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Biotechnology Objective Questions { Transport of Molecules in Plant }



1. A widely accepted explanation for transport of sugar in phloem is called
A.root pressure theory
B.transpiration
C.pressure flow hypothesis
D.cytoplasmic streaming
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2. Phloem is composed of
A.vessel elements and companion cells
B.tracheids and vessel elements
C.sieve-tube elements and companion cells
D.tracheids and sieve-tube elements
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3. The movement of most minerals, including potassium into root cells is by
A.osmosis
B.diffusion
C.bulk flow
D.active transport
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4. The evaporation of water from leaves is called
A.transpiration
B.cohesion
C.tension
D.pressure flow
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5. Normally CO2 and O2 enter a plant by
A.osmosis
B.active transport
C.diffusion
D.evaporation
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6. The cohesion-tension theory of water movement helps to explain how water moves from soil into root?
A.Through the phloem
B.From leaf to root
C.Through the xylem
D.Into the guard cells
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7. When guard cells swell
A.stomata close
B.stomata open
C.photosynthesis stops
D.evaporation stops
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