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Zinc is essential for 
1. Biosynthesis of chlorophyll
2. Biosynthesis of auxin
3. Stomatal closing
4. Oxidation of carbohydrates 

Which of the following takes part in pollen germination?
1. Manganese
2. Zinc
3. Copper
4. Boron

'Plastocyanin' (PC) contains
1. Mo
2. Mn
3. Fe
4. Cu

Which of the following statement is not correct about nitrogen?
1. Plants competes with microbes for limited nitrogen present in soil.
2. Nitrogen is a limiting nutrient for both natural and agricultural ecosystems.
3. During nitrification chemihetrotrophic bacteria play vert important role.
4. Bacteria such as Pseudomonas and Thiobacillus and produce nitrogen gas from nitrate.

How many of the following statements is/are correct?
(1) Both Rhizobium and Frankia are free-living in soil and can fix ${\mathrm{N}}_2$ only under symbiotic condition.
(2) Root nodules can be best observed before flowering
(3) The formation of root nodules takes place as a result of the division of cortical and pericycle cells.
(4) When Rhizobium is free living it is aerobic but when it is symbiont it becomes anaerobic to protect Mo-Fe protein. Options :
(1) 4
(2) 3
(3) 2
(4) 1

How many of the statement(s) given below is/are correct about the fate of ammonia in plants?

1. 4
2. 3
3. 2
4. 1

Which of the following is not a criterion for an essential nutrient?
1. It is required for growth and reproduction
2. form large molecules in plants
3. No other element can replace it 
4. It is required for a specific structure or metabolic function

Hydrophonics has been successfully employed as a technique for the commercial production of vegetables like
1. Tomato
2. Seedless cucumber 
3. Lettuce
4. All are correct

The function of leghaemoglobin in the root nodules oflegumes is
1. oxygen removal
2. nodule differentiation
3. expression of nif gene

Nitrifying bacteria
1. convert free nitrogen to nitrogen compounds
2. convert proteins into ammonia
3. reduce nitrates to free nitrogen
4. oxidize ammonia to nitrates

The minerals involved in water-splitting reaction during photosynthesis are 
1. magnesium and chlorine
2. potassium and manganese
3. manganese and chlorine
4. molybdenum and manganese

Necrosis or death of tissue particularly leaf tissue particularly is due to the deficiency of
1. N, K and S
2. N, K, Mg and Fe
3. Mn, Zn and Mo
4. Ca, Mg, Cu and K

Older dying leaves export much of their mineral content to younger leaves. Similarly, what is incorrect:
1. Before leaf fall in deciduous plants, minerals are removed to other parts.
2. Elements most readily mobilized are phosphorus, nitrogen, and potassium.
3. Some elements that are structural components like calcium are not remobilized.
4. Deficiency symptoms of nitrogen are observed in younger parts.

Which of the following statement is not correct for toxicity of mineral nutrients ?
1. Toxicity is mainly associated with micro nutrients.
2. Toxicity level of any nutrient also varies for different plants.
3. Toxicity of one nutrient may inhibit uptake of another nutrient.
4. Symptom of toxicity cannot be due to deficiency of any other nutrient 

Which one of the following statements can best explain
the term critical concentration of an essential elements?
1. Essential elements concentration below which plant
growth is retarded 
2. Essential element concentration below which plant
growth becomes stunted.
3. Essential element concentration below which plant
4. None of these

Which of the following set does not contain all macronutrients?
1. Carbon, hydrogen, oxygen and nitrogen.
2. Phosphorous, sulphur, potassium and calcium
3. Magnesium, sulphur, potassium, and nitrogen.
4. Calcium, oxygen, manganese and sodium.

Which of the following is true about iron?
1. It is a constituent of ferrodoxin nd cytochrome.
2. It activates catalase enzyme
3. It is essential for formation of chlorophyll
4. All of these.

Which of the following statements is correct?
(a) The deficiency of any element can cause multiple symptoms.
(b) The same symptoms may be caused by the deficiency of one of several different elements.
(c) The concentration of the essential below which plant growth is retarded is termed as critical concentration.
(d) Chlorosis is the loss of chlorophyll due to the deficiency of N, K, Mg, Fe, S, Mn, Zn, and Mo.
(e) Different plants respond differently to the deficiency of the same element.
(1) All of these
(2) Only (a) and (d)
(3) Only (a) and (c)
(4) Only (c) and (d)

A mineral deficiency is likely to affect older leaves more
1. Mineral is a micronutrient.
2. Deficiency persists for a long time
3. Mineral is very mobile within the plant
4. Older leaves are in direct contact of sunlight.

Select the incorrect statement from the following:
(1) The amides - asparagine and glutamine are found in plants as a structural part of the protein.
(2) Amides contain less nitrogen than amino acids.
(3) ${\mathrm{NH}}_2$ radicles are transported to other parts via xylem.
(4) In soyabean, the fixed nitrogen is transported as ureides.

Enzyme nitrogenase is
1. Mo-Fe protein
2. Mo-Mn protein
3. Mn-Fe protein
4. Cu-Fe protein

Which of the following statements about the chemical
Process of${\mathrm{N}}_2$ fixation in cells is true?
1. It is enhanced by high ${\mathrm{O}}_2$ concentrations.
2. Very little energy in the form of ATP is needed
3. All three bonds between nitrogen atoms are broken simultaneously.
4. Hydrogen atoms are added to nitrogen to form ${\mathrm{NH}}_3$ molecules. 

Which one is false about the bacteria Rhizobium and Frankia?
(1) Both are nitrogen fixers.
(2) Both are free-living in soil but can live a symbiotic life with their respective partners.
(3) Frankia produces nodules on the roots of non-leguminous plants like Alnus, while Rhizobium does the same in leguminous plants.
(4) None of these.

Choose the wrong statement
(1) Nitrogen fixation needs anaerobic conditions.
(2) ATP that is used in nitrogen fixation comes from the respiration of host cells.
(3) Amides serve as protein precursors, key compounds for nitrogen transport, and storage.
(4) Amides have low nitrogen to carbon ratio.

All given statements are correct with respect to the fate of ammonia, except
(1) Glutamine and asparagine are the two most important amides in plants.
(2) $\mathrm{\alpha }$-ketoglutaric acid provides a carbon skeleton for the process of reductive amination process.
(3) Amides are transported through sieve tubes.
(4) Glutamic acids are the main amino acid that provides ${\mathrm{NH}}_2$ group during transamination process.