All factors, providing energy in environment or factors, regulating rates of various metabolic and catabolic processes of organisms called physical factors or rate limiting factors. What is the soul source of solar energy ? Firstly, the sun is the extremely powerful energy source. Sunlight is the largest source of energy …

What is Plant Biotechnology? Plant biotechnology can be defined as the use of tissue culture and genetic engineering techniques to produce genetically modified plants that exhibit new or improved desirable characteristics.   A Short History of Plant Biotechnology The foundations of modern plant biotechnology can be traced back to the …

Microtubules are part of the cytoskeleton and can assemble into bundles, for example, the cortical microtubules, the spindle and the phragmoplast. Discovery: De Robertis and Franchi (1953) reported the presence of microtubules in cell. Ledbetter and Porter (1963) found microtubules in the cytoplasm and termed as “Cytotubule”. Distribution: Fawcett and …