PrepBharat

1. Function of zinc is
a) Synthesis of chlorophyll
b) Biosynthesis of IAA
c) Closing of stomata
d) Oxidation of carbohydrate

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2. The process by which minerals are absorbed is
a) Active absorption
b) Passive absorption
c) Both (a) and (b)
d) None of these

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3. The active uptake of minerals by roots mainly depends on the
a) Availability of oxygen
b) Light
c) Temperature
d) Availability of carbon dioxide

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4. Identify A to D in the given figure.

a) A–Decaying biomass, B–Electrical \[N_{2}\] fixation, C–Plant biomass, D–Ammonification
b) A–Plant biomass, B–Decaying biomass, C–Ammonification, D–Electrical \[N_{2}\] fixation
c) A–Electrical \[N_{2}\] fixation, B–Ammonification, C–Decaying biomass, D–Plant biomass
d) A–Ammonification, B–Plant biomass, C–Electrical \[N_{2}\] fixation, D–Decaying biomass

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5. Nitrogen is a component of
a) Protein
b) Chlorophyll
c) Nucleic acid
d) All of these

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6. Which one of the following can fix atmospheric nitrogen directly?
a) Pea
b) Brassica
c) Castor
d) Petunia

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7. Knot like bodies known as ‘nodules’ are found in the roots of groundnut plant it is produced by
a) Azospirillum
b) Azotobacter
c) Pseudomonas
d) Rhizobium

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8.Nitrogen fixation means
a) \[N_{2}\] changes in \[NO_3^-\]
b) \[N_{2}\] changes in \[NH_{3}\]
c) \[N_{2}\] change into nitrates
d) none of these

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9. Nif genes occur in
a) Rhizobium
b) Aspergillus
c) Penicillium
d) Streptococcus

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10. Identify A to C in the given figure.

a) A–Bacteria, B–Root hair, C–Soil particles
b) A–Root hair, B–Bacteria, C–Soil particles
c) A–Root hair, B–Soil particles, C–Bacteria
d) A–Soil particles, B–Bacteria, C–Root hair

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