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Regeneration - Root and Shoot Morphogenesis
Higher plants have three kinds of regenerative activities;
All plants possess inherent ability to regenerate lost parts. For example when a part of mature tissues are removed from stem, the exposed mature cells undergo differentiation, division and re-differentiation to restore the normal pattern. When a branch is cut and wound is made-damaged tissues are cast off and new cells take this place. A wound also results in the formation of a zone of cells that form a thick protective layer. Induction of hormones like auxins and cytokinins that promote cell division is also a reaction to wound and part and parcel of regeneration. Mobilization of nutrients towards the site of injury, synthesis of new hormones, increased cell division and thickening of cell walls etc. are some of the responses and contribute to regeneration.
- The chromosomes at each pole uncoil and elongate to form the chromatin. - A nucleolus reappears at each pole. - Spindle fibers and asters disappear and centrioles split. - A nu
Q. What are target organs of the hormones? Target tissues, Target organs and target cells are those specific organs, cells and tissues upon which each hormone produces and acts
Explain what happens when the cell membrane or plasma membrane ruptures or breaks down? Ans) When cell membrane ruptures Ions leek out and unless repaired in time the cell will
Q. Technical Requirements for pulmonary angiography? Digital subtraction pulmonary angiography with selective pulmonary arterial injections is vastly superior to conventional c
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How is the brain involved in the immune system? A. Immune cells that constitute body's biological defense against infections and toxins, have many things in common with nerve c
Rickets Rickets is a complex mineral deficiency disease of young, growing animals. It is characterized by defective mineralization of growing bones, persistence of hypertrophic
The next set of lectures in this course cover a number of topics including fermenter design, power consumption, oxygen transfer and mixing. The aim of these lectures is to underst
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