IMPORTANT QUESTIONS

1. Q81 What are pneumatic bones?

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2. Q82 What are simple epithelial tissues?

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3. Q83 What is an electronic configuration of an element?

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4. Q84 List the general characteristics of pteridophytes.

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5. Q85 Bryophytes are used in pots. Why?

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6. Q86 Why was the system of classification of elements into triads not found suitable?

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7. Q87 What will happen if we kill all the organisms in one trophic level?

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8. Q88 A 10 mm long pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is:

   • (a) - 30 cm
   • (b) - 20 cm
   • (c) - 40 cm
   • (d) - 60 cm

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9. Q89 The metal salt A is blue in color. When salt A is heated strongly over a burner, then a substance B present in it is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C it becomes blue again. (a) Identify A, B, C, D

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10. Q90 Write a chemical equation of the reaction stating its type. The white compound is lead nitrate and brown fumes are of nitrogen dioxide and yellow residue is lead oxide.

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