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Fototropismo ou fototaxia é a proposito da designação dada ao movimento de certos dos seres vivos em reação a estímulos luminosos, especialmente dos seres vivos tais como as plantas, com destaque para o girassol; que em resposta a estímulos luminosos que poderão ser de frente para a fonte de luz solar (fototaxia positiva), e em sentido oposto a ...
In biology, phototropism is the growth of an organism in response to a light stimulus. Phototropism is most often observed in plants , but can also occur in other organisms such as fungi . The cells on the plant that are farthest from the light contain a hormone called auxin that reacts when phototropism occurs.
Phototroph. Phototrophs (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light', and τροφή (trophḗ) 'nourishment') are organisms that carry out photon capture to produce complex organic compounds (e.g. carbohydrates) and acquire energy. They use the energy from light to carry out various cellular metabolic processes.
Phototropins are blue light photoreceptor proteins (more specifically, flavoproteins) that mediate phototropism responses across many species of algae, fungi and higher plants. Phototropins can be found throughout the leaves of a plant.
Photoperiodism is the physiological reaction of organisms to the length of light or a dark period. It occurs in plants and animals. Plant photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods.
Tropisms are usually named for the stimulus involved; for example, a phototropism is a movement to the light source, and an anemotropism is the response and adaptation of plants to the wind. Tropisms occur in three sequential steps. First, there is a sensation to a stimulus. Next, signal transduction occurs.
Fototropismo é uma resposta direcional que permite às plantas crescerem em direção, ou, em alguns casos, na direção oposta, a uma fonte de luz.
