In this article we will discuss about Phototropism. After reading this article you will learn about: 1. Fluence-Response Relations of Phototropism 2. Action Spectra and Photoreceptors 3. Auxin and Phototropism. Fluence-Response Relations of Phototropism: Darwin in his book, 'The Power of Movement in Plants' described that the extreme tip of a grass seedling controls the ability of the whole seedling [...]
The following points highlight the two main mechanisms of Gravitropism. The mechanisms are: 1. Sensory Mechanism 2. Reaction Mechanism. Gravitropism: Mechanism # 1. Sensory Mechanism: Plants can perceive the direction of the gravitational stimulus in relation to their orientation, suggesting the existence of some sort of gravity-sensing or geo-perceptive mechanism. Primarily, geo-perception occurs in the root cap or shoot-tip region [...]
The following points highlight the four physical processes involved in movement of substances in plant body. The physical processes are: 1. Diffusion 2. Permeability 3. Osmosis 4. Imbibition. Plant Body: Physical Process # 1. Diffusion: The movement of molecules of gases, liquids or solutes from the region of higher concentration to the region of lower concentration until the molecules are [...]