IMPORTANT QUESTIONS

1. Q241 What is the meaning of energy in an ecosystem? Explain with example how energy is lost at the various energy levels.

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2. Q242 On the basis of the following features identify correct option: A- all elements of this group are gases. B- All elements are chemically inert under ordinary conditions.

   • (a)Group 18
   • (b)Group 17
   • (c)Group 14
   • (d)Group 16

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3. Q243 How does binary fission differs from multiple fission? Give any two differences.

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4. Q244 Assertion: Both bats and whales are classified as mammals. Reason: Bats and whales have four chambered heart. .

   • (a)Both A and R are true and R is the correct explanation of A
   • (b)Both A and R are true but R is NOT the correct explanation of A
   • (c)A is true but R is false
   • (d)A is false but R is true
   • (e)Both A and R are false

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5. Q245 Assertion: Senescence is delayed by the application of cytokinin in plants. Reason: Cytokinin prevents the breakdown of chlorophyll, proteins and nucleic acid.

   • (a)Both A and R are true and R is the correct explanation of A
   • (b)Both A and R are true but R is NOT the correct explanation of A
   • (c)A is true but R is false
   • (d)A is false but R is true
   • (e)Both A and R are false

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6. Q246 What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)

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7. Q247 Give four characteristics of image formed by plane mirror. What is diverging lens?

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8. Q248 State Flemings Right hand rule.

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9. Q249 What will happen if we pass the current for a long time through a resistor? How can we avoid it?

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10. Q250 Where will be the image formed in convex lens, if the object is at infinity? What will be the size of the image?

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