Mineral Toxicity MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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6 Questions around this concept.
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EASYWhich one of the following symptoms is not due to manganese toxicity in plants?
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Mineral Toxicity
- The following graph demonstrates how deficiency of any macroelement or microelement reduces growth.
- As the mineral availability is increased, growth increases.
- As the mineral content continues to be increased there is not much further increase in growth, but other qualities of the plant may be continuing to increase.
- This zone is called the luxury consumption zone.
- However, continuing to increase the mineral concentration ultimately reaches toxic levels and growth is diminished.
- The mineral ion concentration at which the dry weight of tissue is reduced by 10% is called its toxic concentration.
- Toxic concentration is different for different micronutrients. It varies from plant to plant.
- Manganese is toxic beyond 600 microgram/gram for soybean but for sunflower, it is toxic beyond 5300 microgram/gram.
- Toxicity of one mineral may induce a deficiency of other minerals. For example, deficiency of Mn causes deficiency of Fe, Mg and Ca.
- The prominent symptom of Mn toxicity is brown spots surrounded by chlorotic veins.
- Due to the toxicity of Mn following effects are seen
- Reduction in the uptake of Mg and Fe
- Prevention of binding of Mg with enzymes
- Inhibition of Ca translocation to shoot apex
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