15931.Plants absorb mineral salts from the soil solution through
The cell wall which is semipermeable
Perforation at the apex of rot hair cells
A semipermeable membrane into the cytoplasm
None of these
15935.A trace element is an element Which of the statements given above is/are correct?
is a radio active and can be traced by Geiger counter
is required in very minute amounts
draw other element out of protoplasm
was one of the first to be discovered in protoplasm
15937.A facultative parasite is one which
always requires a living host
is normally a saprophyte but can also become a parasite
never requires a living host
none of these
15938.The function of leghemoglobin in the root nodules of legumes is
Oxygen removal
Inhibition of nitrogenase activity
Expression of nif gene
Nodule differentiation
15939.Obligate parasites are those organisms which
live only on living host
live only on dead and decaying organic matter
are essentially parasites but can also become saprophytes
are essentially saprophytes but can also become parasites
15940.All heterotrophs require environment which can provide
Nitrates in solution
Organic compounds
Ammonium salts
Vitamin A
15941.Boron in green plants assists in
Activation of enzymes
Acting as enzyme cofactor
Photosynthesis
Sugar transport
15942.Insectivorous plants are usually adapted to
Water rich soils
Soils deficient in sugars
Soils rich in trace elements
Soils deficient in nitrogenous compounds
15943.Non-legume nitrogen fixing organisms belongs to genus
Rhizobium
Franken
Clostridium
Azotobacter
15944.Phytotron is meant for
Controlled humidity
Induction of mutations
Controlled irradiation
Growing plants under controlled environment
15945.Conduction of inorganic materials in plants occur mainly through minerals absorbed by roots move to the leaf through
Sieve tube
Phloem
Xylem
None of these
15946.In hydrophytic plants, water and salts are absorbed by
Stem
Leaves
Roots
Outer layer of plants
15947.Ions are absorbed by the plants through
Difference in water potential
Carriers and pumps
Molecular diffusion
Difference in D.P.D.
15948.Carbon become available to crop plants in the form of
Amino acids
Carbonates
Carbon dioxide
Element carbon