Unit 7: Summative Assessment

Front

Which conclusion about yellow Indian grass is best supported by the data in the graph?

Back

Yellow Indian grasses growing at a high density compete for nitrogen in the soil, reducing the grasses’ mass.

Front

The diagram is incomplete. Which statement best describes how the student should complete the diagram? Options: Draw arrows to represent the input from other energy sources. Draw an arrow to indicate energy flow from consumers to producers. Draw arrows to represent the energy transfer to the environment at each level. Draw an arrow to indicate energy flow from decomposers back to producers.

Back

Draw an arrow to indicate energy flow from decomposers back to producers.

Front

According to the data in the graph, which statement best explains the change in the reindeer population from 1963 to 1966? Options: A warm summer and mild winter on St. Matthew Island caused lichen growth that led to a great increase in the reindeer population. A disease that only affected very old reindeer arose on St. Matthew Island and so the reindeer population remained stable. A severe winter on St. Matthew Island and high demand for lichen combined to cause a high death rate in the reindeer population. The lichen on St. Matthew Island gradually attracted other reindeer from the mainland and so the reindeer population grew slowly.

Back

A severe winter on St. Matthew Island and high demand for lichen combined to cause a high death rate in the reindeer population.

Front

The following graph shows the carbon dioxide (CO₂) concentration in pond water at different times of the day. Which explanation best describes the varying amounts of CO₂ at different times of the day?

Back

Photosynthesis occurs in aquatic plants during the day when the sun is out.

Front

Which statement best describes the role that bacteria play in cycling matter throughout this ecosystem?

Back

Bacteria break down dead matter into nutrients.

Front

Which statement is the most likely reason photosynthesis does not occur in the deepest aphotic zone? Options: Sunlight for photosynthesis does not reach the deepest aphotic zone., Water pressure limits the survival of animals in the deepest aphotic zone., Not enough soil is present to support plant growth in the deepest aphotic zone., Not as much dissolved oxygen from the surface reaches the deepest aphotic zone.

Back

Sunlight for photosynthesis does not reach the deepest aphotic zone.

Front

Which of the following statements about the food web are true? I. The Praying Mantis is a primary consumer because it eats grasshoppers. II. All of the energy from the squirrel is passed to the hawk when it gets eaten. III. The hawk is considered a tertiary consumer in this food web.

Back

III only

Front

Which of the following are true about grasses?
I. They are autotrophic.
II. They are at the base of a trophic pyramid.
III. They are producers.

Back

I, II and III

Front

Which of the organisms in the food web is a primary consumer? Grass, Grasshopper, Sparrow, Fox, Praying mantis

Back

Grasshopper

Front

If 10,000 units of energy are available to the grasses, approximately how much energy is available to the mice?

Back

1000 units