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A short living plant in called.

(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.

Fossil fuels are at the verge of getting exhausted. It is because of their non-replenishment, increasing demand, increasing population and more energy dependent technologies. Therefore, one has to look up to the sources which can be regenerated and cause the minimum possible environmental damage. Ramesh and Suresh are good friends. They live in the same colony and work in the same company. They both use their cars to go to office which run on petrol. As petrol is a non-renewable resource it cannot be replenished within a short duration of time. As a common friend of both what best advise will you give them to save petrol.

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

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 ?

I. Population evolve to maximise their reproductive fitness, also called Darwinian fitness (higher 'r' value) in the habitat in which they live II. The population growth rate r is inversely related to generation time III. The housefly , which has a short life span and produces a large number of eggs, could be considered as a K selected species IV. under a particular set of selection pressures, organisms evolve towards the most efficient reproductive strategies V. life history traits of organisms have evolved in relation to the constrains imposed by biotic and abitioc factors in their habitat. Select the combination of correction statements