Question

Aerenchyma is found in
A. Hydrophytes
B. Lithophytes
C. Sciophytes
D. Xerophytes

Answer 1

Hint:
Aerenchyma is considered to be the spongy tissue present in the plants. Aerenchyma is generally the modification of the parenchymatous cells. Most of the aerenchyma possesses the air-filled chamber. These help in providing buoyancy to float over the water surface.

Complete answer:
Hydrophytes are plants like lotus, Phytoplankton that have adapted to living in watery conditions. Aerenchyma is found in aquatic, marshes and plants. So the option A (hydrophytes) is correct.
Lithophytes that grow on rocks are also known as epipetric or epilithic plants. Examples: ferns, algae. So option B (lithophytes) is incorrect.
Sciophytes are shade-loving trees or plants. Sciophytes are also known as photophobic plants. Example: Oxalis. So the option C is incorrect.
Xerophytes are plants in xeric conditions. Popular examples of xerophytes are cacti, pineapple, and some Gymnosperm plants. So the option D (xerophytes) is incorrect.
Additional Information: Aerenchyma is found in hydrophytes. This tissue encloses air and provides buoyancy to the plant parts. So that these parts can Float in water. Examples are Hydrilla, Ceratophyllum, lotus, Eichhornia, Vallisneria. Aerenchyma is the modified form of parenchymatous tissues found in aquatic plants. The most important function of parenchyma tissue is to store air in its vacant space and provides buoyancy to the plant.

Hence, option A is correct.

Note: Aerenchyma seems to be the modification of parenchyma cells found in hydrophytes. The aerenchyma helps in the gaseous exchange among the heterophytes plants. Aerenchyma is modified parenchymatous cells, where the cells are arranged with regular air-filled spaces in between to facilitate diffusion of gases in and out. These are found in hydrophytes.