Give an example for each of the following.
a. A viviparous fish
b. A fish possessing electric organs
c. A fish possessing poison sting
d. an organ which regulates buoyancy in the body of a fish
e. an oviparous animal with milk producing glands.

Which one of the following terms would most correctly describe the relationship between the flight organs of animals like Locust, bat and flying fish

The necessary condition for a molecule to exhibit optical isomerism is dissymmetry or chiral. Thus all organic compounds which contain one assymetric carbon atom are chiral and exist in two stereoisomers. Although the two forms have the same structure, they have different arrangements of groups about the assymmetric carbon. In fact, they represent assymetric molecules. They do not have a plane of symmetry. They are related to each other as an object to its miror image and are non superimposable. The two structures actually stand for dextro or (+) and leavo or (-) isomers. Since they are related each other as mirror images, they are commonly called enantiomers. Consider the following structers A,B,C,D Which of the following statements is not correctConsider the following structers A,B,C,D Which of the following statements is not correct

The necessary condition for a molecule to exhibit optical isomerism is dissymmetry or chiral. Thus all organic compounds which contain one as symetric carbon atom are chiral and exist in two stereoisomers. Although the two forms have the same structure, they have different arrangements of groups about the as symmetric carbon. In fact, they represent as symetric molecules. They do not have a plane of symmetry. They are related to each other as an object to its mirror image and are non superimposable. The two structures actually stand for dextro or (+) and leavo or (-) isomers. Since they are related each other as mirror images, they are commonly called enantiomers. Consider the following structures A,B,C,D Which of the following statements is not correct

Consider the following statements (A-C) each with two blanks . (i) Jellyfish exhibits (A) symmetry whereas cutte fish exhibits (B) symmetry . (ii) Incomplete gut is present in (C ) whereas complete gut is present in (D) (iii) Closed circulatory is present (E ) whereas open circulatory system is present in (F) (iv) Flatworms are (G) whereas roundworms are (H) Which one of the following options , gives the correct fill - ups for both the blank numbers one of the above statements ?

An organic compound (A) of molecular weight 135 on boiling with NaOH evolves a gas which gives white dense fumes on bringing a rod dipped in HCl near it. The alkaline solution thus obtained on acidification gives the precipitate of a compound (B) having molecular weight 136. Treatment of (A) with HNO_2 also yeilds (B), whereas its treatment with Br_2//KOH gives (C). compound (C) reacts with cold HNO_2 to give(D), which gives red colour with ceric ammonium nitrate. On the other hand(E) an isomer of (A) on boiling with dil HCl gives an acid (F), having molecular weight 136. On oxidation followed by heating, (F) gives an anhydride (G) which condenses with benzene in presence of AlCl_3 to give anthraquinone. IUPAC name of compound (B) is

Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements. (A)Wings of butterfly and bird look alike and are the results of (i), evolution. (B) Miller showed that CH_(4), H_(2), NH_(3) , and (1) when exposed to electric discharge in a flask resulted in formation of (ii) (C) Veriform appendix is a (i) organ and an (ii) evidence of evolution. (D) According to Darwin evolution took place due to (i) and (ii) of the fittest.