The correct answer is Option D Upper oogonium and lower antheridium on the same plant.
This is because – The cleistogamous blooms do not open at all and generate a guaranteed seed set, therefore they are not pollinator-dependent.
Monoecious plant of Chara shows occurrence of
Option A Antheridiophore and archegoniophore on the same plant
Option B Stamen and carpel on the same plant
Option C Upper antheridium and lower oogonium on the same plant
Option D Upper oogonium and lower antheridium on the same plant
Option A Antheridiophore and archegoniophore on the same plant
Option B Stamen and carpel on the same plant
Option C Upper antheridium and lower oogonium on the same plant
Option D Upper oogonium and lower antheridium on the same plant
Monoecious plant of Chara shows occurrence of
Option A Antheridiophore and archegoniophore on the same plant
Option B Stamen and carpel on the same plant
Option C Upper antheridium and lower oogonium on the same plant
Option D Upper oogonium and lower antheridium on the same plant
Option A Antheridiophore and archegoniophore on the same plant
Option B Stamen and carpel on the same plant
Option C Upper antheridium and lower oogonium on the same plant
Option D Upper oogonium and lower antheridium on the same plant