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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".
When sunflowers reach full maturity, they no longer follow the sun and continuously face east. Young flowers reorient overnight to face east in anticipation of the morning. Their heliotropic motion is a circadian rhythm, synchronized by the sun, which continues if the sun disappears on cloudy days or if plants are moved to constant light. [ 9 ]
All India Secondary School Examination, commonly known as the class 10th board exam, is a centralized public examination that students in schools affiliated with the Central Board of Secondary Education, primarily in India but also in other Indian-patterned schools affiliated to the CBSE across the world, taken at the end of class 10.
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.
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 ...
[citation needed] The name is derived from the Ancient Greek words ἥλιος (helios, sun) and χρῡσός (chrysos, gold). It occurs in Africa (with 244 species in South Africa), Madagascar, Australasia and Eurasia. The plants may be annuals, herbaceous perennials or shrubs, growing to a height of 60–90 cm (24–35 inches).
Helianthus annuus 'Russian Giant' can grow in a neutral to alkaline, well-drained moisture, rich in humus, and moderately fertile soil exposed to full sun. A cane might be needed to support the weight of the bloom.
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