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(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.

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 dominant, independent, photosynthetic, thalloid or erect phase is represented by a haploid gametophyte and it alternates with the short-lived multicellular sporophyte totally or partially dependent on the gametophyte for its anchorage and nutrition. This type of pattern is present in

A short living plant in called.

Statement -1 : Actinoids are very difficult to study. Statement-2 : Actinoids are radioactive elements having very short half lives especially of later members of actinides.

In monocotyledonous plants e.g., wheat, the primary root is short lived and is replaced by a large number of roots, these roots orginate from the base of the stem and consitute the-