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(a) Moderate decrease of increase on m...

(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.

A

Only (a) is correct

B

Only (b) is correct

C

(b) & (c ) are correct

D

(a) & (c ) are correct

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The correct Answer is:
A
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Assertion :- Moderate decrease of micronutrients causes the deficiency symptoms and moderate increase causes toxicity. Reason:- There is a narrow range of concentration at which micronutrients are optimum.

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.

Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Acid rain is due to the increase in the concentration of . . . . . . . in the atmospheres

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.

AAKASH INSTITUTE-MINERAL NUTRITION-ASSIGNMENT (SECTION B)
  1. Mineral which is part of CoA, Fd, thiamine and lipoic acid is :

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  2. Huner signs in plants are

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  3. (a) Moderate decrease of increase on micronutrients causes deficie...

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  4. Movement of electrolytes through the roots is generally

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  5. Initial phase of ion uptake

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  6. The translocation of solute is

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  7. The process of conversion of 2 NO3 ^(- ) to 2 NO 3 ^(-) to...

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  8. Process of nitrification and nitrate assimilation are

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  9. Conversion of NO(3) to NO(2) to NH(4) is called and is catalysed by

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  10. Most common form of nitrogen uptake and usable forms for plant...

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  11. Which of the following is/are diazotrophs ?

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  12. Which is not true for nitrogenase enzyme in root nodules in legumes?

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  13. Leghemoglobin is found in which one of the following organisms ?

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  14. How many electron and protons are required to fix a dinitrogen ?

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  15. Cycas and Azolla plants are associated with

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  16. Select the correct statements from the given (a) Nitrogenae is ...

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  17. Nitrogenase enzyme found in root nodules in legumes contains

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  18. The amino acid which plays a central role in nitrogen metabolism ...

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  19. Transported and storage form of nitrogen in plants are

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  20. Ureides are preferred forms for storage and transport of nitrogen ...

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