複選題26. According to modern ideas about phototropism in plants (A) light causes auxin to accumulate on the shaded side of a plant stem. (B) auxin stimulates elongation of plant stem cells. (C) auxin is produced by the tip of the coleoptile and moves downward (D) A, B and C

2. Genetically engineered plants (A) are more difficult to engineer than animals. (B) include a transgenic rice plant that can help prevent are more difficult to engineer than animals t vitamin A deficiency. (C) are being rapidly developed, but traditional plant breeding programs are still the only method used to develop new plants. (D) are able to fix nitrogen themselves

複選題
26. According to modern ideas about phototropism in plants
(A) light causes auxin to accumulate on the shaded side of a plant stem.
(B) auxin stimulates elongation of plant stem cells.
(C) auxin is produced by the tip of the coleoptile and moves downward
(D) A, B and C

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