What is callus?

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(D) In plant tissue culture,a $callus$ is defined as an unorganized,undifferentiated mass of proliferating plant cells. It is typically formed when pl

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An undifferentiated mass of plant cells

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(D) In plant tissue culture,a $callus$ is defined as an unorganized,undifferentiated mass of proliferating plant cells. It is typically formed when plant explants (such as pieces of leaf,stem,or root) are cultured on a nutrient medium containing specific plant growth regulators (auxins and cytokinins). These cells are capable of further differentiation into various plant organs or whole plants.

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