8. A. 30 Neuromast 32. Taste bad E. C. Multiple Choice 34. The tapetum lucidum (

Question

8. A. 30 Neuromast 32. Taste bad E. C. Multiple Choice 34. The tapetum lucidum (found in the eyes of many fishes) is a (an a heavily pigmented anterior continuation of the choroid layer just internal to the cornea b. layer of photoreceptor cells lining interior surface of back of eye, which is continuous with optic nerve inidescent, reflecting layer (containing guanine crystals) that increases visual sensitivity of retinal by reflecting light back through the retina and enhances night vision d. light-sensitive layer of photoreceptor cells located on the dorsal surface of the brain e. all of the above 35. Electric organs (which produce electricity) are present in Torpediniformes (electric rays) and Gymnotiformes (knifefishes, electric eel). These organs are also found in ormes b. Siluriformes (electric catfishes) c. Perciformes (stargazers) d. Rajiformes (skates) e. all of the above 6 l lose substantial amounts of water via osmosis across the gill epithelia; these fishes usually have smaller and fewer glomeruli (lacking in some species), which prevents excessive extrarenal water losses. a- freshwater bony fishes b. freshwater lampreys c freshwater hagfishes d. marine bony fishes e. all of the above

Explanation / Answer

34. The tapetum lucidum is an eye tissue layer capable of reflecting the visible light back through the retina and further enhancing the night vision. Hence the answer will be (c)

35. Electric organs are present in all the mentioned fishes. Hence the answer will be (e) all of the above.

36. The salt water fish lose water via osmosis, while the fresh water fish gain water via osmosis. Hence, the answer will be (d) marine bony fishes.

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