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Mineral Nutrition · Question 14

NEET 2016 (Phase 2)MCQEasy📈 Topic in 25% papers+4−1
1

Which is essential for the growth of root tip?

  1. Zn
  2. Fe
  3. Ca
  4. Mn

Answer

(3) Ca

Solution

As per NCERT, calcium is required by meristematic and differentiating tissues. During cell division it is used in the synthesis of the cell wall, particularly as calcium pectate in the middle lamella, and it is also needed during the formation of the mitotic spindle.

The root tip is a region of active cell division (root apical meristem),

calcium is essential for its growth; its deficiency causes death of root tips.

Answer: (3)

Out of syllabusNEET 2016 (Phase 2)

Keep practising — Mineral Nutrition

2

The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

  1. Magnesium and Molybdenum
  2. Magnesium and Chlorine
  3. Manganese and chlorine
  4. Manganese and Potassium
Out of syllabusAIPMT 2015
3

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

  1. carotene
  2. cytochrome
  3. leghaemoglobin
  4. xanthophyll.
Out of syllabusAIPMT 2015
4

Minerals known to be required in large amounts for plant growth include

  1. potassium, phosphorus, selenium, boron
  2. magnesium, sulphur, iron, zinc
  3. phosphorus, potassium, sulphur, calcium
  4. calcium, magnesium, manganese, copper.
Out of syllabusAIPMT 2015 (Cancelled)
5

Deficiency symptoms of nitrogen and potassium are visible first in

  1. senescent leaves
  2. young leaves
  3. roots
  4. buds.
Out of syllabusAIPMT 2014
6

The first stable product of fixation of atmospheric nitrogen in leguminous plants is

  1. NO3-
  2. glutamate
  3. NO2-
  4. ammonia.
Out of syllabusNEET 2013
7

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere ?

  1. Anaerobic ammonium oxidation, and denitrification
  2. Aerobic nitrate oxidation, and nitrite reduction
  3. Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes
  4. Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds
NEET 2013 (Karnataka)
8

Which of the following elements is a constituent of biotin?

  1. Magnesium
  2. Calcium
  3. Phosphorus
  4. Sulphur
Out of syllabusNEET 2013 (Karnataka)
9

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere?

  1. Aerobic nitrate oxidation and nitrate reduction
  2. Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds
  3. Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes
  4. Anaerobic ammonium oxidation and denitrification
Out of syllabusNEET 2013 (Karnataka)
10

For its action, nitrogenase requires

  1. high input of energy
  2. light
  3. Mn2+
  4. super oxygen radicals
Out of syllabusAIPMT 2012 (Mains)
11

Which one of the following is wrong statement?

  1. Anabaena and Nostoc are capable of fixing nitrogen in free-living state also.
  2. Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
  3. Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.
  4. Nitrosomonas and Nitrobacter are chemo-autotrophs.
AIPMT 2012 (Prelims)

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