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Heliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers or leaves) in response to the direction of the Sun. The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning "sun turn".
The light from the lamp (1.) functions as a detectable change in the plant's environment. As a result, the plant exhibits a reaction of phototropism--directional growth (2.) toward the light stimulus. Auxin distribution controls phototropism. 1. Sunlight strikes the plant from directly above. Auxin (pink dots) encourages growth straight up. 2 ...
The -lemma, sunflower lemma, and the Erdős-Rado sunflower conjecture give successively weaker conditions which would imply the existence of a large sunflower in a given collection, with the latter being one of the most famous open problems of extremal combinatorics.
Northrop Frye believed that the "merging of imagination and time is the axis on which all Blake's thought turns." [11] "Ah! Sun-flower" (with its constrictions of space-time and its hint at creative, energetic imagination as a potential way out) seems to be an example of this dialectic, as the various responses of critics outlined below show.
Plant perception is the ability of plants to sense and respond to the environment by adjusting their morphology and physiology. [1] Botanical research has revealed that plants are capable of reacting to a broad range of stimuli, including chemicals, gravity, light, moisture, infections, temperature, oxygen and carbon dioxide concentrations, parasite infestation, disease, physical disruption ...
The BBCH-scale (sunflower) identifies the phenological development stages of the sunflower (Helianthus annuus). It is a plant species specific version of the BBCH-scale . Phenological growth stages and BBCH-identification keys of sunflower
The term "Sunflower Student Movement" referred to protestors' use of sunflowers as a symbol of hope as the flower is heliotropic. [20] The movement's name in Chinese is (Chinese: 太陽花; pinyin: taì yáng hua), a calque of the English word "sunflower", rather than the native term, (Chinese: 向日葵; pinyin: xiàng rì kuí) [21] This term was popularized after a florist contributed 1000 ...
A complete Fermat's spiral (both branches) is a smooth double point free curve, in contrast with the Archimedean and hyperbolic spiral. Like a line or circle or parabola, it divides the plane into two connected regions. Definition of sector (light blue) and polar slope angle α