IMPORTANT QUESTIONS

1. Q251 A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. In the progeny, all bore violet flowers, but almost half of them were short. This suggest that the genetic makeup of tall plant can be depicted as:

   • (a) TTWW
   • (b)TTww
   • (c)Tt WW
   • (d)TtWw

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2. Q252 The atomic number of Na and Mg is 11 and 12 respectively and they belong to same period. (a) Which one would have smaller atomic size (b) Which one waved be more electropositive? (c) To which group would each one belongs?

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3. Q253 The decomposers in an ecosystem

   • (a) convert inorganic material to simpler forms
   • (b)convert organic material to inorganic forms
   • (c)convert inorganic materials into organic
   • (d)do not breakdown organic compounds

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4. Q254 What is synapse?

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5. Q255 Which part of brain is involved in thinking?

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6. Q256 (a) State two main characteristics of elements on which modern periodic table is based. (b) No fixed position can be assigned to hydrogen in the periodic table. Why?

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7. Q257 During breathing cycle, what is the advantage of residual volume of air in lungs? Explain

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8. Q258 Differentiate between alveoli of lungs and nephrons of kidneys.

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9. Q259 What is translocation in plants?

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10. Q260 What is the valency of element with atomic number 35?

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