53. Lipids are important for all of the following except a. reducing the permeab

Question

53. Lipids are important for all of the following except a. reducing the permeability of the integument to water. b. storing water. d. serving as hormones (for example, steroid lipids). 54. Suspension feeding is more common in aquatic environments than in terrestrial environments because a. terrestrial vertebrates are too large to suspension feed. b. terrestrial animals are too selective in their feeding to be suspension feeders. c. terrestrial animals typically feed lower on the food chain than aquatic animals do. d. small suspended food items are abundant in aquatic systems but not in terrestrial systems. 55. A major difference between vertebrate and insect digestive systems is that a. only vertebrates have a foregut. b. gut motility is a characteristic of vertebrates only. c. the hindgut affects urine composition in insects but not in vertebrates

Explanation / Answer

53) Lipids are not involved in storing water. The higher lipid content is related to the lower water permeability. In cellular membrane, lipids are involved in the formation of lipid bilayer. Sterols (a subgroup of steroid), they are amphipathiclipids derived from acetyl-CoA.

54) (d) Most of the sunlight falling on earth falls on ocean. So there are so many microscopic plants on the surface of the ocean that carry out photosynthesis. These microscopic plants (phytoplanktons) are food for other animals. There is no suspended food items are present in terrestrial system.

55) (c) In the hind gut of the digestive system of insects, the absorption of water, salts and other beneficial substances take place before excretion. In case of human, the excretion is totally independent of digestive system.

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