Everyday Science MCQs

5120 MCQs  (Page 419 of 512)

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Pressure flow theory was proposed by_________?
A. H-van mohl
B. Dixon
C. Vander wall.
D. Earnst munch
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The opening and closing of stomata is directly controlled by the___________?
A. Temperature
B. Ph
C. Light
D. None of these
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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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Word of the Day
27 Jul
Widen
make or become wider.
چوڑا ہونا، کشادہ کرنے کا عمل

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