Life Process MCQs
46. The filtration units of kidneys are called [NCERT Exemplar Problems]
(a) ureter
(b) urethra
(c) neurons
(d) nephrons
Answer
Answer: d
47. Oxygen liberated during photosynthesis comes from [NCERT Exemplar Problems]
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose
Answer
Answer: a
48. The opening and closing of the stomatal pore depends upon [NCERT Exemplar Problems]
(a) oxygen
(b) temperature
(c) water in guard cells
(d) concentration of CO2 in stomata
Answer
Answer: c
Direction (Q49 to Q53): In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
49. Assertion: When air is passed through lime water, lime water turns milky.
Reason: Air contains 78% nitrogen and 21% oxygen.
Answer/Explanation
Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
50. Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.
Answer/Explanation
Answer: a
Explanation:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
51. Assertion: Human being has a complex respiratory system.
Reason: Human skin is impermeable to gases.
Answer/Explanation
Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
52. Assertion: All proteins in our food are digested in small intestine only.
Reason: The protein digesting enzymes are released onto small intestine.
Answer/Explanation
Answer: d
Explanation:
(d) The statement of the Assertion is false but the Reason is true.
53. Assertion: Human heart does not allow mixing of oxygen reach blood with carbon dioxide reach blood.
Reason: Human heart has different chambers.
Answer/Explanation
Answer: a
Explanation:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
54. The _____________ is where the respiratory and digestive passage come together.
Answer/Explanation
Answer:
Explanation: pharynx
55. The conditions necessary for photosynthe-sis to take place are _____________ , _____________ , _____________ and _____________ .
Answer/Explanation
Answer:
Explanation: sunlight, chlorophyll, carbon dioxide and water
56. The process in which the digested food passes through the intestinal wall into blood stream is called ________ .
Answer/Explanation
Answer:
Explanation: absorption
57. The teeth covered with a sticky, yellowish layer of food particles and bacteria is called _____________ .
Answer/Explanation
Answer:
Explanation: plaque
58. Iodine turns blue-black on reacting with _____________ .
Answer/Explanation
Answer:
Explanation: starch
59. The energy produced during respiration is stored in the form of ATP which stands for _____________ .
Answer/Explanation
Answer:
Explanation: Adenosine Tri-phosphate
60. Pyruric acid is a three carbon compound which is also known as _____________ .
Answer/Explanation
Answer:
Explanation: pyruvate
61. The rate of breathing in _____________ animals in much faster than in _____________ animals.
Answer/Explanation
Answer:
Explanation: aquatic, terriestial
62. The actual exchange of gases takes place in the _____________ of the lungs.
Answer/Explanation
Answer:
Explanation: alveoli
63. _____________ are long, thin, spindle shaped cell with pits in their thick cell walls.
Answer/Explanation
Answer:
Explanation: Tracheids
64. The liqid part of blood is called _____________ .
Answer/Explanation
Answer:
Explanation: plasma
65. The expansion of an artery each time the blood is forced into it, is called _____________ .
Answer/Explanation
Answer:
Explanation: pulse
66. Gums and resins are the _____________ products of plants.
Answer/Explanation
Answer:
Explanation: waste