Q.1
The most abundant element found in plants is ... ...[ CBSE 2004]
  • a) Carbon
  • b) Nitrogen
  • c) Iron
  • d) Manganese
Q.2
Which element is required for germination of pollen grain .... .... [ Guj. CET 2007]
  • a) Calcium
  • b) Chlorine
  • c) Potassium
  • d) Boron
Q.3
Nitrite is changed to nitrate by ... ...[ CPMT 2007]
  • a) Nitrobacter
  • b) Nitrosomonas
  • c) Pseudomonas
  • d) Clostridium
Q.4
Passive absorption of minerals depends upon ... ..... [ CBSE 2001]
  • a) Humidity
  • b) Temperature
  • c) Temperature and metabolic inhibitor
  • d) Metabolic inhibitor
Q.5
Yellowish edges appears in leaves deficient in ... .. [ kerala 2004]
  • a) Ca2+
  • b) Mg2+
  • c) K+
  • d) Sulphur
Q.6
Enzyme catalysed reactions can be inhibited by ... ...[ AMU 1997]
  • a) Mg2+
  • b) Cu2+
  • c) Hg2+
  • d) Zn2+
Q.7
In plants chlorosis is caused by the deficiency of ... .... [ JKCMEE 2010]
  • a) Nitrogen
  • b) Manganese
  • c) Magnesium
  • d) All the above
Q.8
Mineral absorption is mostly ... .... [ Har PMT 1994]
  • a) Physical process
  • b) Chemical process
  • c) Active process
  • d) Passive process
Q.9
Enzyme nitrogenase is required for ... ...[ JKCMEE 2007]
  • a) Nitrification
  • b) Nitrite reduction
  • c) Nitrate reduction
  • d) Nitrogen fixation
Q.10
Phosphorus brings about ... .... [ CPMT 1991]
  • a) Retardation of protein synthesis
  • b) Healthy root growth
  • c) Fruit ripening
  • d) Retarded plant growth
Q.11
Which one does not fix nitrogen ... ...[ Har PMT 2003 ]
  • a) Azotobacter
  • b) Spirogyra
  • c) Anabaena
  • d) Nostoc
Q.12
Which of the following is present in the core of chlorophyll molecules? ... ... [ CBSE 2003]
  • a) Fe
  • b) Mg
  • c) K
  • d) Mn
Q.13
Which option shows correct correlation in columns ....[Guj CET 2008]
a) Calcium I) Required for ionic balance i) Grey bolt on leaves
b) Boron II) Essential for constitution of nucleic acid ii) Fruit yield decreases
c) Phosphorus III) Required for absorption of Ca iii) Red blot on leaves
d) Chlorine IV) Required to activate respiratory enzymes iv) Fruit size diminishes
e) Manganese V) Required for synthesis of bipolar spindle v) Young root tips begin to die
  • a) a-V-v, B-III-iv, c-II-iii, d-I-ii, e-IV-i
  • b) a-I-iv, b-II-v, c-III-iii, d-IV-i, e-V-ii
  • c) a-V-v, b-IV-iv, c-III-i, d -II-iii, e-I-ii
  • d) a-I-iii, b-I-iv, c-V-v, d-III-ii, e-II-i
Q.14
Plants require sulphur for .... .... [ DPMT 2001]
  • a) ATP synthesis
  • b) Protein synthesis
  • c) Glucose synthesis
  • d) DNA replication
Q.15
Farmers of a particular region are concerned that premature yellowing of leaves of pulse crop might cause decrease in the yield. Which treatment could be beneficial to obtain maximum seed yield? ... ..[ AIIMS 2007]
  • a) Application of iron and magnesium to promote chlorophyll synthesis
  • b) Frequency irrigation of crop
  • c) Treatment of plants with cytokinins along with a small dose of nitrogen fertilizer
  • d) Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-T
Q.16
Clay and organic matter of the soil have negative charges. They attract positively charged ions like ... ...[ AFMC 1999 [
  • a) Ca2+
  • b) Mg2+
  • c) K+
  • d) All the above
Q.17
If the size of fruits diminishes in plants, which mineral ion should be added to soil ... .... [ Guj CET 2006]
  • a) Calcium
  • b) Chlorine
  • c) Copper
  • d) Boron
Q.18
Which one group is of micro-elements? ... ... [ MPPMT 1995]
  • a) Mn, Cu, Ca
  • b) Na, K, B
  • c) Na, Ni, Cl
  • d) Cu, Mo, Zn, Fe
Q.19
A nitrogen fixing fungus is ... ...... Explanation is provided please click on
  • a) Albugo
  • b) Pullularia
  • c) Amanita
  • d) Pleurotus
Q.20
A fertilizer has a formula of three figures 15-9-They stand for percentage of ... ....
  • a) N, Ca and Mg
  • b) Mg, P and K
  • c) Ca, N nad Fe
  • d) N, P and K
Q.21
Which one is wrong combination ... ... [ kerala 2000 ]
  • a) N2 - Amino acid
  • b) Fe-cytochrome
  • c) Na-Protein
  • d) Mg-Chlorophyll
Q.22
The macronutrient which is essential component of all organic compounds but is not obtained by plants from soil is .... ...[ KCET 2005]
  • a) Nitrogen
  • b) Phosphorus
  • c) Magnesium
  • d) Carbon
Q.23
Nitrogen absorbed by plants is ... ... [ AMU 1999 ]
  • a) Converted to nitrate
  • b) Reduced to ammonia
  • c) Changed to nitrite
  • d) Combined with oxygen
Q.24
Match the column ... ... [ kerala 2006]
a) Potassium Constituent of ferredoxin
b) Sulphur Involved in stomatal movement
c) Molybdenum Needed in synthesis of auxin
d) Zinc Component of nitrogenase
  • a) a - 2, b -1, c - 4, d - 3
  • b) a - 1, b - 2, c - 3, d - 4
  • c) a - 4, b - 3, c - 2, d - 1
  • d) a - 1, b - 3, c - 4, d - 2
Q.25
Which is not a microelement? .... ... [ RPMT 1996]
  • a) Cu
  • b) Mn
  • c) Bo
  • d) Ca
Q.26
N2 + 8e- + 8H+ +16ATP → 2NH4 + H2 +16 ADP + 16Pi The above equation refers to ... ...[kerala 2007]
  • a) Ammonification
  • b) Nitrification
  • c) Nitrogen fixation
  • d) Denitrification
Q.27
Amino acids are mostly synthesised from ... ..... [ CBSE 1992]
  • a) Mineral salts
  • b) fatty acids
  • c) Volatile acids
  • d) α- ketoglutaric acid
Q.28
The pigment protein present in nodulated roots inhabited by Rhizobium is ... ... [ Har PMT 2003]
  • a) Nitrate reductase
  • b) Hydrogenase
  • c) Leghaemoglobin
  • d) Plastocyanin
Q.29
Which is not an essential element for plants ... ... [ AMU 2011]
  • a) Iron
  • b) Potassium
  • c) Zinc
  • d) Na/Ba/Cd/Al
Q.30
Which is correctly matched .... .... [ CBSE 2012]
  • a) Passive transport - ATP
  • b) Apoplast - Plasmodesmata
  • c) Potassium - Readily immobilisation
  • d) Bakane of Rice seedling - F. Skoog
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