1.

    The enzyme nitrogenase is highly sensitive to oxygen. How do root nodules maintain a low oxygen environment necessary for nitrogen fixation?

    A

    Active transport of oxygen out of the nodule

    B

    Anaerobic respiration within the bacteroids

    C

    Leghemoglobin binds oxygen, buffering its concentration

    D

    Thick cell walls of the nodule prevent oxygen diffusion

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :1.5 mins
    🔄Ncert Concepts :Root Nodule Formation, Nitrogen Fixation, Leghemoglobin, Oxygen Regulation

    Related Questions

    1.

    Which of the following is the initial nitrogenous compound produced during nitrogen fixation in the root nodules of legumes?

    A

    Nitrate

    B

    Ammonia

    C

    Nitrite

    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

    2.

    VAM is

    A

    Ectomycorrhizae

    B

    Endomycorrhizae

    C

    Both (a) and (b)

    D

    Ectoendomycorrhizae

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Mycorrhizae, VAM, Ectomycorrhizae, Endomycorrhizae

    3.

    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

    4.

    Which of the following is NOT a direct consequence of Nod factor signaling in the host plant during root nodule formation?

    A

    Root hair curling

    B

    Formation of infection threads

    C

    Cortical cell division leading to nodule primordia formation

    D

    Expression of nif genes in bacteroids

    Question Tags
    📚 Subject:Botany
    📑 Chapter:Mineral Nutrition
    🎯Topic:Root Nodule Formation
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Root Nodule Formation, Nod Factors, Signal Transduction, Nitrogen Fixation

    5.

    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

    6.

    The sensitivity of nitrogenase to oxygen necessitates protective mechanisms. Which of the following is NOT a strategy employed by nitrogen-fixing organisms to protect nitrogenase?

    A

    Producing leghaemoglobin

    B

    Maintaining a high respiration rate

    C

    Forming specialized heterocysts

    D

    Performing photosynthesis in the same cells as nitrogen fixation

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

    7.

    Select the correct statement.

    A

    Legumes are incapable of fixing nitrogen

    B

    Legumes fix nitrogen through bacteria living in fruits

    C

    Legumes fix nitrogen only by bacteria present in root nodules

    D

    None of the above

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

    8.

    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

    9.

    The function of leghaemoglobin in the root nodules of legumes is

    A

    Oxygen removal

    B

    Nodule differentiation

    C

    Expression of nif gene

    D

    Inhibibition of nitrogenase activity

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

    10.

    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

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