Explain how allelopathic substances and secreted antibiotics can reduce competitors in an organism's environment.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2025–2026.
(i) Identify the overall relationship between extract concentration and root length. (ii) Compare and contrast the effects on shoot height and above-ground biomass. (iii) Calculate the percentage change in total biomass from control to 12 mg mL⁻¹.
Discuss whether these results support the hypothesis that chemical effects on other plants or on soil microbes help an invasive plant establish.
A cover crop releases compounds that suppress germination of nearby plants. What agricultural use could follow from this allelopathic effect? A. Replacing all mineral nutrients with the released compounds B. Developing a treatment that reduces weed…
A model plant releases a compound that suppresses germination of neighbouring species. Which term describes this chemical effect on competitors? A. Allelopathy B. Intraspecific courtship C. Mutualistic pollination D. Pathogenic infection by a virus
A soil fungus releases an antibiotic into its surroundings. What ecological benefit can this give the fungus? A. It creates additional sunlight beneath the soil B. It suppresses competing microbes that use the same resources C. It guarantees that every…
Black walnut roots release compounds that suppress growth of nearby susceptible plants. What is this interaction called? A. Mutualism B. Allelopathy C. Migration D. Pollination
Roots of one plant release a compound that suppresses the growth of neighbouring plants of another species. What is this chemical interaction called? A. Allelopathy B. Cooperative hunting C. Obligate mutualism D. Parasitic ingestion
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