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Biology 1525 MCQs [All-Courses]

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Biology covers key concepts of life, organisms, and human systems with exam-focused notes for PPSC, FPSC, KPPSC, BPSC.,NTS, OTS, AJKPSC. Clear, concise topics help students prepare effectively for competitive tests.

All Topics  1525

Each ach nephridium of earthworm opens to the exterior by__________?
A Nephrostome
B Nephridiopore
C Flame cell
D Anus
Correct Answer: Nephridiopore
Amount of water required to excrete 1gN of Urea is_________?
A 1 ml
B 50 ml
C 100 ml
D 150 ml
Correct Answer: 50 ml
Purine and pyrimidine metabolism results in production of____________?
A Creatinine
B Trimethyamine oxide
C Xanthine
D None of these
Correct Answer: Xanthine
Which of the following statement about conifers is correct?
A Stored excretory products in vacuoles, at a concentration that leads to crystal formation.
B Accumulate waste in leaves, which fall in autumn.
C Production of black wood in the center.
D Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.
Correct Answer: Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.
Which excretory product in produced in plants during autotrophic mode of life?
A CO2
B H2O
C O2
D Both A and B
Correct Answer: O2
Which of the following marine fishes are considered direct descendents of fresh water ancestors?
A Hagfish
B Jelly Fish
C Star Fish
D Bony fishes
Correct Answer: Bony fishes
Most of the marine invertebrates are__________?
A Osmoconformers
B Osmoregulators
C Both depend upon the concentration of sea water
D None of these
Correct Answer: Osmoconformers
Which of the following represents osmoregulatory steps taken by hydrophytes?
A Increases transpiration by increasing the surface area of the leave.
B Small and thick leaves to decrease the surface area proportional to the volume of the leave.
C Stomata closing in sufficient supply, and opening in restricted supply of water.
D None of these
Correct Answer: Increases transpiration by increasing the surface area of the leave.
The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called________?
A Homeostasis
B Hemostasis
C Osmoregualtion
D Thermoregulation
Correct Answer: Osmoregualtion
Fishes, most of the invertebrates and amphibians are examples of ________ animals?
A Endotherms
B Ectotherms
C Heterotherms
D Homeotherms
Correct Answer: Ectotherms
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