Q. No.Which of the following does not happen during nodule formation?
(1) Rhizobium bacteria contact a susceptible root hair, divide near it
(2) Successful infection of root hair causes it to curl
(3) Infected thread carries the bacteria to the inner cortex
(4) The bacteria get modified into rod shaped bacteroides and cause inner cortical and endodermal cells to divide
(1) Rhizobium bacteria contact a susceptible root hair, divide near it
(2) Successful infection of root hair causes it to curl
(3) Infected thread carries the bacteria to the inner cortex
(4) The bacteria get modified into rod shaped bacteroides and cause inner cortical and endodermal cells to divide
Nodule formation is a result of
(1) Division and growth of cortical cells
(2) Division and growth of pericycle cells
(3) Division and growth of endodermal cells
(4) Both A and B
Enzyme Nitrogenase is
(1) Highly sensitive to the molecular oxygen
(2) Least sensitive to the molecular oxygen
(3) Highly sensitive to carbon dioxide
(4) Least active enzyme
To protect nitrogenase from oxygen, which of the following in nodule will act as scavenger
(1) Leg-haemoglobin
(2) Anaerobic mode of life
(3) Both A and B
(4) Myoglobin
The nitrogen fixing bacteria are
(1) Always free living
(2) Generally free living aerobes but During nitrogen fixing event it becomes anaerobic
(3) Always anaerobic
(4) Generally anaerobic but under nitrogen fixing event, it becomes aerobic
The energy required, for the process of nitrogen metabolism comes from
(1) Respiration of the host cells
(2) Oxidation of the host cells
(3) Respiration of the bacterial cells
(4) Oxidation of the bacterial cells
Most of the plants can assimilate……a….. and ……b… and…c. is quite toxic to plants and hence cannot accumulate in them.
Find the correct one.
1. a. Ammonia
2. c. Ammonium ions
3. c. Nitrate
4. b. Nitrite
Ammonium is used to synthesise amino acids in plants which of the following is not a way?
(1) Reductive Amination
(2) Transamination
(3) Oxidative amination
(4) All of these
Reductive amination is
(1) Conversion of ammonia to alpha ketoglutarate and forms glutamate
(2) Ammonia reacts with alpha ketoglutarate and forms glutamate
(3) Ammonia reacts with glutamate and forms alpha-ketoglutaric acid
(4) Conversion of ammonia to glutamate
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