The correct option is (c).
Explanation
In vascular plants, the absorption of water and inorganic mineral nutrients is a fundamental physiological process carried out primarily by the root system. This process relies on specialized structures to maximize efficiency and ensure adequate transport to the shoot system.
Statement-wise Analysis
- Statement 1 is Incorrect. Plants absorb water and mineral nutrients primarily through their roots, not their leaves. While leaves are the site of photosynthesis and transpiration, the root system is specialized for anchoring the plant and absorbing resources from the soil. Foliar absorption (through leaves) can occur to a limited extent but is not the primary mechanism.
- Statement 2 is Correct. Root hairs are slender, unicellular elongations of the epidermal cells of the root. Their primary physiological function is to significantly increase the surface area of the root system. This expanded surface area enhances the rate and efficiency of water and mineral absorption from the surrounding soil.
- Statement 3 is Correct. Root hairs are delicate structures that penetrate the interstitial spaces between soil particles. They remain in direct contact with the thin film of water (capillary water) surrounding these particles, allowing for the uptake of water and dissolved minerals via diffusion and osmosis.
Key Takeaway: The primary organ for water and mineral absorption in plants is the root. Root hairs play a critical role by extending into soil pore spaces and vastly increasing the absorptive surface area.