Quiz 10th Science

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

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

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

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

5. 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

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

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

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

9. Villi  increases the surface area for absorption.

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

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

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

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

14. What will the product in burning of magnesium?

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

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

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

18. Which gas is released in the picture ?

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

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

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

22. Carnivores like tigers have a longer  small intestine.

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

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

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

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

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

28. Bio-catalysts called enzymes.

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

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

31. chlorophyll is not essential for photosynthesis.

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

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

34. Reduction of carbon dioxide to
carbohydrates.

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

36. Photolysis is a decomposition reaction caused by ___________

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

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

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

40. H2(g) + Cl2(g) → 2HCl(g) is a

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

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

43.

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

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

45. Lipase converts  fats into fatty acids and glycerol.

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

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

48. Sphygmomanometer measures blood pressure in human body.

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

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