Plants do not have a circulatory system like that of some animals. If a given wa
ID: 180402 • Letter: P
Question
Plants do not have a circulatory system like that of some animals. If a given water molecule did 'circulate (that is, go from one point in a plant to another and back), it would require the activity of only the xylem only the phloem only the endodermis degree both the xylem and endodermis both the xylem and phloem. Which of the following statements about hormones is incorrect? They are produced by endocrine glands They are modified amino acids, peptides, or steroid molecules They are carried by the circulatory system They are used to communicate between different organisms They elicit specific biological responses from target cells The endocrine system and the nervous system are structurally related. Which of the following cells best illustrates this relationship? neuron in the spinal cord a steroid-producing cell in the adrenal cortex. A neurosecretory cell in the hypothalamus A brain cell in the cerebral cortex A cell in the pancreas that produces digestive enzymes Guard cells do which of the following? Protect the endodermis Accumulate K+ directly into cells Contain chloroplasts that import K+ directly into cells Guard against mineral loss through the stomata Help balance the photosynthesis-transpiration compromiseExplanation / Answer
51 . E both xylem and phloem will be required as xylemis unidirectional whereas phloem is bidirectional.
52 . B option
As hormones cannot be modified as such
53. C
A neurosecretory cell which is neurologically active as well as prepares stimulating and inhibitory hormones for other glands.
54. E
Guard cells guard stomatas and prevent excessive water loss thus creating a balance between both proceses