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51.

Which of the following statements if wrong about manganese toxicity?(a) Appearance of brown spots surrounded by chlorotic veins(b) Deficiency of Iron(c) Deficiency of Calcium(d) Excess of MagnesiumThe question was asked in semester exam.Asked question is from Mechanism of Absorption of Nutrients in section Mineral Nutrition of Biology – Class 11

Answer»

The correct ANSWER is (d) Excess of Magnesium

To explain I would say: Manganese toxicity is visible by appearance of BROWN SPOTS surrounded by CHLOROTIC veins. Also deficiency of iron, calcium and magnesium are symptoms of manganese toxicity as its excess concentration affects their functioning.
Discussion
52.

Which of the following roles is not a criterion for essentiality of an element?(a) In its absence, plants do not set seeds(b) Irreplaceable by another element(c) Indirectly involved in the metabolism of the plant(d) Absolutely necessary for metabolismI had been asked this question during an online interview.Enquiry is from Mineral Requirements of a Plant-2 topic in section Mineral Nutrition of Biology – Class 11

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Right choice is (c) Indirectly involved in the metabolism of the plant

To ELABORATE: The criteria of essentiality include:

i. The ELEMENT must be ABSOLUTELY necessary for supporting normal growth and reproduction. In the absence of the element, plants do not SET the seeds.

ii. The element must be directly involved in the metabolism of the plant.

iii. The element must not be replaceable by another element.
Discussion
53.

Which of the following macronutrients is used in fertilizers?(a) N(b) O(c) P(d) KThis question was posed to me in a national level competition.I'd like to ask this question from Mineral Requirements of a Plant-2 topic in portion Mineral Nutrition of Biology – Class 11

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Correct option is (d) K

Easiest explanation: NITROGEN, POTASSIUM and Phosphorus are IMPORTANT constituent of fertilizers. They are required in abundance by the plants. Oxygen is not USED in artificial fertilizers. They in fact INTERFERE with the process of nitrogen fixation carried out by cyanobacteria.
Discussion