![]() It is interesting to note that plants can also track the path of the sun as it moves across the sky from East to West during This process is called phototropism,Īnd it means that the plant’s photosynthesizing cells can access more light to absorb and increase the rate of photosynthesis. Leaves, and even flowers, are often seen growing toward light, as you can see in Figure 2. Therefore, it is essential that plants are in the presence of light in order to survive and grow. Though they can storeĮnergy in the form of starch for short periods of time, photosynthesis is the only way in which most plants are able to obtainįood. Plants can then use this glucose in cellular respiration where it is broken down to release energy. Glucose, which is effectively the plant’s self-made food source. ![]() It is the process by which plantsĬonvert light energy, usually from the sun, into chemical energy within their cells. The word photosynthesis literally means making substances using light. You probably heard the word “photo” in several words referring to plants before, suchĪs photosynthesis. “Photo” means light, and phototropisms are growth responses of a plant These are directional plant responses to light, water, and gravity respectively.įigure 2: A diagram demonstrating a plant’s growth response to light: phototropism. The main tropisms that we will be investigating in this explainer are phototropism, hydrotropism, and geotropism, which is Our best definition is therefore option D, tropism is the response of a plant to grow toward or away from a stimulus. Tropisms may actually cause a change inĭirection of growth by inhibiting elongation of cells. ![]() Of cells growing longer, or elongating, but this is not always the case. A tropism is aĭirectional growth response to a stimulus, for example to light, water, or gravity. Unlike animals, plants do not have a nervous system that allows them to respond to these conditions. Plants and animals both respond to their external environments in order to access the best conditions they are able to. They are not easy, as more than one answer may technically be correct. Although they are multiple-choice questions, Take care with questions asking for the “best” definition. Tropism is the response of a plant to grow toward or away from a stimulus.Tropism is the mechanism by which a plant increases its cell division and growth. ![]() Tropism is the movement of a plant toward a.Tropism is the response of a plant to external stimuli via its nervous system.Which of the following best defines tropism? ![]()
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