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Toxicicity of manganese in aplant result...

Toxicicity of manganese in aplant result in a. Brown spot surrounded by chlorotic venis, b. Increases in uptake of Fe, c. Inhabition of Ca translocation in shoot apex

A

Only a

B

Both a and b

C

Only c

D

Both a and c

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A plant exhibits the appearance of brown spots surrounding by chlorotic veins. When inspected in more detail , it is observed that its calcium translocation to the shoot is also disrupted. The plant is showing toxicity of

Assertion: The prominent symptom of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins. Reason: Excess of maganese may induce deficiencies of iron, magnesium and calcium.

State true or false : (i) In the initial phase of absorbation of elements the ions are absorbed passively. (ii) Deficiency of manganese leads to inhibition of Ca translocation to shoot apex.

Assertion :- Excess of Mn may induce deficiency of Fe, Mg & Ca. Reason:- Excess of Mn compete with uptake of Fe & Mg and inhibit translocation of Ca to shoot apex.

A : Maganese toxicity cause brown spots ,chlorotic veins and inhibintion of calcium translocation to shoot apex. R : Toxic effects may be due to direct excess of micronutrients or its interference in the absorbtion and functioning of other nutrients.

The force of interaction between the molecules of same substance is called cohesive force hile force of interaction between molecules of different substances is called adhesive force . Both the forces are attracive and have a range of about 10 A . If we consider a molecule . A well inside a liquid we find that it is equally attracted by the surrounding molecules in all the directions ( with a sphere of radius 10 Å ) and so it does not experience any resultant force . On or near the surface of a liquid , the molecules do not exist on the free side and so a molecule ( say B ) experiences a resultant force vertically downwards into the liquid . For this reason , the molecules of the surface have a tendency to go into the liquid . Thus , the surface tends to contract and gives rise to surface tension . As surface molecules like B experience a net downward force of cohension and have tendency to go down , so in increasing the area of the surface more molecules are to be shifted to the surface from inside . Thus , more mechnical work will have to be done against the net downward force of cohension . This work is stored by the molecules in the surfaces as potential energy called free surface energy . Furthermore , molcules like P , in contact with the liquid will stick to the solid surface , i.e will meet it if the force of adhesion A is greater than net force of cohension C . The liquid will not the solid surface if C gt A Also , molecules like Q at the surface in contact with the solid will experience a net force of cohension C_(R) . If adhesion A is greater then cohension C_(R) , the resultant force will be F . As the liquid can't support tangential force , F must be perpendicular to the surface of the liquid . So , the menisus will be concave and the angle of contact will be acute ( gt 90^(@)) . However , if adhesion is lesser than cohension , the resultant force F will be directed into the liquid and so the menisus ( which is perpendicular to F as liquid support tangential force ) will be convex and the angle of contact will be obtuse ( gt 90^(@)) A liquid particle B , which is present in the vicinity particle A can exert a force on A if the distance of B from A is

The force of interaction between the molecules of same substance is called cohesive force hile force of interaction between molecules of different substances is called adhesive force . Both the forces are attracive and have a range of about 10 A . If we consider a molecule . A well inside a liquid we find that it is equally attracted by the surrounding molecules in all the dirctions ( with a sphere of radius 10 Å ) and so it does not experience any resultant force . On or near the surface of a liquid , the molecules do not exist on the free side and so a molecule ( say B ) experiences a resultant force vertically downwards into the liquid . For this reason , the molecules of the surface have a tendency to go into the liquid . Thus , the surface tends to contract and gives rise to surface tension . As surface molecules like B experience a net downward force of cohension and have tendency to go down , so in increasing the area of the surface more molecules are to be shifted to the surface from inside . Thus , more mechnical work will have to be done against the net downward force of cohension . This work is stored by the molecules in the surfaces as potential energy called free surface energy . Furthermore , molcules like P , in contact with the liquid will stick to the solid surface , i.e will meet it if the force of adhesion A is greater than net force of cohension C . The liquid will not the solid surface if C gt A Also , molecules like Q at the surface in contact with the solid will experience a net force of cohension C_(R) . If adhesion A is greater then cohension C_(R) , the resultant force will be F . As the liquid can't support tangential force , F must be perpendicular to the surface of the liquid . So , the menisus will be concave and the angle of contact will be acute ( gt 90^(@)) . However , if adhesion is lesser than cohension , the resultant force F will be directed into the liquid and so the menisus ( which is perpendicular to F as liquid support tangential force ) will be convex and the angle of contact will be obtuse ( gt 90^(@)) The free suface energy , stored in the surface is because of work done

(a) Moderate decrease of increase on micronutrients causes deficiency and toxicaity symptoms respectively. (b) Excess of manganese causes toxicity of iron calcium and molybdenum. (c ) A macronutrients said to be toxic when present below a critical concentration.

AAKASH INSTITUTE-TEST 5-EXAMPLE
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  2. Chosse the odd one w.r.t the elements which help in maintainig cation-...

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  3. Toxicicity of manganese in aplant result in a. Brown spot surrounded b...

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  4. Movement of ions into synplast area of a plant cell

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