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AZOLLA CULTIVATION

                                                                       AZOLLA CULTIVATION   Azolla is an aquatic floating fern. The fern appears as a green mat over water. The Blue Green Algae cyanobacteria (Anabaena arollae) present as a symbiont with this fern in the lower cavities actually fixes atmospheric nitrogen It contains 1.96-6.30% nitrogen; 0.016-1.59% P₂O, and 1.31-5.90% KO in addition it also contains calcium, magnesium, sulphur and iron and 25-30% protein. It also contains amino acids, minerals, vitamins and beta carotenes which are essential to livestock's. Azolla can be a substitute for chemical nitrogenous fertilizers to a certain extent (20 kg/ha) and it increases the crop yield and quality. It is a good feed...
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Lab on Cell Biology

  Light microscopes (optical microscope) Principle of a light microscope (optical microscope) As mentioned earlier, light microscopes visualize an image by using a glass lens, and magnification is determined by, the lens’s ability to bend light and focus it on the specimen, which forms an image. When a ray of light passes through one medium into another, the ray bends at the interface causing refraction. The bending of light is determined by the refractive index, which is a measure of how great a substance slows the speed of light. The direction and magnitude of the bending of the light are determined by the refractive indexes of the two mediums that form the interface.   They use lenses to focus light on the specimen, magnifying it thus producing an image. The specimen is normally placed close to the microscopic lens.   Microscopic magnification varies greatly depending on the types and number of lenses that make up the microscope. Depending on the number of lenses, there are ...
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University questions

B.Sc.ZOOLOGY DEGREE EXAMINATION, APRIL 2016 Sixth Semester Sub.Code: GMZO61 Code No. 31145 Zoology - Main APPLIED BITECHNOLOGY (For those who joined in July 2012 and afterwards) Time: 3hours Maximum :75 marks PART A—(10 × 1 = 10 marks) Answer ALL questions Choose the correct answer: 1. In the sedimentation process of sewage treatment the chemical used is (a) Aluminium sulpahate- Alum (b) Ferric choride (c) Ferric sulphate (d) All of theese 2. The cleaning up of toxic contaminants in the environment using the activity of natural microbial population is referred as (a) Biodegradation (b) Biomonitoring (c) Biotransmission (d) Biopolymerisation 3. The father of plant tissue culture is (a) Skoog (b) Miller (c) Haber Landt (d) Nitsch 4. The number of genes present in ‘nif’ gene cluster is (a) 21 (b) 19 (c) 17 (d) 15 5. The fermentor commonly used to carryout fermentation reaction is (a) Stirred tank reactor (b) Air lift fermentof (c) Cyclone fermentor (d) All of these 6. Metaboloites which ...
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