In which of the following forms is iron absorbed by plants?
1. Ferric 2. Ferrous
3. Free element 4. Both ferric and ferrous
Subtopic:  Mineral Function |
 67%
From NCERT
NEET - 2018
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Which of the following elements is responsible for maintaining turgor in cells?
1. Magnesium
2. Sodium
3. Potassium
4. Calcium

Subtopic:  Mineral Function |
 83%
From NCERT
NEET - 2018
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Select the mismatch.

(1) Frankia                      Alnus

(2) Rhodospirillium            Mycorrhiza

(3) Anabaena                   Nitrogen fixer

(4) Rhizobium                 Alfa-fa

Subtopic:  Nitrogen Fixation |
 76%
From NCERT
NEET - 2017
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Which is essential for the growth of root tip?
(1) Zn

(2) Fe

(3) Ca

(4) Mn

Subtopic:  Criteria for Essentiality of Elements |
 56%
From NCERT
NEET - 2016
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In which of the following, all three are macronutrients?
(1) Iron, copper, molybdenum

(2) Molybdenum, magnesium, manganese

(3) Nitrogen, magnesium, phosphorus

(4) Boron, zinc, manganese

Subtopic:  Classification of Nutrients |
 85%
From NCERT
NEET - 2016
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