Biology MCQs

1496 MCQs  — Everyday Science MCQs  (Page 130 of 150)

Attempt Biology Quiz
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
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Stomatal transpiration is __________ of total transpiration
A. 90%
B. 91%
C. 93%
D. 95%
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___________ function as multisensory hydraulic valve?
A. Lenticels
B. Guard cells
C. Hydathods
D. All of these
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_________ give rise to macrophages, which destroy larger particles by phagocytosis.
A. Nautrophils
B. Basophila
C. Monocyte
D. Lymphocyte
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Which of the following are proteins in nature?
A. Antibodies.
B. Interferons
C. Antitoxins
D. All of these
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Aerating openings formed in the bark through which exchange of gases takes place and water is lost in the form of vapours are___________?
A. Hydathods
B. Stomata
C. Lenticels
D. None of these
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Lenticels look like__________?
A. A big pore
B. Stoma
C. Sponge
D. Cars or small protusions
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Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called___________?
A. Diffusion.
B. Facilitated diffusion.
C. Passive transport.
D. Active transport.
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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
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Which of the following have thickest walls?
A. Arteries
B. Veins
C. Capillaries
D. None of these
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Word of the Day
13 Jul
Debunk
expose the falseness or hollowness of (an idea or belief).
بے نقاب کرنا، پول کھولنا

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