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An organism X having breathing organs A lives on land. When organism X goes under water, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of water, it dies after a short while. A third organism Z having breathing orgains C and D which lives on the banks of ponds, lakes and rivers can survive on land as well as in water equally well. (a) What could organism X be? Name the breathing organs A. (b) What could organism Y be? Name the breathing orgains B. (c) What could organism Z be ? Name the breathing organs C and D (d) Out of X, Y and Z, which organism is (i) amphibian, (ii) aquatic, and (iii) terrestrial ?

Statements : Many school buses fitted CNG kit without observing the safety guidelines properly. This results into some instances of these buses catching fire due to short circuit and endangering the lives of the school children. Course of action I. The regional transport authority should immediately carry out checks of all the school buses fitted with CNG kit. II. The management of all the schools should stop hiring buses fitted with CNG kit. III. The government should issue a notification banning school buses for use of CNG kit.

A : Poultry farming has definite advantage over live-stock rearing R : Poultry birds are easy to raise, can be acclimatised to a wide range of climatic conditions, have short life span and are prolific breeders

(a) How many million year ago, gigantic reptiles used to dominate on earth ? Give their common name and also mention the period and year in which they were predominanat on earth. (b) Why did these gigantic reptiles disappear from the earth in a short duration ? (c ) Name the most advanced living reptiles. List atleast two characters in which they resemble in mammals.

The diagrams shows vertical sections of kidneys of coypu, brown rat and kangaroo rat, showing the relative size and are never short of water to drink. Brown rats are able to go some days without drinking. Kangaroo rats are able to live in deserts without drinking at all. Which kidney belongs to which animal.?

A short living plant in called.

Study the following information carefully and answer the questions given below: Ten people live in three buildings namely A, B and C. Building A is to the immediate left of building B whereas building C is to the second right of building A. A maximum of four people live in a building. Note: Immediately above or below implies that the person is not in the same building. As many floors are there below the floor, in which T lives, as it is above the floor in which Y lives. There are four floors above the floor in which S lives. S doesn’t live in building B but lives at floor number 5. Z lives in that floor number, which is the sum of the floor number in which R and S live. The sum of the floor number in which P and T lives is 3 and both lives in different building. R lives in building B and lives at the topmost floor. T and Y live in same building but they do not live in building A. The sum of the number of the floor in which T and V lives is equal to the floor number in which Y live. T lives in the even numbered floor. Equal number of floors are there below the floor in which Q lives and above the floor in which W lives. There are two floors between W and Q. U lives on that floor number which is immediately below the floor number in which V lives. Only Two people live in Building C. S and U live in same building. R lives immediately two floor above the floor in which S lives. How many persons live between the floor on which Z and P live?