What will happen when water and pebbles and pour it on the other cup?

The water level in the bucket would drop.

This is because the pebbles have a greater density than water - they displace more water (when floating in a cup), than their volume. Thus the water displaced by the cup of floating pebbles has to be more than the volume of pebbles in the cup.

answer; i believe the correct answer is (sporophyte);