131.
Asafoetida is a / an A
Resin
B
Gum
C
Olio gum resin
D
None of the above
Answer :
Olio gum resin
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132.
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation A
Nodules act as sites for nitrogen fixation
B
The enzyme nitrogenase catalyses the conversion atmospheric N2 to NH3
C
Nitrogenase is insensitive to oxygen
D
Leghaemoglobin scavenges oxygen ans is pinkish in colour
Answer :
Nitrogenase is insensitive to oxygen
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133.
In which of the following forms is iron absorbed by plants? A
Ferric
B
Ferrous
C
Both ferric and ferrous
D
Free element
Answer :
Ferric
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134.
Which one of the following is not an essential mineral element for plants while the remaining three are? A
Iron
B
Manganese
C
Cadmium
D
Phosphorus
Answer :
Cadmium
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135.
Stomatal movement is controlled by A
Na
B
Mg
C
K
D
P
Answer :
K
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136.
Which of the following is a trace element A
S
B
Mg
C
Cu
D
P
Answer :
Cu
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137.
Which of the following is not caused by deficiency of mineral nutrition A
Necrosis
B
Chlorosis
C
Etiolation
D
Shortening internode
Answer :
Etiolation
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138.
Which one of the following is wrong statement A
Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
B
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.
C
Nitrosomnas and Nitrobacter are chemoautotrophs
D
Anabaena and Nosloc are capable of fixing nitrogen in free-living state also.
Answer :
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.
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139.
Reserpine alkalodi is obtained from A
Cinchona officinalis
B
Podophyllum amoidae
C
Rauwolfia serpentine
D
Withania somniferum
Answer :
Rauwolfia serpentine
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140.
The plants grown in magnesium-deficient but urea sprayed soil would show A
deep green foliage
B
early flowering
C
yellowing of leaves
D
loss of pigments in petals
Answer :
yellowing of leaves
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