The following points highlight the two main types of nastic movements in plants.The types are: 1. Oscillatory Movements 2. Single-Event Movements. Nastic Movement: Type # 1. Oscillatory Movements: Oscillatory nastic movements may be based on either diurnal periods or on shorter periods. Nyctinastic movements are the diurnal movements. The leaflets of Trifolium repens show nyctinastic movement. The terminal leaflet closes [...]
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 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 [...]