Biology with Aritra

Camera Lucida It is a device which is used for making  drawing of Microscopic animals.A prism is attached with the metal base.Its fits on the head of simple compound microscope.Camera Lucida(in Latin) meaning Light Chamber.This device performs a superimposition of the specimen which is viewed upon the surface upon which the scientist/students drawing.It is allows the students to draw a duplicate image of that specimen.This device was patented by Sir William Hyde Wollaston in the year of 1807.He was an English Chemist and Physicist.He also famous for discovering Palladium and Rhodium.

Take 50 grams of Sodium hydroxide and 15 gm of  Potassium/Sodium Iodide and dissolved in 100 ml of Distilled Water.

How to make Acid Fuchsin stain for laboratory use? Take 10 percent Hcl (25 ml) and add 0.5-1 gm of Fuchsin powde r in it.Then add 300 ml distilled water in it.

How to make starch Solution for Laboratory Use? ANS : Weight 10 gm starch Powder .Dilute in 100 ml of distilled water and heat for 10 minutes at 80 degree centigrade. After heating cool it at room temperature and use for experiment.

1.Reddish brown coloured beetle. 2.11 segmented antenna and the terminal end is club shaped. 3.3.5 to 3.7 mm in length. 4.Abdomen covered by elytra. Hence.the given specimen seems to be Tribolium sp.

1.Presence of large neural canal. 2.Short Neural spine. 3.Presence of vertebral foramen. 4.Transverse process fan like. Hence,It is the Atlas Vertebra of Cavia sp.

1.Neural Canal narrow. 2.Flat neural spine. 3.Presence of Intervertebral foramens.

1.Neural spine large and thin. 2.Small transverse process. 3.Presence of Odontoid process. 4.Presence of vertebrarterial foramen. Hence,it is the axis vertebra of Cavia sp.

1.Neural spine is long. 2.Short Transverse processes. 3.Neural arch is notched in front. 4.Big neural canal. Hence,it is an Anterior thoracic vertebra of Cavia sp.

Systematic Position Naming - Aurelia sp. Phyulum - Cnidaria      Class - Scyphozoa         Order - Discomedusae            Genus - Aurelia 1. Diploblastic animal with cnidoblast cell.     Hence, Phylum- Cnideria 1. Presence of oral arms.     Hence, Class- Scyphozoa 1. Square mouth.     Hence, Order- Discomedusae 1. Pendent manubrium is surrounded by four long oral arms. 2. Highly branched radial canal. 3. Horse-shoe shaped gonads, endodermal in origin.           Hence, the given specimen seems to be Aurelia sp .