1.

    Which of the following bacteria is commonly involved in root nodule formation in leguminous plants?

    A

    Azotobacter

    B

    Nitrosomonas

    C

    Rhizobium

    D

    Clostridium

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Root Nodule Formation, Nitrogen Fixation, Bacteria, Symbiosis

    Related Questions

    1.

    For nitrogen fixation, useful pigment is

    A

    Nitrogenase

    B

    Haemoglobin

    C

    Myoglobin

    D

    Leghaemglobin

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Nitrogen fixation, pigments, leghaemoglobin

    2.

    The primary product of the nitrogenase-catalyzed reaction in the root nodules of leguminous plants is:

    A

    Ammonia

    B

    Nitrates

    C

    Nitrites

    D

    Dinitrogen

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    PYQ YEAR: 2020
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :nitrogen_fixation, nitrogen_cycle, symbiosis

    3.

    Root nodules in Alnus is formed by.

    A

    Rhizobium

    B

    Azospirillum

    C

    Frankia

    D

    Clostridium

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Nitrogen fixation, Root nodule formation, Actinobacteria

    4.

    Which one of the following is an amide involved in nitrogen assimilitaion by plants?

    A

    Glutamate

    B

    Alanine

    C

    Asparagine

    D

    Serine

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Amides, Nitrogen Assimilation, Amino Acids

    5.

    In root nodules of legumes, leghaemoglobin is important because it

    A

    Transports oxygen to the root nodule

    B

    Acts as an oxygen scavenger

    C

    Provides energy to the nitrogen fixing bacterium

    D

    Acts as a catalyst in transamination

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Leghaemoglobin, nitrogen fixation, root nodules

    6.

    The enzyme nitrogenase, found in the root nodules of leguminous plants, facilitates the production of which essential nutrient for plant growth?

    A

    Nitrite

    B

    Nitrate

    C

    Dinitrogen

    D

    Ammonia

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    PYQ YEAR: 2020
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :nitrogen_fixation, nitrogen_cycle, plant_nutrition

    7.

    A mutation in a legume plant prevents the formation of infection threads during rhizobial symbiosis. Which of the following processes would be MOST directly affected?

    A

    Recognition of the rhizobia by the root hairs

    B

    Curling of root hairs

    C

    Formation of the nodule meristem

    D

    Release of bacteria into the host cell cytoplasm

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Root Nodule Formation, Nitrogen Fixation, Plant-Microbe Interactions

    8.

    Which statement is TRUE regarding the protection of nitrogenase from oxygen?

    A

    Nitrogenase is insensitive to oxygen.

    B

    Oxygen promotes nitrogenase activity.

    C

    Leghaemoglobin binds with oxygen in root nodules.

    D

    Nitrogen fixation occurs best in aerobic conditions.

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    PYQ YEAR: 2015
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Biological Nitrogen Fixation, Nitrogenase, Oxygen Sensitivity, Leghaemoglobin

    9.

    During the process of root nodule formation, which of the following is the initial signal molecule released by the plant roots that attracts rhizobia?

    A

    Flavonoids

    B

    Nod factors

    C

    Lectins

    D

    Cytokinins

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Root Nodule Formation, Nitrogen Fixation, Plant Physiology

    10.

    Leg haemoglobin acts as?

    A

    Oxygen scavenger

    B

    N2{N_2} scavenger

    C

    Oxygen delivery agent

    D

    none of the above

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Leghemoglobin, Oxygen binding, Nitrogen fixation

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