2019-03-01 Biology Times

(singke) #1

Biology Times (^) March 19

  1. Which is essential for the growth of root tip?
    (NEET 2016)
    (a) Zn (b) Fe
    (c) Ca (d) Mn

  2. In which of the following all three are
    macronutrients? (NEET 2016)
    (a) Nitrogen, Nickle, Phosphorus
    (b) Boron, Zinc, Manganese
    (c) Iron, Copper, Molybdenum
    (d) Molybdenum, Magnesium, Manganese

  3. During biological nitrogen fixation, inactivation
    of nitrogenese by oxygen poisoning is prevented
    by: (AIMPT 2015)
    (a) Cytochrome (b) Leghaemoglobin
    (c) Xanthophyll (d) carotene

  4. Minerals known to be required in large amounts
    for plant growth include
    (AIMPT 2015)
    (a) Magnesium, Sulphur, Iron, Zinc
    (b) Phosphorus, Potassium, Sulphur, Calcium
    (c) Calcium, Magnesium, Manganese, Copper
    (d) Potassium, Phosphorus, Selenium, Boron

  5. Deficiency symptoms of nitrogen and potassium
    are visible first in (AIPMT 2014)
    (a) Senescent leaves (b)Young leaves
    (c) Roots (d) Buds

  6. Which of the following helps in absorption of
    phosphorus from soil by plants? (AIPMT 2011)

(a) Rhizobium (b) Frankia
(c) Anabaena (d) Glomus

  1. The function of leghaemoglobin in the root
    nodules of legume is. (AIPMT 2011)
    (a) Oxygen removal
    (b) Nodule differentiation
    (c) Expression of nif gene
    (d) Inhibition of nitrogenase activity

  2. Nitrifying bacteria (AIPMT2011)
    (a) Convert free nitrogen to nitrogen compounds
    (b) Convert proteins into ammonia
    (c) Reduce nitrate to nitrogen
    (d) Oxidise ammonia to nitrates

  3. Which one of the following elements in plants is
    not remobilised? (AIPMT 2011)
    (a) Calcium (b) Potassium
    (c) Sulphur (d) Phosphorus

  4. Which one of the following is not a
    micronutrient (AIPMT 2010,2003)
    (a) Molybdenum (b) Magnesium
    (c) Zinc (d) Boron

  5. The common nitrogen - fixers in paddy fields is
    (AIPMT 2010)
    (a) Rhizobium (b) Azospirillum
    (c) Oscillatoria (d) Frankia

  6. Manganese is required in (AIPMT 2009)
    (a) Nucleic acid synthesis
    (b) Plant cell wall formation

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