Question

Velamen tissue is found in
A. Mesophytes
B. Epiphytes
C. Hydrophytes
D. Xerophytes

Answer 1

Hint:Velamen tissue is generally found in aerial plants. Aerial plants get water by their roots & moisture from air. Most of them have some specialized leaves which also need some moisture, they are generally found in temperate zones.

Complete answer
A plant is made up of a number of tissues. Tissues are divided into two major categories, namely meristematic and permanent tissues, depending on whether or not the cells being produced are capable of dividing. Both plants and animal tissues are covered by a protective layer known as the epidermis. In plants, it is used to protect against water loss and mechanical damage.

In the given options,
>Mesophytes are the land plants that are adapted to survive throughout all seasons, and have no specific adaptations to deal with extreme cold or heat.
>Epiphytic plants are those known to grow on another plant or object but are not parasitic because they obtain their moisture and nutrients from the natural environment. Orchids have multiple-layer epidermis in roots called velamen, composed of non-living compressed cells with lignified strips of secondary walls. These cells provide food, reduce water loss, and allow the plant to absorb water.
>Hydrophytes are plants that grow in water bodies. They have specialised air chambers in their roots, stems and leaves that help them to remain afloat in water.
>Xerophytes are plants that are adapted to survive in areas with very little water. They have a waxy covering called cuticle on the epidermis that prevents the loss of water through transpiration. Xerophyte roots are well formed and can either be near to the surface of the soil or reach deep into the soil.

 Thus, the correct answer is option B i.e., Epiphytes.

Note: The roots of the orchid appear white when dry, and turn green when wet. This is because when the cells of the velamen absorb water, it becomes translucent, and reveals the green cortical cells.