Which one of the following elements in plants is not remobilized?
1. Calcium
2. Potassium
3. Zinc
4. Phosphorus
Manganese is required in
1. Nucleic acid synthesis
2. Plant cell wall formation
3. Photolysis of water during photosynthesis
4. Chlorophyll synthesis
Micronutrients are
1. less important than macronutrients
2. as important as macronutrients
3. having a minor role in plant nutrition
4. omitted from culture medium without any detrimental effect
Which of the following prevents inactivation of enzyme nitrogenase by oxygen poisoning, during biological nitrogen fixation?
1. Nod factors.
2. Leguminous haemoglobin.
3. Cytochrome.
4. Amides.
Which one of the following elements helps in photolysis of water and to maintain anion-cation balance in cells?
1. Boron.
2. Chlorine.
3. Manganese.
4. Both 2 and 3.
Select the correct set of non-mineral essential elements
1. C, Cl, N
2. C, H, B
3. C, H, O
4. H, O, Cl
Which set of elements become toxic when their concentration exceeds 10 mmol/kg of dry matter in
plants?
1. C, Mg, S
2. S, Mg, Fe
3. B, Zn, Cu
4. Mn, Mg, Ca
Match the column I of elements with their deficiency symptoms in plants in column II and then select the correct option.
Column I Column II
(Elements) (Deficiency symptoms)
A. Zn I. Plastid disintegration
B. Mn II. Accumulation of anthocyanin
C. S III. Grey spots in oats
D. K IV. Little leaf
1. A(IV), B(II), C(III), D(I)
2. A(I), B(II), C(III), D(IV)
3. A(II), B(I), C(IV), D(III)
4. A(IV), B(III), C(II), D(I)
Select the incorrect statement related to Mn toxicity
1. Prevention of binding of Mg with enzyme.
2. Promotion of Ca translocation to shoot apex.
3. Reduction in uptake of Mg.
4. Combined deficiency symptoms of Mg, Fe and Ca.
Nitrifying bacteria such as Nitrosomonas and Nitrobacter are
1. Heterotrophs.
2. Photoautotrophs.
3. Symbiotic.
4. Chemoautotrophs.
Nitrate assimilation is
1.
2.
3.
4.
Molybdenum (Mo) is more commonly found in
1. Roots
2. Stems
3. Leaves
4. Fruits
Ferrodoxin which is involved in electron transport, contains
1. Fe, S
2. Fe, Cu
3. Cu, S
4. S, K
During biological nitrogen fixation by Rhizobium 8-ATP is used for production of one . This ATP comes from
1. Respiration in cytoplasm of Rhizobium.
2. Respiration in host cell.
3. Both 1 and 2.
4. Depends on soil type.
Calcium is required for cell-wall formation but despite its presence in the medium plant fails to absorb and utilize calcium. This is due to deficiency of?
1. Cu
2. B
3. Zn
4. Mo