Biology MCQs

1496 MCQs  — Everyday Science MCQs  (Page 129 of 150)

Attempt Biology Quiz
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
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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.
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Single circuit heart is found in_________?
A. Fishes
B. Amphibians
C. Reptiles
D. Mammals
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There are _________ hypothesis which may explain opening and closing of stomata?
A. One
B. Two
C. Three
D. Four
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Low level of CO2 favours _________ of the stomata.
A. Opening
B. Closure
C. Both of these
D. None of these
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Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.
A. Bacteria
B. Viruses
C. Fungi
D. Cyanobacteria
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95% of the cytoplasm of red blood cells is the___________?
A. Antibodies
B. Hemoglobin
C. Enzymes
D. Proteins
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Open circulatory system can contain_________?
A. Red blood cells
B. White blood cells
C. Haemoglobin
D. All of these
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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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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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