Plant Kingdom Question 268
Question: Assertion : Sporogonium of Riccia is totally dependent on the gametophyte. Reason : Sporogonium of Marchantia is partly dependent on the gametophyte.
Options:
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
Show Answer
Answer:
Correct Answer: B
Solution:
Sporogonium of Riccia completely lacks chloroplasts.
Therefore, it is dependent upon the gametophyte for food, water and minerals.
However in Marchantia, with differentiation of the young sporophyte into foot, seta and capsule, the immature cells of the seta, capsule wall, elaters and even those of the foot develop chlorophyll.
They are autotrophic to a considerable extent.
It may be partly dependent upon the parent plant (gametophyte) for its food supply.
For the supply of water and minerals in solutions it is entirely dependent upon the parent plant.
BETA
