1. 12. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

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  2. Q34. A jar contains 24 marbles. Some are red and others are white. If a marble is drawn at random from the jar, the probability that it is red is 2/3, then the number of white marbles in the jar is:

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  3. Q30. If 2 cos(A + B) = 1, and 2 sin(A –B) = 1 then the values of A and B are

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  4. Q1. Given that sin θ = a/b then cos θ is equal to:

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  5. 1.The tubes – blood vessels – Arteries are the vessels which carry blood away from the heart to various organs of the body. Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls. Veins collect the blood from different organs and bring it back to the heart. They do not need thick walls because the blood is no longer under pressure, instead they have valves that ensure that the blood flows only in one direction. On reaching an organ or tissue, the artery divides into smaller and smaller vessels to bring the blood in contact with all the individual cells. The smallest vessels have walls which are one- cell thick and are called capillaries. Exchange of material between the blood and surrounding cells takes place across this thin wall. The capillaries

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  6. 2.During inhalation, the diaphragm is contracted which increases the volume of the lungcavity. During exhalation, the diaphragm is relaxed which decreases the volume of thelung cavity. The given graph is related to the changes in the volume of lungs of a person at a rest over a period of 20 seconds.

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  7. In the following questions a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

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  8. 12. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

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  9. Q35. A number is selected at random from first 50 natural numbers. Then the probability that it is a multiple of 3 and 4 is:

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  10. Q28.When we produce a good by exploiting natural resources it is called

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