Question

_________ plants adapt to desert environment by developing long tap root system which penetrates long and deep enough to reach source of water.

• A. Xerophytes
• B. Phreatophytes
• C. Halophytes
• D. Pteridophytes

Hint:

The term 'Phreatophyte' comes from the Greek roots 'phrear' (meaning a well) and 'phyton' (meaning a plant). Phreatophytes literally act as 'well plants' by tapping directly into groundwater resources.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Desert plants develop diverse morphological and physiological adaptations to survive extreme water scarcity.
These adaptations are classified into distinct categories depending on how the plants manage water uptake, storage, and conservation.

Step 2: Detailed Explanation:
Let us examine the definitions of the options provided:
1. Xerophytes is a broad, umbrella term for all plants adapted to dry habitats.
2. Phreatophytes are a highly specialized subgroup of desert plants that adapt by growing extremely deep taproot systems. These roots extend downward through dry sand and rock layers until they reach the phreatic zone (the water table or the capillary fringe immediately above it). This allows them to maintain a continuous, year-round water supply independent of immediate rainfall. Classic examples include *Prosopis juliflora* and *Tamarix* species.
3. Halophytes are plants adapted to highly saline soils.
4. Pteridophytes are primitive, non-flowering vascular plants like ferns that typically require humid, shady conditions for survival and reproduction.
Therefore, the specific group described by the long, deep-penetrating taproot system reaching groundwater reserves is the phreatophytes.

Step 3: Final Answer:
The plants described are Phreatophytes, corresponding to option (B).