Question

which heavy metals are absorbed by plants and enter the food chain and indirectly due to acid rain​

Answer 1

Answer:

Mark me brainlest

Explanation:

Iron

Answer 2

Answer:

Explanation:

Heavy metals are absorbed by plants and enter the food chain and indirectly due to acid rain​:

The earth's crust naturally contains heavy metals, but careless human activity has significantly changed their geochemical cycles and biochemical equilibrium. As a result, metals accumulate in plant portions that contain secondary metabolites, which gives rise to a specific pharmacological activity. Humans may experience negative health impacts after being exposed to heavy metals like cadmium, copper, lead, nickel, and zinc for an extended period of time. Numerous biotechnological implications of molecular understanding of plant metal accumulation also exist, however their long-term impacts may not yet be established.

Any metal (or metalloid) species may be deemed a "contaminant" if it manifests itself in an unintended location or in a way or concentration that has a negative impact on people or the environment. Lead (Pb), cadmium (Cd), mercury (Hg), arsenic (As), chromium (Cr), copper (Cu), selenium (Se), nickel (Ni), silver (Ag), and zinc are among the metals and metalloids (Zn). Aluminum (Al), cesium (Cs), cobalt (Co), manganese (Mn), molybdenum (Mo), strontium (Sr), and uranium are additional, less frequent metallic pollutants (U).

In accordance with Indian Pharmacopoeia 2007 recommendations, the permitted limits for heavy metals in plant species are listed. According to research, Nitric Oxide (NO) regulates a number of plant responses to various abiotic and biotic stressors. First, NO indirectly scavenges Reactive Oxygen Species (ROS) caused by heavy metal stress in plants. It may also play a role in upping the antioxidant content and antioxidative enzyme activity in plants. Second, by influencing the elements of root cell walls, it may lead to an increase in the accumulation of heavy metals in root cell walls and a decrease in the accumulation of heavy metals in the soluble portion of plant leaves. Lastly, it might act as a signalling molecule in the chain of events that alters gene expression in response to heavy metal stressors.

In regions where acid rain has occurred, dead or dying trees are frequently seen. Aluminum is removed from the soil by acid rain. Both plants and animals may be harmed by that  Aluminium. The minerals and nutrients that trees require to develop are also taken out of the soil by acid rain.

Acidic fog and clouds may deplete nutrients from trees' foliage at high elevations, leaving them with brown or dead leaves and needles. The trees become weaker and less able to survive freezing conditions as a result of their decreased ability to absorb sunlight.

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