which niche contain the greatest amount of energy?

• Producers

• Primary consumers

• Secondary consumers

• Decomposers

A plant gets the energy it needs from the Sun. The plant uses about 10% of the energy to carry on its life functions. The plant transfers approximately 10% of the energy to the consumers in the food chain. What happens to most of the remainder of the energy?

• It is reabsorbed by the Sun

• It is recycled by decomposers

• It is stored in soil for later use

• It is released into the ecosystem as heat

Energy from the Sun enters ecosystems through the transformation of light to chemical energy. This energy is available to different organisms based on the trophic level in which the organisms exist. Which statement best describes the availability of energy for organisms in different trophic levels?

• Available energy increases as trophic levels increase

• Available energy decreases as trophic levels increase

• Primary consumers have the least energy available

• Tertiary consumers have the most energy available

Which products are produced during photosynthesis?

• chloride and sugar

• oxygen and sugar

• nitrogen and sugar

• carbon dioxide and sugar

How will clear-cutting of forests affect the level of carbon dioxide in the atmosphere

• It will decrease because of increased respiration

• It will increase because of decreased photosynthesis

• It will decrease because of decreased photosynthesis

• It will remain constant as respiring animals remove the carbon dioxide