51. Plants do not have a circulatory system like that of some animals. plant to

Question

51. Plants do not have a circulatory system like that of some animals. plant to another a given water molecule did 'circulate hat is, go from one point in a and back, it would require the activity of A. only the xylem B. only the phloem C. only the endodermis D. both the xylem and endodermis E. both the em and phloem. 52 Which of the following statements about hormones is incorrect? A They are produced by endocrine glands molecules B They are modified amino acids, peptides, or steroid C They are carried by the circulatory system D They are used to communicate between different organisms E They elicit specific biological responses from target cells 53.The endocrine system and the nervous system are structurally related. Which of the following cells best illustrates this relationship? A neuron in the spinal cord B a steroid-producing cell in the adrenal cortex. CA neurosecretory cell in the hypothalamus D A brain cell in the cerebral cortex E A cell in the pancreas that produces digestive enzymes 54. Guard cells do which of the following? A. Protect the en is B. Accumulate K+ directly into cells C. Contain chloroplasts that import K+ directly into cells D. Guard against mineral loss through the stomata E.Help balance the photosynthesis-transpiration compromise

Explanation / Answer

1 Ans E

E) both the xylem and the phloem.

Plants have a transport system, in some ways similar to an animal's blood circulatory system. In plants both xylem and phloem together make up the transportation in Plants. Xylem vessels carry water and minerals on into the plant, but only in an upward direction. To transport back it needs phloem the direction of this movement can be either upwards or downwards from the leaves.

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