Question

Which of the below statements are true $\left(\right.T\left.\right)$ or false $\left(\right.F\left.\right)$ , and choose the correct option?
A. In the aquatic food chain, pesticides such as DDT are metabolised at a higher trophic level.
B. Metals that have the density of $75 \, g/cm^{3}$ are called heavy metals.
C. Minamata disease is developed due to Hg pollution in water.
D. FOAM is a term related to the oil spill pollution.

• A. $\left(\right.A-T\left.\right),\left(\right.B-F\left.\right),\left(\right.C-T\left.\right),\left(\right.D-F\left.\right)$
• B. $\left(\right.A-F\left.\right),\left(\right.B-T\left.\right),\left(\right.C-T\left.\right),\left(\right.D-F\left.\right)$
• C. $\left(\right.A-F\left.\right),\left(\right.B-F\left.\right),\left(\right.C-T\left.\right),\left(\right.D-F\left.\right)$
• D. $\left(\right.A-T\left.\right),\left(\right.B-T\left.\right),\left(\right.C-F\left.\right),\left(\right.D-F\left.\right)$

Answer 1

Answer: (B)

Pesticides such as DDT are nonbiodegradable, i.e., once they are absorbed by organisms, they cannot be metabolised and generally get accumulated in fat-containing tissues of the organisms.
The heavy metals refer to any metallic chemical element that has a relatively high density (75 g/cm³) and is toxic or poisonous at low concentrations. Examples of heavy metals include mercury (Hg), cadmium (Cd), arsenic (As), chromium (Cr), thallium (Tl) and lead (Pb).
Minamata disease is a neurological syndrome caused by severe mercury poisoning. Symptoms include ataxia, numbness in the hands and feet, general muscle weakness, narrowing of the field of vision, and damage to hearing and speech.
The Friends of the Arcata Marsh (FOAM) is a non-profit organization founded in 1987 by David R. Couch and eleven other community members to fund the Arcata Marsh Interpretive Center (AMIC). The purpose of the FOAM is to stimulate understanding of the Arcata Marsh Wildlife Sanctuary, its relationship with Arcata's integrated wastewater treatment system, the surrounding watersheds and bay, and their link with the earth's water cycle.