Which of the following statements is not correct?

Statement 4 is incorrect because DDT (Dichlorodiphenyltrichloroethane) is a persistent organic pollutant (POP) that causes water pollution rather than removing it. DDT is highly toxic, non-biodegradable, and undergoes biomagnification in food chains, leading to its ban in many countries. In contrast, other statements are scientifically valid. Increasing plant populations reduces atmospheric carbon dioxide through photosynthesis and sequestration . Leaf surfaces act as natural filters for particulate matter, including industrial soot, through a process called dry deposition [3]. Furthermore, certain aquatic plants like water hyacinth and duckweed flourish in nutrient-rich polluted waters and are utilized in phytoremediation to extract heavy metals and toxic compounds from the environment [2]. While mangroves and other vegetation act as sinks for contaminants, DDT remains a primary source of chemical pollution .

Sources

1. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 17: Contemporary Issues > 1. Air Pollution > p. 38
2. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > S r A z Genetic engineering approaches Ph propremediation > p. 100
3. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 4: Aquatic Ecosystem > 4.3. EUTROPHICATION > p. 36