heliotropism การใช้

• Heliotropism is when a plant follows the sun throughout the day.
• The helianthus ( sunflower ) is a plant that uses heliotropism.
• Some flowers exhibit heliotropism, changing orientation to follow the sun.
• Other kinds of tropisms include gravitropism, phototropism, hydrotropism, and heliotropism.
• They demonstrated no diurnal heliotropism but strong seasonal heliotropism.
• They demonstrated no diurnal heliotropism but strong seasonal heliotropism.
• :With heliotropism, flowers and leaves track the sun as it moves through the sky.
• This alignment results from heliotropism in an earlier development stage, the bud stage, before the appearance of flower heads ( anthesis ).
• When growth of the flower stalk stops and the flower is mature, the heliotropisms also stops and the flower faces east from that moment onward.
• The uniform alignment of the flowers does result from heliotropism in an earlier development stage, the bud stage, before the appearance of flower heads.
• Phototropism was originally called heliotropism, or bending toward the sun, until scientists found out that plants would bend toward light in general, not just sunlight.
• Yet other species ( notably sunflower ) are capable of reorienting their leaves throughout the day to optimize exposure to the Sun : this is known as heliotropism.
• The " M閙oires . . . " published some important new ideas : Malus on the dimorphism ) ( 1809 ); Gay-Lussac and Thenard on the discovery of the amides of metal ( 1809 ); Candolle on heliotropism ( 1817 ).
• Among these are his investigation of the periodicity of growth in length, in connection with which he devised the self-registering auxanometer, by which he established the retarding influence of the highly refrangible rays of the spectrum on the rate of growth; his researches on heliotropism and geotropism, in which he introduced the clinostat; his work on the structure and the arrangement of cells in growing-points; the elaborate experimental evidence upon which he based his " imbibition-theory " of the transpiration-current; his exhaustive study of the assimilatory activity of the green leaf; and other papers of interest.