Man and his Environment MCQs for MDCAT Practice

Biology section, Man and his Environment chapter. Sample questions from past PMC papers.

1. Question 1
   What is the reason for the highest biomass being present in the aquatic ecosystem?
   • A.Nano plankton, blue-green algae, and green algae
   • B.Sea grass and slime molds
   • C.Benthic and brown algae
   • D.Diatoms
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2. Question 2
   The six critical elements of life are hydrogen, carbon, nitrogen, oxygen and:
   • A.Calcium and phosphorus
   • B.Sodium and phosphorus
   • C.Potassium and phosphorus
   • D.Sulfur and phosphorus
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3. Question 3
   Ultraviolet radiations from sunlight causes a reaction that produces:
   • A.Fluorides
   • B.Carbon monoxide
   • C.Sulphur dioxide
   • D.Ozone
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4. Question 4
   Giraffes and koalas live in the same forest and feed on grass. What is the ecological interaction between giraffe and koala?
   • A.Predation
   • B.Parasitism
   • C.Competition
   • D.Commensalism
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5. Question 5
   Which one of the following pairs is not correctly matched?
   • A.Streptomyces- Antibiotic
   • B.Serratia-Drug addiction
   • C.Spirulina Single-celll protein
   • D.Rhizobium­-Biofertilizer
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6. Question 6
   In an area where DDT had been used extensively, the population of birds declined significantly because:
   • A.Birds stopped laying eggs.
   • B.Earthworms in the area got eradicated.
   • C.Cobras were feeding exclusively on birds.
   • D.Many of the birds eggs laid, did not hatch.
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7. Question 7
   Select the correct food chain:
   • A.Grass -- Chameleon -- Insect -- Bird
   • B.Grass -- Fox -- Rabbit -- Bird
   • C.Phytoplankton -- Zooplankton -- Fish
   • D.Fallen leaves -- Bacteria -- Insect larvae
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8. Question 8
   Which of the following describes an ecological niche?
   • A.The physical location where an organism finds its food supply
   • B.The habitat providing the most favorable climate for an organism
   • C.The interactions between an organism and other species within its ecosystem
   • D.The comprehensive role and strategies of an organism in utilizing its environment
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