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Solving time: 3 mins

Assertion: All food chains will come to stand still if bacteria disappear from earth.
Reason: Bacteria are only associated with the soil fertility and hardly any role for food chains.

A
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

B
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C
If Assertion is true but Reason is false.

D
If both Assertion and Reason are false.

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Bacteria play an important and dual role by disposing off the dead bodies and wastes of organism and by increasing the fertility of soil.
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Mark, a white, 35-year-old male weighing approximately 70 kilogram (kg) started a three-hour drive across the desert from Yuma, Arizona, to Blythe, California. He set out at 7 AM on what was expected to be a very hot July day. He anticipated that it would take him about three hours to reach Blythe—plenty of time to make his 11 AM appointment with Sarah, his fiancée. When he failed to appear by noon, Sarah became concerned and called the highway patrol. At 12:30 PM, Search and Rescue Officer Maria Arroyo, who was patrolling nearby, reported finding an abandoned car on the side of the road with a damaged radiator that matched Sarah’s description of Mark’s vehicle. Maria noticed shoe prints leading into the desert toward some low mountains in the distance. At that point Maria called for helicopter assistance. By 1 PM Henry Morningstar, paramedic and a member of the helicopter crew reported finding Mark shirtless, hatless, and wandering down a desert wash. The air temperature was hovering at 120° F and the relative humidity was less than 5%. When found, Mark was still conscious but clearly delirious. Physical findings included weakness, nausea, disorientation, and headache. His blood pressure was 70/50mmHg, heart rate 107 BPM, body temperature of 105°F, and anhydrosis. The paramedic also noted first degree burnson his face and back. Oral rehydration with an isotonic solution containing electrolytes, glucose,and water was started, and Mark was transported to the hospital. Assuming that Mark lost around 4 liters of water, what percentage of his body water did he lose? Would you expect his urinary volume to decrease or increase? Please explain your answer. Why was Mark’s blood pressure so low? Please explain the mechanism. (Hint: Blood pressure falls)
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Question Text
Assertion: All food chains will come to stand still if bacteria disappear from earth.
Reason: Bacteria are only associated with the soil fertility and hardly any role for food chains.
TopicBiological Classification
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes136