A plant is exposed to far-red light immediately after a brief pulse of red light. Which statement is true regarding phytochrome and seed germination (in a positively photoblastic seed)? A) Germination is promoted because Pfr levels increase B) Germination is inhibited because Pfr is converted to Pr C) Germination is unaffected because the effect of red light is irreversible D) Germination occurs only if the far-red exposure is longer than 1 hour
Official past papers for Singapore-specific rounds (SBO/SJBO) are generally not released publicly in a centralized, downloadable archive due to non-disclosure agreements signed by invigilators. However, you can find representative materials here: singapore biology olympiad past papers
Access the official IBO Examination Papers Archive for theory and practical papers. A plant is exposed to far-red light immediately