Edexcel IGCSE Biology 2.84 Tropic Responses Questions
Phototropism and geotropism describe directional growth. See how roots and stems respond to light and gravity, and how auxin changes growth.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- Define a tropic response and compare positive or negative phototropism and geotropism in roots and stems.
- Explain plant growth patterns using auxin distribution and differential growth in response to light or gravity.
- Explain how root and stem tropisms support photosynthesis, anchorage, and water or mineral uptake.
- Describe how to modify a plant experiment to investigate the effect of gravity on roots.
Edexcel IGCSE Biology 2.84 Tropic Responses Questions question 1
[Maximum number: 4]
The body has a hormonal control system that coordinates some of the body's responses.
Plants also respond to changes in their environment.
Explain how plants benefit from the responses of their roots and stems to the direction of light they receive.
An explanation makes reference to four of the following points:
1. stems (grow) towards light / positively phototropic / eq
2. (increase) photosynthesis / eq
3. away from competition / other plants / eq
4. roots (grow) away from light / negatively phototropic /eq
5. into soil / to absorb water / minerals / named mineral / for water / for minerals / for named mineral /eq
6. to anchor plant / eq
leaves (face sun)
plants
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