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 Conducting tissues, especially xylem show greatest reduction in submerged hydrophytes. Reason Hydrophytes live in water so no need of tissues.A) extinction of these species from other regions
B) continental separation
C) absence of terrestrial route to these places
D) retrogressive evolution
Correct Answer: C
Solution :
Conducting tissues are very less developed in submerged hydrophytes because the whole plant body of these plants absorbs water and nutrients from external aquatic environment. In vascular tissues, particularly xylem, shows greatest reduction. In some cases, xylem elements are not at all developed.
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