Page 31 - Science class 4
P. 31
DIFFERENT TYPES OF AQUATIC PLANTS
Free-floating Plants
± These plants are not rooted to the soil.
± They are very light and float on the surface of water.
± Some common examples are water lettuce and duckweed .
± These plants use sunlight and carbon dioxide from the air to
make food.
± They protect small water animals from the hot Sun.
Underwater Plants Pondweed
± These are the plants that live underwater.
± Their roots are fixed to the soil or to the bottom of shallow
ponds and rivers.
Water lily ± Tape grass and pondweed are the common examples of
underwater plants.
± Their narrow leaves have no stomata at all.
± These plants breathe through their body surface. These
plants clean the water by removing carbon dioxide given
Lotus out by the aquatic animals.
± We also put such plants in an aquarium .
Fixed Plants
± These plants have their roots fixed in the bottom of the pond.
± Water lily and lotus are the common examples.
± Their long, hollow stems support the large leaves and flowers
that float on the surface of the water.
± These plants have stomata only on the upper surface so that
water does not block the pores.
± The broad leaves of such plants provide a nesting place for
some tiny organisms. Cattail
Emergent Plants
± They line the edge of the water body where the soil is
soaked in water.
± They look like land plants.
Iris ± Cattail and iris are the common examples.
