Plant and Human Physiology NDA Questions

NDA BIOLOGY

Plant and Human Physiology MCQ Questions


1.
Which vascular tissue in plants is primarily responsible for transport of water and minerals from roots to leaves?
A.
Phloem
B.
Cambium
C.
Cortex
D.
Xylem
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ANSWER :
D. Xylem
2.
The transport of organic solutes (sugars) from leaves to other parts of the plant occurs through:
A.
Phloem
B.
Endodermis
C.
Xylem
D.
Epidermis
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ANSWER :
A. Phloem
3.
The movement of water into the root hair cells from soil is primarily by:
A.
Imbibition
B.
Diffusion of ions
C.
Osmosis
D.
Active transport
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ANSWER :
C. Osmosis
4.
The apoplast pathway for water movement in roots refers to:
A.
Movement of water through cell walls and intercellular spaces without crossing membranes
B.
Movement through xylem vessels directly
C.
Movement through vacuoles only
D.
Movement through cytoplasm and plasmodesmata
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ANSWER :
A. Movement of water through cell walls and intercellular spaces without crossing membranes
5.
The Casparian strip, which forces water into the symplast pathway, is found in the:
A.
Pericycle of the root
B.
Cortex of the stem
C.
Epidermis of the leaf
D.
Endodermis of the root
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ANSWER :
D. Endodermis of the root
6.
Water potential (Ψ) of pure water at standard conditions is:
A.
Positive value
B.
+0.5 MPa
C.
Zero (0)
D.
-1 bar
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ANSWER :
C. Zero (0)