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Title: Define negative orthogeotropic growth, Negative plageotropic growth?... Post by: Muskaan on Dec 10, 2011 Define:
a. negative orthogeotropic growth b. Negative plageotropic growth c. plageotropic growth d. ageotrophic growth e. positive plageotropic growth f. positive orthogeotrpic growth Title: Re: Define negative orthogeotropic growth, Negative plageotropic growth?... Post by: duddy on Dec 11, 2011 a. negative orthogeotropic growth f. positive orthogeotrpic growth This could help: Positive and negative geotropism together are also called ortho-geotropism. It causes the vertical (orthotropic) orientation of the plant’s axis. Shoot growth is mostly negatively geotropic since shoots grow upwards even in complete darkness. Phototropism can therefore be understood as a secondary process, usually of the same direction as the negative geotropism. Transversal geotropism is a direction of growth that is vertical to the shoot axis. The direction of many lateral shoots, side roots, leaves, etc. is described by this term. All directions diverting from that of the shoot axis are called plagiotropic. Orthotropic organs (shoot axis, main root) are usually of radial symmetry, plagiotropic organs (leaves, side roots, etc.) are mostly of dorsiventral organisation. |