Do you believe that geographic information system wil conserve environment? It so write its methods and importance.

Answer the following questions . a. The earth's magnetic field varies from point is space. Does it also change with time ? It so , on what time scate does it change appreciably ? b. The earth's core is known to contain iron. Yet geologists do not regard this as a source of the earth's magnetism why ? c. The charged currents in the outer conducting regions of the earth's core are thought to be responsible for earth's magnetism . What might be the ' battery ' (i.e., the source of energy) to sustain these currents ? d. The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth's field in such distant past ? e. The earth's field departs from its dipole substantially at large distances (greater than about 30,000 km) what agencies may be responsible for this distortion ? f. Interstellar space has an extremely weak magnetic field of the order of 10^(-12) T, Can such a weak field be of any significant consequence ? Explain. [Note : Exercise 2 is meant mainly to arouse your curiosity . Answers to some question above are tentative or unknown . Brief answers wherever possible are given at the end . For details , you should consult a good text on geomagnetism.]

We know that the sound is a form of energy. So, the large amount of energy produced due to the sound pollution in cosmopolitan cities can be used to our day to day needs of energy. It also helps us to protect biodiversity in urban areas”. Do you agree with this statement? Collect information on this and write a report.

What do you mean by Embryoids? Write its application.

Write each of the following statements in the form "if-then" i. You get a job implies that your credentials are good. ii. The bannana trees will bloom if it stays warm for a month. iii. A quadrilateral is a parallelogram if its diagonals bisect each other. iv. to get an A^(+) in the class, it is necessary that you do all the exercises of the book.

Under threat or attack, garden lizard loses a part of its tail which trembles and avert the attention of predators, so that the lizard escape later the tail regrown for lizard. The same phenomenon can also be noticed in organisms like starfish etc. What do you call this phenomenon? Define it.

Read the following passage and answer the questions that follow Rahini and her parents were waching a televison programme . An advertisement flashed on the screen which was promoting use of sanitary napkins . Rahini's parents suddenly changed the channel , but she objected to her parents and explained the need and importance of such advertisment . Do you think that Rahini's objection towards her parents was correct ? If so , why ?