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- List 3 environmental factors discussed in lectures and give examples of physiological and biochemical perturbations in plants caused by fluctuations in these environmental factors. For each of the 3 environmental factors describe the primary effects and the secondary effects.Discuss other morphological differences between sunny and shady set-ups of mung bean in relation to phototropic response of plants. Characteristics sunny shaded Leaf color Lime Green Pale Green Direction of Growth Grows upward towards the direction of sunlight Oriented in the direction of the light but growth is bent downwardHormones and signal pathways Complete the following paragraph to describe signal transduction as it occurs within plants. Choices may be used more than once or not at all. Chemical signals called play an important role in a plant's ability to respond to a stimulus. These signals bind to receptors, the first step in a cellular response called a may be located in the plasma membrane, the cytoplasm, the nucleus, or the endoplasmic reticulum. The series of relay proteins or enzymes activated by the hormone binding the receptor make up the Some responses are immediate, while others require a like Ca*, to initiate a cellular response. The result of the transduction pathway is a which is often the transcription of specific genes, resulting in some measurable change. hormones reflex arc signal transduction pathway Signal transducers second messenger response Receptor proteins first messenger
- Discuss early events in the sensing of abiotic stress by plants and the acclimation pathways activated by the events. Focus on membrane stability and integrity, protein/DNA structure, enzyme activity and signalling.Almost all plant communication is by a slow mechanism. What is the mechanism?Watch the suggested videos for Plants Response to Stimuli. a. GeotropismGeotropism Experiment (2:48 minutes)https://www.youtube.com/watch?v=AEo5UsPeB5gb. PhototropismPhototropism Experiment (2:16 minutes)https://www.youtube.com/watch?v=WZ1NRP3OF5w a. For each experimental set up (geotropism and phototropism), identify the dependent and independent variables that have contributed to how plants responded to the stimuli.
- The hormone abscisic acid provides advantages to plants in stress conditions by Select one: inhibiting the growth of nearby plants and so reducing competition attracting beneficial predatory insects increasing tolerance to environmental stressPredict whether flowering in a short day plant with a minimum critical length of 14 hours would be expected to occur in the following situations. The plant is exposed to 15 hours of daylight and 9 hours of darkness uninterrupted. The plant is exposed to 9 hours of daylight and 15 hours of darkness. The plant is exposed to 9 hours of daylight and 15 hours of darkness, with 10 minutes exposure to red light in the middle of the night.Plants provide a wide range of benefits to both the ecosystems in which they live, as well as to humans. Identify and describe 1) a benefit to the ecosystem, and 2) a benefit to humans specifically (1-2 sentence per function). Be sure to include information regarding why these functions are important or what impact they have.
- The summer is not optimal for grape growing and you're searching in your memory for something regarding plant hormones. Explain 2 ways you could utilize plant hormones (choose from auxin, ethylene, cytokinin, gibberellin, abscisic acid, salicylic acid, jasonic acid) to compensate for a problem during growing. For each way:Describe in detail each step in a general plant signal transduction pathway.Differentiate the saturation concept from the limiting factor concept of plant response to the environment.