4. A student investigated the effect of plant growth substances (IAA and GA) on the elongation of peastems, the students marked a 10mm length of stem on each of four plants and applied growthsubstances to the stem. Figure 2 shows a graph of the student's results.Length of stemsection (mm)16114-12-10+0Describeb)c) Suggest a suite10************20 30Time (h)40IAA and GAIAAGAcontrol5060minem & wth of the cocrease in length of 4.9mm. The movimeafter application of growth substances was 4.2min. Calculate the percentage mereas(2)treatment for the control (2d) Suggest how the student could have improved their investigation (5)sepere***********************

IAA is a naturally occurring plant hormone that is related to the class of phytohormone auxin.…

4. A student investigated the effect of plant growth substances (IAA and GA) on the elongation of pea stems, the students marked a 10mm length of stem on each of four plants and applied growth substances to the stem. Figure 2 shows a graph of the student's results. Length of stem section (mm) 161 14- 12- 10+ 0 Describe 10 20 30 Time (h) 40 growin IAA and GA IAA GA control 50 60 sepere **********

4. A student investigated the effect of plant growth substances (IAA and GA) on the elongation of pea stems, the students marked a 10mm length of stem on each of four plants and applied growth substances to the stem. Figure 2 shows a graph of the student's results. Length of stem section (mm) 161 14- 12- 10+ 0 Describe 10 20 30 Time (h) 40 growin IAA and GA IAA GA control 50 60 sepere **********

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter37: Plant Signals And Responses To The Environment

Section: Chapter Questions

Problem 13TYK

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7. a)Tea plants contain several chemical compounds, including tannins and caffeine. What function do both tannins and caffeine perform for tea leaves? b)By what process does water enter the root cells of a plant? c)The blade of the leaf is attached to the stem by a stoma. Is this true or false?
1.Do you think Bangladesh is capable of doing transgenic crop research? Write your thoughts in details. 2. Write your opinion with examples on the following statement, "Plant regeneration is the response to the plant growth hormone"
4. Plant roots are positively gravitropic; what does this mean? a. They are positively attracted to soil. b. They grow toward the direction of gravity. c. They grow away from other plant roots. d. They grow in the opposite direction to sunlight. 5. Plant shoots are positively phototropic; what does this mean? a. They grow toward a light stimulus. b. They grow toward other brightly colored plants. c. They grow away from bright sunlight. d. They reflect the majority of the wavelengths of light. 6. Which of the following is correct about plant roots? a. Plant roots are positively phototropic and negatively gravitropic. b. Plant roots are negatively phototropic and positively gravitropic. c. Plant roots are positively hydrotropic and negatively gravitropic. d. Plant roots do not display any major tropisms.
From a developmental standpoint, a seed is best described as a(an): a. epicotyl. b. endosperm. c. ovary. d. mature spore. e. mature ovule.
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15. The sticky cinquefoil (Potentilla glandulosa) is a small, deciduous plant with bright yellow flowers that lives throughout the American West, and its leaf phenotype can vary depending on environmental conditions. Inland, where there are dramatic seasonal temperature swings and unpredictable droughts, plants shed their large “summer leaves” in autumn when the temperature begins to drop. In the spring new leaves are smaller and develop in a compact rosette. This phenotype persists for several months and is thought to be an adaptation that makes the plants drought-resistant (because less water evaporates from reduced leaf surfaces). By contrast, the leaves of P. glandulosa plants growing in a coastal climate are always large. In their habitat, seasonal temperature swings are not as great and the annual cycle of winter rain and summer drought is highly predictable. Suppose you decide to explore the hypothesis that the coastal population is genetically capable of exhibiting the same seasonal shift in leaf morphology as the inland plants. Would you need access to a greenhouse where you can control variables, or would it be just as easy to do experiments in the wild? Explain your reasoning and outline your experimental design—including the variable or variables you will test in the first experiment.
What are the two alternating generations of plants?
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4. Define transpiration and give some of its significance 5. How do root hairs absorb water? 6. A plant hormone was first discovered in Japan when rice plants were suffering from Bakanae disease caused by Gibberella fujikoroi. Based on this information answer the following questions: a. Identify the hormone involved in this process. b. Which property of this hormone causes the disease? 7. Name the gaseous plant hormone and describe three different actions of this hormone in plants. 8. Explain how the auxin:cytokinin ratio affects plant growth.
39 You are growing tomatoes and your plants are healthy and nearly one metre tall. Youworry that they might get blown over by the wind, so you decide to lend them extrasupport with a wire frame. You accidently break the growing tip off the top of one ofthe plants. After a few weeks, you notice that instead of growing tall like the otherplants, the plant with the broken tip has grown denser with thicker lateral shootsthan the other plants.Answer the following questions in sentence format, that are related to the abovecase study. bc) What three plant hormones (plant growth regulators) and signaling moleculeare involved? And What hormone could you apply to the cut tip to reduce lateral shootdevelopment?
11.a) The roots of legumes, such as peas and beans, have special nodules that are home to large numbers of bacteria. What benefit do these bacteria provide to the plant? What do they receive inexchange? b)Virtually all plant species have some way of protecting themselves against herbivores. Yet there exist many thriving species of herbivores across the globe. Demonstrate how these two realities can coexist. c)Compare and contrast the two types of root systems. Describe the characteristics of each.