15. Plant stems respond by bending toward a light source as a result of: a. cell
ID: 210160 • Letter: 1
Question
15. Plant stems respond by bending toward a light source as a result of: a. cells on the side of the stem away from the light source dividing more rapidly b. cells in the stem closest to the light source dying off and being replaced by cells from the other c. cells on the side of the stem toward the light source shortening. side of the stem. d. cells on the side of the stem away from the light source lengthening. 1. The primary reason for why a relatively longer (relative to body size) loop of Henle can help an animal adapted to arid climates is that: a. not as much ATP needs to be utilized as in the nephrons/kidneys of animals with shorterI of Henle. b. the proximal tubule does not have to work as hard when fluid enters it from the Bowman's capsule. the animal is able to drink more liquid water without ill side effects. d. a long loop of Henle results in the production of highly concentrated urine that requires very little water to excrete. 7. In a woody plant species, the primary effect of the vascular cambium is to: a. produce cells only to the outside of the cambium and thereby produce bark. b. differentiate into apical cambium which allows the plant to lengthen stems and roots. c. produce additional nodes so that the plant can increase node-internode distances. d. produce wood and increase the diameter of stems, roots, and branches.Explanation / Answer
16. Plants bend towards a light source as a result of cells on the side of the stem away from the light source lengthening. The higher concentration of auxin on the shady side causes the plant cells on that side to grow more so it bends toward the light.
17. In arid conditions, a long loop of Henle results in the production of highly concentrated urine that requires very little water to excrete. Example: kangaroo rat and other rodents in the desert.
18. In woody plants, the primary effect of vascular cambium is to produce cells only to the outside of the cambium and thereby produce bark.
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