How many hormone levels regulated? An endocrine gland can respond to the blood l

Question

How many hormone levels regulated? An endocrine gland can respond to the blood level of hormone it produces. A hormone can trigger a second gland to secrete a hormone that produces of the first hormone. A secondary contrary hormone can contract the effect of the first harmonic. A product can trigger hormone production, the hormone can then reduce the amount of product which in turn reduces the level of hormone. Which of these external stimuli produces a growth of the plant toward light? negative gravitropism positive gravitropism thigmotropism negative phototropism positive phototroplsm Transpiration in plants requires all of the following except adhesion of water molecules to cellulose. cohesion between water molecules. evaporation of water molecules. active transport through xylem cells. transport through tracheids. An example of an environmental signal that acts at a distance between inside. insulin. cortisol. pheromones. prostaglandins. nerve growth factor. All of the following animal groups include terrestrial life forms Mollusca Crustacea Echinodermata Arthropoda Annelida

Explanation / Answer

23) E. All of the above.

24) E. Positive phototropism.

Positive phototropism is the type of plant movement towards the source of light.

25. D.Active transport through xylem vessels.

26. C. Pheromones.

Pheromones a chemical substances released by one organism that influences the physiology of other organisms.

27) C. Echinoderms take.

Echinoderms are exclusively marine animals found in sea water.

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