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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

Formation of heat shock proteins in plants results in___________?
A Elevation of temperature in cold conditions.
B Embracing the enzymes and other proteins and prevent their denaturation.
C Change the chemical nature of other proteins thus making them heat resistant.
D Help in evaporative cooling.
Correct Answer: Embracing the enzymes and other proteins and prevent their denaturation.
Panting is a representative of which mechanism?
A Pigmentation.
B Respiration.
C Evaporative cooling.
D Excretion.
Correct Answer: Evaporative cooling.
Brown fat present in certain mammals is specialized in___________?
A Providing insulation in cold environment.
B Providing insulation in hot environment
C Rapid heat production.
D Controlling heat production.
Correct Answer: Rapid heat production.
It has been estimated that in a normal person plasma constitutes about ________ by volume of blood.
A 35%
B 45%
C 55%
D 75%
Correct Answer: 55%
Which of the following is true about hearts of earthworm?
A There are 5-7 pairs of heart.
B They are present between 1-7th segments.
C They are present lateral to the oesophagus.
D They pump blood from ventral to dorsal vessel.
Correct Answer: They are present lateral to the oesophagus.
Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis
A Diffusion
B Active transport
C Osmosis
D All of these
Correct Answer: Active transport
Single circuit heart is found in_________?
A Fishes
B Amphibians
C Reptiles
D Mammals
Correct Answer: Fishes
Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap
A Increases.
B Lowers.
C Doesn’t effect.
D Maintains.
Correct Answer: Lowers.
Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.
A Bacteria
B Viruses
C Fungi
D Cyanobacteria
Correct Answer: Fungi
Low level of CO2 favours _________ of the stomata.
A Opening
B Closure
C Both of these
D None of these
Correct Answer: Opening
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