Explain positive phototropism as directional growth in response to light arriving from one side.
Tę umiejętność sprawdzają 4 zadania wzorowane na arkuszach IB z lat 2024–2026.
Two upright oat coleoptiles receive light from the left. A thin impermeable insert is placed just below the tip on opposite sides of P and Q. The diagram records their appearance before and after exposure. (i) Identify the directional response of Q. (ii)…
Outline the response of a young shoot when illumination comes mainly from its left side.
A young shoot bends towards a light source on its left. Which auxin distribution contributes to that response? A. More auxin on the illuminated left side, producing faster growth there B. Equal auxin on both sides, with identical elongation C. More auxin on…
(a) Describe how auxin produces a shoot’s directional growth response to light. (b) Outline feedback interactions among hormones controlling ovarian and uterine cycles. (c) Explain how the loop of Henle and ADH influence urine concentration.
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