Log in to make full use of the services
Which process will result in a gain of energy in an ecosystem?*
What is the primary source of energy for all the organisms in the ecosystem represented below?
Base your answers to questions 3 on the diagram below and on your knowledge of biology.
A factor not shown in the diagram that provides energy for living organisms is*
Some sea slugs store chloroplasts obtained from algae they have ingested. The chloroplasts continue to carry out photosynthesis within the slugs. What advantage would this activity be to these sea slugs?*
Which process uses energy to combine inorganic molecules to synthesize organic molecules?*
Base your answers to questions 6 on the diagram and information below and on your knowledge of biology. The diagram represents a germinating bean seed that has been split open.
Plants are able to continue to grow and develop once the starch supply in the seed is gone, because they*
A cell in the leaf of a corn plant contains more chloroplasts than a cell in the stem of a corn plant. Based on this observation, it can be inferred that, when compared to the cell in the stem, the cell in the leaf*
Base your answers to questions 8 on the information and diagram below and on your knowledge of biology.
An investigation was conducted to compare two different types of plants. A student used a microscope to observe the cells in a cross section of a lilac leaf (diagram A) and a cell from the leaf of a freshwater plant (diagram B).
Which row in the chart below correctly identifies the structure labeled Y in both diagrams and the process it performs?
In the 1660s, Flemish physician Jan van Helmont grew a small willow tree in a pot of soil. He added only water to the pot. At the end of five years, he found that the tree had gained 75 kilograms, but there was very little change in the mass of the soil. Van Helmont concluded that the plant gained weight directly from the water. We now know that this conclusion is only partially correct because, in addition to water, photosynthesis also requires*
During the process of photosynthesis, energy from the Sun is converted into*
The diagram below represents a cycling of materials.
Which row in the chart below shows the substances represented by X and Y?
Base your answer to question 12-14 on the information and photograph below and on your knowledge of biology.
The photograph below is part of an advertisement used by a company selling solar panels. The company claims that their panels, like plants, provide clean, renewable energy. They also claim that using solar panels will have a positive effect on the biosphere by reducing global warming.
Explain why these claims are valid. In your answer, be sure to:
• explain why both plants and solar panels provide renewable energy, rather than nonrenewable energy 
• state how the widespread use of solar panels to generate electricity can help to reduce global warming 
• state how the energy-capturing process used by plants worldwide can help to reduce global warming *
Base your answers to questions 15 on the information below and on your knowledge of biology.
Photosynthesis is a process that is important to the survival of many organisms on Earth.
State one reason why photosynthesis is necessary for animals to survive. *
Base your answer to question 16 on the information below and on your knowledge of biology.
A student measured oxygen and carbon dioxide concentration levels in an aquatic ecosystem during a 24 hour period. The data are represented in the graph below.
Identify two biological processes that are responsible for the production of varying amounts of carbon dioxide and oxygen within the aquatic ecosystem. 
Processes: ____________________________________ and ____________________________________*
Base your answers to questions 17 on the information, diagram, and data table below and on your knowledge of biology.
The laboratory setup represented below was used to investigate the effect of light on aquatic plants. Equal amounts of a green water plant were placed in beakers with gas- collecting tubes. The beakers were placed in a temperature-controlled environment. The light source was placed at different distances from the beakers. After an hour, the amount of gas collected from the plants in each tube was measured and recorded in the data table.
Directions: Using the information given, construct a line graph on the grid following the directions below.
Identify the gas being produced by the plants. *