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because they have long stem .
A lotus plant adapts itself to live in water by developing leaves and stems that waxy in texture and essentially "hydrophobic." Lotus plants have achieved the hydrophobic effect.
Two adaptive features of lotus- Lotus leaves are wide and disc-shaped, which allows them to float on water. Their generous surface area allows them to absorb a large amount of sunlight.
tissues don't float because they absoarb water, so they sink.
duckweed is small and can float easily
they sink
boyancy
most probably, the weight of lotus must much smaller than its width or lets just say volume. and here buoyancy place an important role.
YES! The waxy coat of the water hyacinth leaves is waterproof and covers a spongy parenchyma tissue. Together with its swollen stem, which is filled with more spongy parenchyma tissue, it makes the plant float.
Kang kong plants, also known as water spinach, have air-filled hollow stems that provide buoyancy and allow them to float in the water. The air pockets in the stems keep the plant afloat, allowing it to grow and survive in aquatic environments. This floating adaptation helps the plant access sunlight and nutrients in the water for photosynthesis and growth.
Penis tissue is less dense than water, therefore a penis will float. Fun fact: breasts also float. also another answer..... life!
animals that live in water have alot of flubber to keep them warm, it also is very bouyant so it helps them float.