Distinguishing characters of Pteridophytes

Pteridophytes: 1. The life cycle shows distinct heteromorphic alternation of generation. 2. Plant body of Sporophyte is dominant phase. 3. Sporophyte is differentiated into true root, stem and leaves. 4. Vascular tissue i.e xylem and phloem are present. Xylem lacks vessels but tracheids are present. In phloem sieve tubes and companion cells are absent. 5. … Read more Distinguishing characters of Pteridophytes

Transpiration Pull Theory

This is also called as cohesion-tension theory put forward by Dixon and Joly (1894) and supported by Renner, Curtis and Clark. This theory is based on a number of features. Cohesion and Adhesion Mutual attraction between water molecules is called cohesion and this force may have a value as high as 350 atmospheres. The wall … Read more Transpiration Pull Theory

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