offers hundreds of practice questions and video explanations. Go there now.

Sign up or log in to Magoosh GRE Prep.

Reading Comprehension Practice Question of the Week #26

Here’s this week’s practice question for a thrilling passage about fish coloration– put Chris’s science passage tips to use! We’ll be posting the answer tomorrow, good luck!

Protective coloration is common among animals. Some animals are countershaded for camouflage. For example, the next time you pass a fish market, look at the specimens laid out for viewing. Fish are nearly always darker on top than on the bottom. The selective theory of camouflage has long been favored by some ichthyologists, who believed that countershading reduces the contrast between the shaded and unshaded areas of the body when the sun is shining on the fish from overhead and lessens its vulnerability to predators. However, the discovery that the Nile catfish is reverse-countershaded—that is, its dorsal (upper) surface is light and its ventral (lower) surface is dark—turned this theory on its head.

However, enterprising ichthyologists saved the selective theory of camouflage by observing that the Nile catfish swims upside down, primarily to feed from the surface of the water. Some ichthyologists speculate that the Nile catfish also swims upside down for protection.

The passage provides information on each of the following EXCEPT:

  1. etiology of countershading
  2. etiology of reverse-countershading
  3. feeding habits of countershaded fish
  4. selective theory of camouflage
  5. protective coloration of animals
Update: Here’s the answer/explanation post!

Magoosh students score 12 points better than average on the GRE. Click here to  learn more!

Most Popular Resources

2 Responses to Reading Comprehension Practice Question of the Week #26

  1. Sneha April 23, 2012 at 3:22 am #


  2. marzu November 22, 2011 at 6:45 am #


Magoosh blog comment policy: To create the best experience for our readers, we will only approve comments that are relevant to the article, general enough to be helpful to other students, concise, and well-written! 😄 Due to the high volume of comments across all of our blogs, we cannot promise that all comments will receive responses from our instructors.

We highly encourage students to help each other out and respond to other students' comments if you can!

If you are a Premium Magoosh student and would like more personalized service from our instructors, you can use the Help tab on the Magoosh dashboard. Thanks!