Quiz 10th Science

1. Conversion of light energy to chemical
energy and splitting of water molecules
into hydrogen and oxygen.

2. If the alveolar surface were spread out, it would cover about 80 m2.

3. Hypertension is caused by the constriction of arterioles which can lead to the rupture of an artery and internal bleeding.

4. Breakdown of pyruvate using oxygen takes place in the mitochondria.

5. The pancreas secretes pancreatic juice which contains enzymes like trypsin for digesting proteins and lipase for breaking down emulsified fats.

6. Blood goes only once through the heart in the fish during one cycle of passage through the body.

7. The food we eat is stored in our body in the form
of glucose.

8. Arteries collect the blood from different organs and bring it back to the heart.

9. The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the
following types of reaction?

10. The reaction between carbon and oxygen is represented by C(s) + O2(g) → CO2(g) + Heat. In which
of the type(s), the above reaction can be classified?

(i) Combination Reaction (ii) Combustion Reaction
(iii) Decomposition Reaction (iv) Irreversible Reaction

11. The guard cells swell when water
flows into them, causing the stomatal pore to open.

12. The trachea  provides a surface where the exchange of gases can take place.

13. pyruvate converts into CO2 and water molecule in mitochondria.

14. Sphygmomanometer measures blood pressure in human body.

15. Villi  increases the surface area for absorption.

16. Photolysis is a decomposition reaction caused by ___________

17. Rings of cartilage are present in the throat. These ensure that the air-passage does not collapse.

18. Which gas is released in the picture ?

19. Plasma transports food, carbon dioxide and nitrogenous wastes in dissolved form.

20. The saliva contains an enzyme called salivary amylase that breaks down starch which is a complex molecule to give simple sugar.

21. The break-down of glucose, a six-carbon molecule, into  pyruvate takes place in the mitochondria.

22. Powdered CaCO3 reacts more rapidly than flaky CaCO3 because of ___________.

23. The hydrochloric acid creates an acidic medium which
facilitates the action of the enzyme pepsin.

24. In conversion of ATP into ADP energy is released.

25. Paramoecium has a definite shape and food is taken in at a specific spot.

26. In demonstration of photosynthesis carbon dioxide is used in it. The potassium
hydroxide is used to absorb
carbon dioxide.

27. What will the product in burning of magnesium?

28. The normal systolic pressure is about 120 mm of Hg and diastolic pressure is 80 mm of Hg.

29. The heterotrophs survival depends directly or indirectly on autotrophs.

30. Reduction of carbon dioxide to
carbohydrates.

31. Exchange of material between the blood and surrounding cells takes place across the capillaries.

32. The molecular formula of an open chain organic compound is C3H6. The class of the compound
is

33. the complete digestion of carbohydrates, proteins and fats take place in stomach.

34. Parasitic nutritive strategy is used
by a wide variety of organisms like cuscuta (amar-bel), ticks, lice,
leeches and tape-worms.

35. The exit of waste of digestive  material is regulated by the anal sphincter.

36. chlorophyll is not essential for photosynthesis.

37. Which metal is found in liquid state at room temperature?

38. Carnivores like tigers have a longer  small intestine.

39. Carbon dioxide is more soluble in water than oxygen is and hence is mostly transported in the dissolved form in our blood.

40. Lipase converts  fats into fatty acids and glycerol.

41. The atomic number of that element which can be cut with knife easily.

42. Bio-catalysts called enzymes.

43. The mucus protects the inner lining of the stomach from the action of the acid under normal conditions.

44. The respiratory pigment is haemoglobin  has a very high affinity for carbon dioxide.

45. Amphibians or many reptiles have two-chambered hearts.

46. The IUPAC name of an organic compound is 3-Methyl butan-1-ol. What type compound it is?

47.

1. A solution turns red litmus blue, its pH is likely to be

48. Veins carry blood away from the heart to various organs of the body.

49. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains

50. H2(g) + Cl2(g) → 2HCl(g) is a