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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

Which of the following statement about Homeostasis is incorrect?
A There is a definite control system that regulates the homeostatic activities
B Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
C Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment
D All are correct
Correct Answer: Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane?
A Change in membrane protein composition.
B Change in the solute composition of the cell membrane which prevents crystallization.
C Increase in proportion of unsaturated fatty acids.
D Development of heat shock proteins.
Correct Answer: Increase in proportion of unsaturated fatty acids.
Which of the following mechanism explains development of anemia in Renal failure?
A Failure of bone marrow is accompanied with renal failure.
B Destruction of RBC results from accumulated urea in the blood.
C Chronicity of the disease is respobsible for anemia
D Failure of proper RBC synthesis, due to lack of chemical stimulation.
Correct Answer: Failure of proper RBC synthesis, due to lack of chemical stimulation.
Which of the following constituent is/are maximum in the filtrate that leaves proximal convoluted tubules?
A Glucose
B Amino acids
C Nitrogenous waste
D All of these
Correct Answer: Nitrogenous waste
Protonephridia are present in____________?
A Round worms
B Flateworm
C Tape worms
D Segmented worms
Correct Answer: Flateworm
Aquatic animals excrete nitrogenous waste commonly in the form of_____________?
A Ammonia
B Urea
C Uric acid
D Trimethylamine oxide
Correct Answer: Ammonia
Terrestrial animals like kangaroo rat survive even without drinking water since__________?
A They don’t require water for their metabolic process
B They can retain excessive water in their body during raining season.
C They feed on carbohydrate rich seeds which can provide them with metabolic water
D They are anhydrobiotic organisms
Correct Answer: They are anhydrobiotic organisms
Which among the following is an Autotroph _________ ?
A Butterfly
B Mushroom
C Fish
D Algae
Correct Answer: Algae
The biggest group of invertebrates is_________?
A Worms
B Insects
C Jelly fish
D None of these
Correct Answer: Insects
The body of ________ is not made of cell.
A Bacteria
B Fungi
C Viruses
D Algae
Correct Answer: Bacteria
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