21.
Nitrogen is an important constituent of
A
Proteins
B
Lipids
C
Carbohydrates
D
Polyphosphates
Answer :
Proteins
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22.
In nature, organic compounds invariably contain
A
Carbon
B
Phosphorus
C
Sulphur
D
Magnesium
Answer :
Carbon
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23.
Transport of food material in higher plants takes place thrugh
A
Transfusion tissue
B
Tracheids
C
Sieve elements
D
Companion cells
Answer :
Sieve elements
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24.
Which of the following contains copper
A
Quinone
B
Plastoquinone
C
Plastocyanin
D
None of the above
Answer :
Plastocyanin
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25.
Translocation of sugar in flowering plants occurs in the form of
A
Maltose
B
Glucose
C
Sucrose
D
Starch
Answer :
Sucrose
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26.
Sinks are related to
A
Transport of organic solutes
B
Stomata
C
Enzymes
D
Phytochrome
Answer :
Transport of organic solutes
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27.
Legume plants are important for crop production because they
A
Help in NO2 Fixation
B
Do not help in NO2 Fixation
C
Increase soil fertility
D
All of the above
Answer :
Increase soil fertility
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28.
Reserpine is obtained from
A
Stem
B
Root
C
Rhizome
D
Stolon
Answer :
Root
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29.
Technique of growing plants without soil in nutrient solutions is called
A
Parthenogenesis
B
Hydroponics
C
Aquaculture
D
Tissue culture
Answer :
Hydroponics
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30.
Phosphorous and nitrogen ions generally get depleted in soil because they usually occur as
A
neutral ions
B
negatively charged ions
C
positively charged ions
D
both positively and negatively charged but disproportionate mixture
Answer :
both positively and negatively charged but disproportionate mixture
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