Plant and Human Physiology NDA Questions

NDA BIOLOGY

Plant and Human Physiology MCQ Questions


13.
Which of the following is classified as a macronutrient essential for plant growth?
A.
Nitrogen (N)
B.
Manganese (Mn)
C.
Zinc (Zn)
D.
Copper (Cu)
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ANSWER :
A. Nitrogen (N)
14.
Nitrogen fixation by Rhizobium in legume root nodules involves the enzyme:
A.
Nitrate reductase
B.
Glutamine synthetase
C.
Nitrite reductase
D.
Nitrogenase
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ANSWER :
D. Nitrogenase
15.
Leghaemoglobin in root nodules of legumes functions to:
A.
Protect nitrogenase enzyme from oxygen by acting as an oxygen scavenger
B.
Provide iron for chlorophyll synthesis
C.
Transport nitrogen gas into the nodule
D.
Act as an energy source for nitrogen fixation
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ANSWER :
A. Protect nitrogenase enzyme from oxygen by acting as an oxygen scavenger
16.
Deficiency of which element causes chlorosis (yellowing of leaves) primarily due to reduced chlorophyll synthesis?
A.
Phosphorus (P) and Potassium (K)
B.
Magnesium (Mg) and Nitrogen (N)
C.
Iron (Fe) and Manganese (Mn)
D.
Calcium (Ca) and Sulphur (S)
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ANSWER :
B. Magnesium (Mg) and Nitrogen (N)
17.
Which mineral nutrient is part of the structural component of the chlorophyll molecule itself?
A.
Nitrogen (N)
B.
Iron (Fe)
C.
Magnesium (Mg)
D.
Manganese (Mn)
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ANSWER :
C. Magnesium (Mg)
18.
Plant growth is said to be 'indeterminate' or 'open' because:
A.
Plants retain meristematic tissue throughout their life, allowing unlimited growth
B.
Plants grow only during favourable seasons
C.
All plant cells can divide equally
D.
Plants stop growing after flowering
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ANSWER :
A. Plants retain meristematic tissue throughout their life, allowing unlimited growth