This question gives four statements about how flowers are arranged in different inflorescence types, and asks which one is wrong. Go through each one and check it against how that inflorescence actually opens its flowers.
- Hyphanthodium of ficus has irregularly arranged flowers: In the fig, tiny flowers line the inside wall of a hollow, flask shaped receptacle. Their placement is not a neat single row, so calling the arrangement irregular is an acceptable description, and this statement stands.
- Head inflorescence of sunflower has centrifugally arranged flowers: A sunflower head opens from the outside first. The oldest florets sit at the rim and the youngest are still closed at the center, which is a centripetal pattern, old to young from outside to inside. Calling it centrifugal reverses this, so this statement is wrong.
- Racemose inflorescence of Crotalaria has its flowers arranged in acropetal order: Crotalaria is a simple raceme, and in every raceme the oldest flowers sit lowest while new ones keep opening toward the tip. That is acropetal succession, so this statement is correct.
- Cymose of Jasmin has basipetally arranged flowers: Jasmine flowers in a cyme, where the main axis stops growing once it ends in a terminal flower, and lateral branches then open flowers below it. That is basipetal succession, so this statement is also correct.
Since three of the four statements match the real botanical pattern and only the sunflower one reverses centripetal into centrifugal, that is the incorrect statement.
Let's summarize:
- Racemose (Crotalaria): acropetal, old at base, young at tip.
- Cymose (Jasmine): basipetal, young at base.
- Sunflower head: centripetal, not centrifugal, which is why that statement is false.
So the incorrect statement is the one about the sunflower head inflorescence.