GED GED-Science Exam With Confidence Using Practice Dumps

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The most realistic description of energy flow through an ecosystem is a food web that represents an interconnected series of food chains. In general, the greater the number of alternative channels through which energy can flow, the greater the stability of the food web and the ecosystem.

The diagram shows a typical food web for a wet meadow. The hawk and the fox obtain nourishment by preying upon rabbits, frogs, snakes, and mice. The fox may even eat grasshoppers. If, for example, the rabbit population is reduced, possibly because of bad weather during the breeding season, the fox and hawk would shift their predatory pressure to other forms of prey. The rabbit population would then have a chance to bounce back and the ecosystem would remain stable.

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Based on the diagram, which consumer would have the greatest chance of surviving if the amount of available prey changes during the different seasons?

Wheat is the staple cereal for most of the world. Flour is made from the kernel of the wheat plant. The kernels are first separated from the plant stem and then broken apart by the milling process. The husk, the outer layer unusable for most purposes, is removed.

The wheat kernel (whole grain) has three main parts: germ, bran, and endosperm. The germ is especially rich in vitamin E, niacin, and riboflavin. The bran, a protective coating around the kernel, is also a rich source of nutrients and fiber. The endosperm, making up 83% of the kernel, is the soft inside portion containing starch and proteins.

Although the enrichment of white flour restores some of the lost nutrients, there are some vitamins and minerals that are lost in the refining process and not replaced. A valuable source of fiber is also lost.

Ling reads an article that states that many people don’t get enough fiber in their daily diet.

Which type of bread would be the best to recommend to Ling?

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Since carbon dioxide dissolves in water to form an acid, an acid-base indicator such as bromthymol blue is used to track the acid concentration during plant photosynthesis and respiration. Bromthymol blue turns yellow in an acid solution and remains blue in a basic solution. The color change is reversible. A student used the following procedure to track carbon dioxide.

In an experiment, a student placed a solution of bromthymol blue into each of two flasks, inserted a drinking straw in each flask, and blew through the straw until the solution turned fromblue to yellow. Carbon dioxide, a waste product in the student’s breath, caused the color change. The student then placed a small Elodea water plant in each flask and closed the flasks with rubber stoppers. Flask A was placed in bright sunlight, while flask B was placed in the dark for 24 hours, as shown in the figure below.

After 24 hours, the bromthymol blue in flask A had turned back to blue, while in flask B it was still yellow.

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The experiment was designed to track what substance?