plant hormones and responses, lab report

plant hormones and responses, lab report - [Type text]...

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[Type text] Plant Hormones and Responses Plant hormones are chemical messengers produced in one part of the plant which has a target elsewhere in the plant. They play a crucial role in controlling the way in which plants grow and develop. Surrounding environmental conditions influences the way hormones may affect the life cycle of a plant. Hormones shape the plant by affecting seed growth, time of flowering, the sex of flowers, its longevity, as well as senescence of leaves and fruits. In addition, they also affect which tissues grow up and which grow downward, leaf formation and stem growth, fruit development and ripening, and even plant death. Hormones are vital to plant growth and lacking those plants would be mostly a mass of undifferentiated cells. Three experiments were conducted in this lab: Plant Tropisms, The Role of Auxin in Apical Dominance, and The Effect of Light on Germination. A tropism is a directional movement in response to an external stimulus. A tropism is positive if the plant grows toward the direction of the stimulus; when the plant grows away from the direction of the stimulus, the tropism is negative. In Lab A, “Plant Tropisms”, we were instructed to observe two tropisms elicited from both light (phototropism), and gravity (geotropism). I hypothesized that the tropisms observed in both of the plants will be positive, and predicted that that the plant roots would grow downwards in the direction of gravity and the stems would grow upwards towards the light. Auxin is one of the five plant hormones and is produced in the shoot apex, as well as in long leaves. It maintains apical dominance by stimulating meristematic growth (stem elongation) and inhibiting growth of lateral buds. Apical dominance is the inhibiting effect of a terminal bud upon axillary bud development. In Lab B, The Role of Auxin in Apical Dominance, we investigated the role of auxin in axillary bud development in a plant that
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[Type text] normally exhibits strong apical dominance. Because auxin stimulates stem elongation, I hypothesized that the plants treated with auxin would have an increase in stem height as compared to others. I predicted that the plants treated with auxin and lanolin would have the
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This lab report was uploaded on 02/05/2008 for the course BISC 120 taught by Professor Webb,wetzer,? during the Fall '07 term at USC.

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plant hormones and responses, lab report - [Type text]...

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