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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

There are _________ hypothesis which may explain opening and closing of stomata?

A One
B Two
C Three
D Four
Correct Answer: Two

The opening and closing of stomata is directly controlled by the___________?

A Temperature
B pH
C Light
D None of these
Correct Answer: Light

Pressure flow theory was proposed by_________?

A H-Van Mohl
B Dixon
C Vander wall.
D Earnst Munch
Correct Answer: Earnst Munch

Open circulatory system can contain_________?

A Red Blood Cells
B White Blood Cells
C Haemoglobin
D All of these
Correct Answer: White Blood Cells

95% of the cytoplasm of red blood cells is the___________?

A Antibodies
B Hemoglobin
C Enzymes
D Proteins
Correct Answer: Hemoglobin

_________ give rise to macrophages, which destroy larger particles by phagocytosis.

A Nautrophils
B Basophila
C Monocyte
D Lymphocyte
Correct Answer: Monocyte

___________ function as multisensory hydraulic valve?

A Lenticels
B Guard cells
C Hydathods
D All of these
Correct Answer: Guard cells

Stomatal transpiration is __________ of total transpiration

A 90%
B 91%
C 93%
D 95%
Correct Answer: 90%

A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called___________?

A Transpiration pull
B Root pressure
C Osmotic pressure.
D None of these
Correct Answer: Root pressure

Pulling upward of water and dissolved minerals towards the leaves through the xylem tissue is called__________?

A Transpiration pull
B Root pressure
C Ascent of sap.
D All of these
Correct Answer: Transpiration pull
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