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Plant Section Study Questions

Plant Section Study Questions - from the pith tissue When...

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Plant Section Study Questions Topic: Pith, Cytokinins Questions 1. Name the four major effects of cytokinins on plants. 2. Explain how relative concentrations of auxin and cytokinins affect organ differentiation in tissue cultures of plants. 3. What is the effect of cytokinin on apical dominance? What happens when cytokinin is placed on an axillary bud? 4. Where is pith tissue found? How was pith tissue used to discover cytokinins? Answers 1. Cytokinins stimulate cell division, retard aging of the plant, promote organ differentiation when combined with auxin, and causes the plant to overcome apical dominance. 2. When there are high auxin concentrations and low cytokinin concentrations, roots form
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Unformatted text preview: from the pith tissue. When there are low auxin concentrations and high cytokinin concentrations, shoots form. When there are relatively equal concentrations of auxin and cytokinin, the tissue remains undifferentiated (also known as callus tissue). 3. Cytokinin causes the plant to overcome apical dominance, allowing branching from axillary buds to occur. When cytokinin is placed on an axillary bud, the bud is no longer inhibited by auxin from the apical meristem and begins to grow. 4. Pith tissue is parenchyma cells found inside the stem. Pith tissue was placed in flasks with extracts of plants to determine the cause of cell division regulators in plants....
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