A) basipetal
B) acropetal
C) both [a] and [b]
D) centripetal
Correct Answer: C
Solution :
Auxins are weakly acidic growth hormones having an unsaturated ring structure and capable of promoting cell elongation, especially of shoots. Darwin and his son found that bending movement of coleoptile of canary grass (Phalaris canariensis) was due to exposure of tip to unilateral light. Auxin was first collected by Went (1928) -from coleoptile tip of Avena. Natural auxins are synthesized in physiologically active parts of plants such as shoot apices etc. The movement of auxins is basipetal in stem ie, from apex to base and acropetal in roots ie, from tip towards shoot. This type of movement is called polar movement.
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