Producers and Consumers

The trees in a deciduous forest environment are both tall and short. The environment where the trees grow is hit by a severe drought, killing most of the tall trees. The following year, there is a normal amount of rain. Which of the following will most likely occur?

• The smaller trees will perish.
• The sunlight reaching the smaller trees decreases.
• The smaller trees will increase in height.
• The rain reaching the smaller trees decreases.

Which of the following is NOT needed for a producer to make its own food?

• sunlight
• water
• carbon dioxide
• oxygen

This is a chart listing some of the organisms in the Tundra ecosystem. Which food chain correctly identifies the flow of energy?

• berries --> arctic fox --> ringed seal --> salmon
• polar bear --> caribou --> grasses --> sun
• lichen --> lemming --> arctic fox --> polar bear
• wold --> arctic hare --> berries

A student has not done the final measurement for a plant in an investigation. How tall is the plant if rounded to the nearest cm?

• 14 cm
• 13.9 cm
• 13.4 cm
• 13 cm

Food provides animals with the materials and energy they need for growth, warmth, and motion. Plants get material for growth mostly from air and water, and obtain energy from sunlight. Producers provide food to consumers because ___.

• plants can easily make food from soil and water
• animals cannot produce their own food
• plants are more abundant in ecosystems
• many animals prefer eating plants to eating meat

The Houston Toad's habitat was destroyed. The loss of habitat for the Houston Toad most likely affected the food web by ___.

• causing an increase in the number of opossums
• causing a decrease in the number of armadillos
• causing an increase in the number of insects
• causing a decrease in the number of wildflowers

A food web diagram is actually a model. It is a representation of what may occur in nature. Which of the following is NOT a limitation of this model?

• It contains organisms typically found in a particular ecosystem
• The original source of energy for the web is not included.
• It underestimates the complexity of the interactions among these species.
• It may contain some inaccurate information about the interactions among these species.

Which is the most valid conclusion for an investigation on plants and light?

• Plants that receive at least six hours of light grow the best.
• The more light a plant receives, the more the plant's height increases.
• Plants need no more than four hours of light to grow the most.
• Plants receiving two hours of light have the greatest increase in height.

Producers use sunlight, water, and carbon dioxide in the process of making their own food. Which of the following options correctly matches the components of the process shown in the diagram?

• 1-energy   2-water   3-carbon dioxide   4-oxygen
• 1-energy   2-oxygen   3-water   4-carbon dioxide
• 1-water   2-oxygen   3-carbon dioxide   4-energy
• 1-carbon dioxide   2-water   3-oxygen   4-energy

Which of the following would have the greatest impact on the food web if it were removed?

• rabbit
• oak tree
• chipmunk
• deer