Arrange the following words into two groups and give and appropriate heading to each group. Testes, oviduct, cloaca, Bidder's canal, ovaries, urinogenital duct, vasa efferentia, cloaca.

Arrange the following bones into two columns and give proper heading to each columns. Scapula, Carpals, Femur, Fibula, Tibia, Tarsals, Ac-etabulum, Metatarsals, Radius, Humerus, Glenoid cavity, Clavicle, Metal Carpals, Phalanges, Patella, llium, ischium, Pubis.

Classify the following in to 3 groups and give appropriate headings. Thalamus, Corpora-quadrigemina, Pons, hypothalamus, Cerebrum, Medulla Oblongata.

Arrange the following points in a two column table and give suitable heading for each column. a) Notochord present b) Post ahal tail absent c) Pharynx Perforated by gill slits d) Notochord absent e) Posts anal tail present f) Gill slits are absent

Monosaccharides containing an aldehyde group are called aldoses while those containing aketo group are called ketoses. The aldehyde group is always present at C_1 while the keto group is usually present at C_2 . All monosaccharides containing five and six carbon atoms have cyclic structures, furnaose (five membered) and pyranose (six membered). During ring formation, C_1 in aldoses and C_2 in ketoses becomes chiral and hence all these monosaccharides exist in two stereoisomeric forms called the alpha -anomer and the beta -anomer while C_1 and C_2 are called glycosidic or anomeric carbon atoms. In contrast, stereoisomers, which differ in configuration at any other chiral carbon other than the glycosidic carbon are called epimers. Two molecules of the same or different monosaccharides combine together through glycosidic linkage to form disaccharides. All monosaccharides (aldoses and ketoses) and most disaccharides reduce Tollens'reagent and Fehling's solution, undergo mutarotation and form osazones. Which of the following pairs give positive Tollens' test?

Give possible explanation fòr each of the following: i. Cyclohexanone forms cyanohydrin in good yield but 2,2,6 -trimethylcyclohexanone does not. ii. There are two -NH_2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones. iii. During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.

In a lab work, a teacher has given zinc salt solution for systematic analysis to two students studetn I added NH_4Cl followed by NH_4OH and student II added NH_4OH followed by NH_4Cl for the analyse of group III cations. Predict the observation of each student. Give reasons for difference in observation in any.