In this article we will discuss about:- 1. Meaning of Stimulus 2. Mode of Reaction of Stimulus. Meaning of Stimulus: A stimulus is a change in the intensity or direction of application of energy which produces an appreciable effect upon the living protoplast and brings about a visible reaction or response. The stimulus may be an external agency or it [...]
In this article we will discuss about the classification of various plant movements. 1. Autonomic Movements: These movements are due to internal causes. For instance, the organism and reproductive cells move as a whole from place to place. Some of the common examples are ciliary movements. 2. Ciliary Movements: The cilium is a widely occurring organelle of eukaryotic plant cells. [...]
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 [...]