How are hormone levels A. An endocrine gland can respond to the blood level of h

Question

How are hormone levels A. An endocrine gland can respond to the blood level of hormone it produces. B. A hormone can trigger a second gland to secrete a hormone that dampens production of the first hommone. C. A second contrary hormone can counteract the effect of the first hormone. D. A product can trigger hormone production; the homone can then reduce the amount of product which in turn reduces the level of hormone. E. All of the above regulate hormone levels. of these external stimuli produces a growth of the plant toward light? Which 24. A. negative gravitropism B. positive gravitropism C. thigmotropism D. negative phototropism E. positive phototropism Transpiration in plants requires all of the following except A) adhesion of water molecules to cellulose. B) cohesion between water molecules. C) evaporation of water molecules. D) active transport through xylem cells. E) transport through tracheids. 26 An example of an environmental signal that acts at a distance between individuals is A. insulin. B. cortisol. prostaglandins. E. nerve growth factor, 27. All of the following animal groups include terrestrial life forms except A Mollusca B. Crustacea C. Echinodermata D Arthropoda E. Annelida

Explanation / Answer

23 . E all of the above can regulate hormone levels.

24. E positive phototropism as the name suggests photo means light,tropy means movement, positive means towards

25. A . Adhesion of water molecules to cellulose will decrease transpiration

26. C . Pheromones

Usually used for mating eg dogs

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