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Phototropism. Phototropism is a plant's growth response to light. Plants need light to grow. Usually, plant shoots and stems exhibit a positive reaction to light (they grow towards the light source). The ability to grow towards sunlight gives the plants an evolutionary advantage.tudies have shown that plant hormones of the class of auxins play a key role in this directed growth process. Auxin is released into the cells on the plants shady side. There, the hormone stimulates the cell walls to elongate. Also, growth is inhibited on the plant's sunny side.
Photorespiration is a problem for plants in hot, dry conditions. When it is hot and dry, plants close their stomata to conserve water. As a result, oxygen from the light-dependent reactions accumulates in leaf tissues.Oxygen competes with carbon dioxide for the binding site on rubisco.Photorespiration occurs when oxygen levels in the leaf are high relative to carbon dioxide levels.Some groups of plants have adapted to these conditions by using alternative pathways to fix carbon. C4and CAM plants avoid photorespiration in different ways. C4plants use spatial separation.hotorespiration occurs when oxygen levels in the leaf are high relative to carbon dioxide levels. Some groups of plants have adapted to these conditions by using alternative pathways to fix carbon. C4and CAM plants avoid photorespiration in different ways. C4plants use spatial separation.