CourseCourseConceptConceptDocumentDocument

Edexcel IGCSE Biology 2.83 Plant Responses to Stimuli Questions

Plants respond to environmental cues: daylight can time flowering, while water stress can trigger ABA responses that reduce water loss.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • Explain why daylight duration can be a more reliable seasonal cue for flowering than temperature.
  • Use both graphs to compare changes in leaf ABA concentration and relative water loss before and after watering.

Edexcel IGCSE Biology 2.83 Plant Responses to Stimuli Questions question 1

[Maximum number: 2]

The body has a hormonal control system that coordinates some of the body's responses.

Plants also respond to changes in their environment.

In many plants, flowering is stimulated by the number of hours of daylight.

Suggest why flowering in many plants is stimulated by the number of hours of daylight rather than by temperature.

All question bank results loaded