Given below are certain features of mouse. Read them and select why mouse is the most preferred animal for studies on gene transfer
(i) Short oestrous cycle and gestation period
(ii) Relatively short generation time
(iii) Covenient in vitro fertilisation
(iv) Production of several offspring per pregnancy

Read the given sentences, each with one or two blanks and select the option that correctly fills any four of these. (i) P causes ulcers in stomach and duodenum. (ii) diseases last for only short period of time but are severe. (iii) R diseases are anatomical or physiological abnormalities present since birth, e.g. S (iv) Malaria causing microbes are transmitted through bite of infected T and move to U and then red blood cells of humans.

Study the four statements given below and answer the question which follow them. I) Inbreeding is necessary if we want to develop a pureline in animals II) inbreeding exposes harmful recessive genes that are eliminated by selection III) continuous inbreeding usually reduces fertility and productivity IV) inbreeding depression can be overcome by outcrossing How many of the above statements are correct?

The statements given below describe certain features of some common amphibians. Read them carefully and identify which statements are True (T) and False(F). I. the male Pipa carries eggs around its thighs still the tadpoles are ready to hatch. II. Alytes carries the eggs and tadpoles in its vocal sac. III. Salamandra alra is a vovoviviparous animal. IV. The eggs of Inhthyphis are guarded by the male. ,Choose the correct option.

The statements given below mention certain characteristic features of Nereis . Select the correct statements and mark the correct code . I . The body of Nereis is divisible into head , truck and pygidium . II . Anus is mid-dorsal in position present on the 26th segment . III. Prostomium bears a pair of short , cylindrical , sensory tentacles . IV . It is an omnivorous annelid .

Study carefully the following statements and select the incorrect ones. When fats are used in respiration, the RQ is more than unity because fats contain more O_(2) and require relatively less amount of O_(2) for oxidation. (ii) The most important energy carrier is ATP. This energy rich compound is mobile and can pass from one cell to another. (iii) Before pyruvic acid enter Krebs' cycle, one of the two carbon atoms of pyruvic acid is reduced to carbon dioxide in the reaction called reductive carboxylation. (iv) A special electron carrier system located in the mitochondrial membrane is called shuttle system. It transfers electron from the hydrogens of cytoplasmic NADH to the mitochondrial electron carriers across the mitochondrial membrane. (v) Zymase is a complex mixture of many enzymes which requires several coenzymes for its action. The enzyme complex-zymase catalyses series of reaction taking place during fermentation leading to the production of ethyl alcohol.

Study carefully the following statements and select the incorrect ones. When fats are used in respiration, the RQ is more than unity because fats contain more O_(2) and require relatively less amount of O_(2) for oxidation. (ii) The most important energy carrier is ATP. This energy rich compound is mobile and can pass from one cell to another. (iii) Before pyruvic acid enter Krebs' cycle, one of the two carbon atoms of pyruvic acid is reduced to carbon dioxide in the reaction called reductive carboxylation. (iv) A special electron carrier system located in the mitochondrial membrane is called shuttle system. It transfers electron from the hydrogens of cytoplasmic NADH to the mitochondrial electron carriers across the mitochondrial membrane. (v) Zymase is a complex mixture of many enzymes which requires several coenzymes for its action. The enzyme complex-zymase catalyses series of reaction taking place during fermentation leading to the production of ethyl alcohol.