Biology 1525 MCQs [All-Courses]

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.

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.

Review Detailed Answer

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.

Review Detailed Answer

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.

Review Detailed Answer

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%

Review Detailed Answer

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.

Review Detailed Answer

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

Review Detailed Answer

Correct Answer: Active transport

Single circuit heart is found in_________?

A Fishes

B Amphibians

C Reptiles

D Mammals

Review Detailed Answer

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.

Review Detailed Answer

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

Review Detailed Answer

Correct Answer: Fungi

Low level of CO2 favours _________ of the stomata.

A Opening

B Closure

C Both of these

D None of these

Review Detailed Answer

Correct Answer: Opening

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Biology 1525 MCQs [All-Courses]

All Topics 1525

All Topics 1525

Formation of heat shock proteins in plants results in___________?

Panting is a representative of which mechanism?

Brown fat present in certain mammals is specialized in___________?

It has been estimated that in a normal person plasma constitutes about ________ by volume of blood.

Which of the following is true about hearts of earthworm?

Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis

Single circuit heart is found in_________?

Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap

Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.

Low level of CO2 favours _________ of the stomata.