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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.
Double fertilization It carries two sperm cells to the female. A characteristic of angiosperms in which the pollen tube gametophyte in the ovule. The one sperm cell fuses with the
What are the Sources of Vitamin K? As mentioned above, in plants, the only important molecular 'form of vitamin K is phylloquinone. Phylloquinone is distributed ubiquitously th
Q. Bacteria are prokaryotic cells, i.e., they don't have a membrane-delimited nucleus. Eukaryotes have cells with a delimited nucleus. Where in these kinds of cells can DNA are fou
Genetics of Nitrogen-fixation The genetics of nitrogen-fixation is known in detail in Klebsiella pneumoniae. There are twenty genes required in organising the complete N 2 -fi
What are sarcomeres? Sarcomeres are the contractile units of the muscle tissue formed of alternating actin blocks (thin filaments) and myosin blocks (thick filaments). Various
Cation Saturation and Nutrient Absorption by Plants The availability of adsorbed cations is not always so easy as the above explanation might suggest. This is because, several
How the digestive system work?
Q. What is severity of the oesophagitis? The severity of the oesophagitis resulting from oesophageal reflux is determined by the content of gastric reflux mucosal resistance,
binomial nomenclature is not applicable to
classification of coelenterats?
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