Q11
In which of the following, all three are macronutrients?
Correct Answer
Option D
Solution
(d) N, Ca, P are all macronutrients essential in large amounts.
Mineral Nutrition
Q12
Which of the following elements is responsible for maintaining turgor in cells?
Correct Answer
Option D
Solution
(d) Potassium ions regulate stomatal movements and maintain turgor pressure.
Q13
Which one is an essential mineral, not constituent of any enzyme but stimulates the activity of many enzymes
Correct Answer
Option C
Solution
(c) Potassium activates many enzymes but is not a structural component of any enzyme.
Q14
Phosphorus and nitrogen ions generally get depleted in soil because they usually occur as
Correct Answer
Option D
Solution
(d) Phosphate and nitrate are anions; ammonium is a cation; hence an unbalanced mixture.
Q15
Which one of the following is not an essential element for plants?
Correct Answer
Option C
Solution
(c) Iodine is essential for animals but not required by plants.
Q16
Which one of the following is a micronutrient for plants?
Correct Answer
Option C
Solution
(c) Manganese is a micronutrient required in trace amounts.
Q17
Passive absorption of minerals depends on
Correct Answer
Option A
Solution
(a) Passive mineral absorption is temperature-dependent but not inhibited by metabolic inhibitors.
Q18
Boron in green plants assists in
Correct Answer
Option A
Solution
(a) Boron assists in sugar transport across cell membranes.
Q19
In which of the following forms is iron absorbed by plants?
Correct Answer
Option A
Solution
(a) Iron is absorbed as Fe2+ (ferrous) or Fe3+ (ferric) ions.
Q20
The major portion of the dry weight of plants comprises of
Correct Answer
Option A
Solution
(a) C, H and O together make up ~90% of plant dry weight.
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