CBSE
The first stable product of fixation of atmospheric nitrogen in the leguminous plant is
NO2-
ammonia
NO3-
glutamate
Macromolecule chitin is
Nitrogen-containing polysaccharide
Phosphorous containing polysaccharide
Sulphur containing polysaccharide
Simple polysacchaaride
Many elements are found in living organisms either free or in form of compounds. One of the following is negligible is living organisms
Silicon
Magnesium
Iron
Sodium
Following are the two statements regarding the origin of life.
II is correct, but I is false
Both I and II are correct
Both I and II are false
I is correct, but II is false
‘Sun basket’ is
The device to utilize sun rays directly to meet the requirement of heat energy
The sufficient amount of sunlight stored in a cell
A device of taking a sunbath
All of the above
Chlorosis is produced in the leaves due to the deficiency of Fe, Mg, Mn, S or N of these essential elements, those that are exclusive constituents of chlorophyll molecule are
Fe, S
N,S
Mg, S
Mg, N
The structures present in the roots to absorb water and minerals is
Epidermal extensions
Hypodermis
Endodermis
Epidermal appendages
Which of the following is responsible for biological nitrogen-fixation?
Nife gene
Nitrogenase
Yeast alanin tRNA synthetase
RNA synthetase
Nitrogen-fixation in root nodules of Alnus is brought about by
Bradyrhizobium
Clostridium
Frankia
Azorhizobium
Which of the following is non-symbiotic nitrogen fixer organism?
VAM
Azotobacter
Anabaena
Rhizobium