The function of leghaemoglobin in the root nodules of legumes is:
[A] Oxygen removal
[B] Nodule differentiation
[C] Expression of nif gene
[D] Inhibition of nitrogenase activity
[A] Convert free nitrogen to nitrogen compounds
[B] Convert proteins into ammonia
[C] Reduce nitrates to free nitrogen
[D] Oxidize ammonia to nitrates
Which one of the following elements in plants is not remobilised?
An organism used as a bio fertilizer for raising soyabean crop is:
For its action, nitrogenase requires:
[C] Super oxygen radicals
[D] High input of energy
For its activity, carboxypeptidases requires:
Read the following four statements (A-D):
(A) Both, photo phosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane
(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth
(C) Stamens in flowers of Gloriosa and Petunia are polyandrous
(D) Symbiotic nitrogen-fixers occur in free- living state also in soil
How many of the above statements are right
Best defined function of Manganese in green plants is:
[A] Photolysis of water
[B] Calvin cycle
[C] Nitrogen fixation
[D] Water absorption
Which one of the following is wrong statement?
[A] Anabaena and Nostoc are capable of fixing nitrogen in free-living state also.
[B] Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
[C] Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins
[D] Nitrosomonas and Nitrobacter are chemoautotrophs
The most abundant intracellular cation is:
The first stable product of fixation of atmospheric nitrogen in leguminous plants is:
[A] NO– 2
[C] NO – 3
Deficiency symptoms of nitrogen and potassium are visible first in:
[A] Senescent leaves
[B] Young leaves
A few normal seedlings of tomato were kept in a darkroom. After a few days they were found to have become white coloured like albinos. Which of the following terms will you use to describe them?
Mineral known to be required in large amounts for plant growth include:
[A] Phosphorus, potassium, sulphur, calcium
[B] Calcium, magnesium, manganese, copper
[C] Potassium, phosphorus, selenium, boron
[D] Magnesium, sulphur, iron, zinc
Which one gives the most valid and recent explanation for stomatal movements?
[B] Potassium influx and efflux
[C] Starch hydrolysis
[D] Guard cell photosynthesis
The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
[A] Manganese and Potassium
[B] Magnesium and Molybdenum
[C] Magnesium and Chlorine
[D] Manganese and Chlorine
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by: