A student investigates phototropism in wheat seedlings. She cuts the tips off some of her seedlings. She leaves the seedlings in the window. Two days later the seedlings have bent towards the light. Describe and explain these findings.
removing tips removes auxin so growth stopsauxin collects on the shaded sideauxin causes cell elongation on the shaded sideelongation on one side causes shoot to bend to the other sidethis is positive phototropismthis is advantageous for the plant as light is required for growth
AA
Related Biology GCSE answers
All answers ▸TMV (tobacco mosaic virus) can cause plants to produce less chlorophyll. This causes leaf discoloration. Explain why plants with TMV have stunted growth.
Temperature affects cell membrane permeability. At high temperatures, proteins that support and maintain cell membranes may be denatured, increasing membrane permeability.How may membrane permeability change at low temperatures?
What are the non-specific defence systems of the human body that protect it from pathogens?
Why might a person with coeliac disease have poor growth?