Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion Mechanical tissues are absent or less developed in the floating and submerged parts of hydrophytic plants. Reason Generally, elongated and loosely arranged spongy cells are found in the body of submerged hydrophytic plants.A) extinction of these species from other regions
B) continental separation
C) absence of terrestrial route to these places
D) retrogressive evolution
Correct Answer: A
Solution :
Mechanical tissues are poorly developed or absent in floating or submerged hydrophytes because the buoyancy nature of water saves them from physical injuries. Generally, elongated and loosely arranged spongy cells are found in the plant body. These thin-walled cells, when turgid, provide mechanical support to the plants.
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