A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
The externally simple thallus of Riccia shows a more elaborate internal structure. It is many cells deeps. Thallus of Riccia has two distinct regions. (i) An upper or dorsal assimilatory or photosynthetic region. (ii) A lower or ventral storage region.
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