Q1. In plants, a common symptom caused by deficiency of P, K, Ca and Mg is the

• A) bending of leaf tip
• B) formation of anthocyanins
• C) poor development of vasculature
• D) appearance of dead necrotic tissue

Q2. Function of zinc is

• A) Closing of stomata
• B) Biosynthesis of 3-IAA
• C) Synthesis of chlorophyll
• D) Oxidation of carbohydrate

Q3. Which of the following is a group of micronutrients?

• A) Ca, Zn, B
• B) Fe, Mn, Cu
• C) Cl, C, Ca
• D) Ni, Mo, H

Q4. The process of conversion of NO2– to N2 is called

• A) nitrification
• B) ammonification
• C) denitrification
• D) nitrogen fixation

Q5. The formation of first stable product of nitrogen fixation is catalysed by enzyme

• A) dehydrogenase
• B) nitrogenase
• C) isomerase
• D) none of these

Q6. Manganese toxicity leads to deficiency of

• A) iron
• B) calcium
• C) magnesium
• D) all of the above

Q7. Chlorosis will occur if a plant is grown in

• A) dark
• B) shade
• C) strong light
• D) Fe – free medium

Q8. Choose the correct function of magnesium

• A) It is a constituent of several coenzyme
• B) It activates the enzymes of respiration and photosynthesis.
• C) It activates enzyme catalase
• D) It helps in maintaining anion-cation balance

Q9. Mineral salts which are absorbed by the roots from soil are in the form of

• A) Dilute solution
• B) Very concentrated solution
• C) Concentrated solution
• D) Very dilute solution

Q10. Which one of the following mineral elements plays an in biological nitrogen fixation?

• A) Copper
• B) Manganese
• C) Zinc
• D) Molybdenum

Q11. Oxygen scavangers present in root nodules of legumes is

• A) haemoglobin
• B) leg haemoglobin
• C) cyano haemoglobin
• D) none of these

Q12. Which one of the following is not a micronutrient?

• A) Magnesium
• B) Molybdenum
• C) Boron
• D) Zinc

Q13. Which of the following is not a macronutrient

• A) iron
• B) calcium
• C) manganese
• D) phosphorus

Q14. Insectivorous plants grow where

• A) There is carbohydrate deficient soil
• B) There is nitrogen deficient soil
• C) Vitamin c is required
• D) Hormones are required

Q15. Phytotron is meant for

• A) Controlled humidity
• B) Induction of mutations
• C) Controlled irradiation
• D) Growing plants under controlled environment

Q16. Toxicity of which element leads to the appearance of brown spots on leaves

• A) Mg
• B) Mn
• C) Fe
• D) Cu

Q17. Presence of phosphorus

• A) brings about healthy root growth
• B) promotes fruit ripening
• C) retards protein formation
• D) none

Q18. Which element is required for opening and closing of stomata?

• A) P
• B) K
• C) Ca
• D) Na

Q19. Exanthema is due to deficiency of

• A) B
• B) Mo
• C) Mn
• D) Cu

Q20. NPK denotes

• A) Nitrogen, Protein, Kinetin
• B) Nitrogen, Protein, Potassium
• C) Nitrogen, Potassium, kinetin
• D) Nitrogen, Phosphorus, Potassium

Q21. The nitrogen exists as two nitrogen atoms joined by

• A) Di covalent bonds
• B) tetra covalent bonds
• C) triple covalent bonds
• D) monocovalent bond

Q22. Biological nitrogen fixation was discovered by

• A) Gericke
• B) Nehar and Sakmann
• C) Liebig
• D) Winograndsky

Q23. The enzyme involved in biological nitrogen fixation are

• A) Carboxylase
• B) Oxygenase
• C) Dehydrogenase
• D) Nitrogenase

Q24. The requirement of micro nutrient are always low if the concentration increases it leads to

• A) deficiency symptoms
• B) Cell differentiation
• C) toxicity
• D) Cell elongation

Q25. Analysis of xylem sap shows

• A) presence of enzymes
• B) presence of organic matter
• C) presence of nutrients
• D) presence of mineral salts