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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.
Temperate evergreen forest - Ecosystem Many parts of the world have a mediterranean type of climate which is characterised by warm, dry summers and cool, moist winters. These
Causes of Apomixis Apomictic species are generally hybrids or polyploids, as a consequence, there is irregular meiosis. Apomixis appears to be controlled by a set of genes. T
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1. Explain why a gain of function would be a dominant effect and a loss of function would be a recessive effect. Which types of genes are each associated with: oncogenes or defect
In eukaryotes possibly the most rapid and complex signaling is mediated through nerve impulses. The Nerve cells (neurons) consist of a cell body with numerous projections
(a) What is the distinction among 'breathing' and 'respiration'? (b) What part do 'ventilation' and 'gaseous exchange' play in these processes? (a) Breathing i
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Explain the Miracidium larva? Miracidium is the first stage larva that comes out from the fertilized egg. i) Miracidium is an oval, microscopic, flattened larva which appear
What are arterial vessels, arteries and arterioles? Arterial vessels are each blood vessel that carries blood from the heart to the tissues. Arteries and arterioles are arteria
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