Correct option is D
Explanation-
A. Excluders - IV: Can restrict heavy metal ions to the roots and detoxify them.
These plants restrict uptake or limit translocation of heavy metals to aerial parts. They often detoxify heavy metals in the roots.
B. Heavy metal protein transporter - III: Transgenesis
These are engineered or natural proteins used in genetic engineering (transgenesis) to enhance metal uptake/detoxification.
C. Hyperaccumulators - I: Can absorb and transfer heavy metals to aerial parts without phytotoxicity symptoms
These plants can absorb and tolerate heavy metals, moving them to aerial parts without toxicity.
D. High biomass, non-accumulators - II: Salix sp. and Populus sp.
These plants (e.g., Salix, Populus) produce high biomass but don't naturally accumulate metals well. It is useful for phytoextraction when engineered or used with chelators.
Correct Answer: Option d - A - IV, B - III, C - I, D - II
