An aphid is an insect that has mouthparts to sip plant sap.When placed on an herbaceous stem,it soon has its mouthparts embedded and is withdrawing plant sap.Sometimes so much plant sap is taken that it cannot use all of it and the aphid secretes droplets of the sugar to attract ants that in turn protect and care for the aphids.What layer of cells has the aphid's mouthparts tapped?
A) xylem
B) phloem
C) parenchyma
D) trichomes
E) collenchyma
Correct Answer:
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Q22: The waxy material known as the Casparian
Q30: Monocots differ from eudicots in that monocots
Q30: Which association is incorrect?
A)vessel element--xylem
B)guard cells--epidermis
C)parenchyma--ground tissue
D)sieve-tube
Q31: Your task in laboratory is to find
Q31: The fibers that get stuck between your
Q32: Which of these associations is incorrect?
A)epidermal cell--protection
B)stomata--gas
Q33: Which of the following statements is not
Q35: Xylem tissue contains
A) vessel elements and tracheids.
B)
Q36: Which of the following is a monocot?
A)
Q40: Root hairs are found in which area
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