In plants, a common symptom caused by deficiency of P, K, Ca and Mg is the
  • bending of leaf tip
  • formation of anthocyanins
  • poor development of vasculature
  • appearance of dead necrotic tissue
Function of zinc is
  • Closing of stomata
  • Biosynthesis of 3-IAA
  • Synthesis of chlorophyll
  • Oxidation of carbohydrate
Which of the following is a group of micronutrients?
  • Ca, Zn, B
  • Fe, Mn, Cu
  • Cl, C, Ca
  • Ni, Mo, H
The process of conversion of NO
  • nitrification
  • ammonification
  • denitrification
  • nitrogen fixation
The formation of first stable product of nitrogen fixation is catalysed by enzyme
  • dehydrogenase
  • nitrogenase
  • isomerase
  • none of these
Manganese toxicity leads to deficiency of
  • iron
  • calcium
  • magnesium
  • all of the above
Chlorosis will occur if a plant is grown in
  • dark
  • shade
  • strong light
  • Fe – free medium
Choose the correct function of magnesium.
  • It is a constituent of several coenzyme.
  • It activates the enzymes of respiration and photosynthesis.
  • It activates enzyme catalase.
  • It helps in maintaining anion-cation balance.
Mineral salts which are absorbed by the roots from soil are in the form of
  • Dilute solution
  • Very concentrated solution
  • Concentrated solution
  • Very dilute solution
Which one of the following mineral elements plays an in biological nitrogen fixation?
  • Copper
  • Manganese
  • Zinc
  • Molybdenum
Oxygen scavangers present in root nodules of legumes is
  • haemoglobin
  • leg haemoglobin
  • cyano haemoglobin
  • none of these
Which one of the following is not a micronutrient?
  • Magnesium
  • Molybdenum
  • Boron
  • Zinc
Which of the following is not a macronutrient
  • iron
  • calcium
  • manganese
  • phosphorus
Insectivorous plants grow where
  • There is carbohydrate deficient soil
  • There is nitrogen deficient soil
  • Vitamin c is required
  • Hormones are required
Phytotron is meant for
  • Controlled humidity
  • Induction of mutations
  • Controlled irradiation
  • Growing plants under controlled environment
Toxicity of which element leads to the appearance of brown spots on leaves
  • Mg
  • Mn
  • Fe
  • Cu
Presence of phosphorus
  • brings about healthy root growth
  • promotes fruit ripening
  • retards protein formation
  • none
Which element is required for opening and closing of stomata?
  • P
  • K
  • Ca
  • Na
Exanthema is due to deficiency of
  • B
  • Mo
  • Mn
  • Cu
NPK denotes
  • Nitrogen, Protein, Kinetin
  • Nitrogen, Protein, Potassium
  • Nitrogen, Potassium, kinetin
  • Nitrogen, Phosphorus, Potassium
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