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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 kernel of the sunflower is the brown part in the middle, and each set of the sunflower is the union of a petal and the kernel. In the mathematical fields of set theory and extremal combinatorics, a sunflower or -system [1] is a collection of sets in which all possible distinct pairs of sets share the same intersection.
Through the words of Plotinus, everything in the universe participates in the "first good", symbolized by the Sun. Blake said that "every natural effect has a spiritual cause": [31] the Sunflower's apparent following of the movement of the Sun is not just a natural effect, but is also the result of divine nature attracting the souls of plants ...
Metallurgy derives from the Ancient Greek μεταλλουργός, metallourgós, "worker in metal", from μέταλλον, métallon, "mine, metal" + ἔργον, érgon, "work" The word was originally an alchemist's term for the extraction of metals from minerals, the ending -urgy signifying a process, especially manufacturing: it was discussed in this sense in the 1797 Encyclopædia ...
Most important task of the board, among few others, is to conduct the SSC for 10th class and HSC for 12th class examinations. [2] It is the most popular education board in terms of enrollment in high school in India only after the Central Board of Secondary Education .
The copper-bronze metallurgy in the Harappan civilization was widespread and had a high variety and quality. [27] The early use of iron may have developed from the practice of copper-smelting. [ 28 ] While there is to date no proven evidence for smelted iron in the Indus Valley civilization , iron ore and iron items have been unearthed in eight ...
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