CBSE Class 11 Biology – MCQ and Online Tests – Unit 12 – Mineral Nutrition
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CBSE Class 11 Biology – MCQ and Online Tests – Unit 12 – Mineral Nutrition
Question 1.
Mineral salts which are absorbed by the roots from soil are in the form of
(a) Dilute solution
(b) Very concentrated solution
(c) Concentrated solution
(d) Very dilute solution
Answer
Answer: (d) Very dilute solution
Question 2.
Which one of the following mineral elements plays an in biological nitrogen fixation?
(a) Copper
(b) Manganese
(c) Zinc
(d) Molybdenum
Answer
Answer: (d) Molybdenum
Question 3.
The formation of first stable product of nitrogen fixation is catalysed by enzyme
(a) dehydrogenase
(b) nitrogenase
(c) isomerase
(d) none of these
Answer
Answer: (b) nitrogenase
Explanation:
The first stable product of nitrogen fixation is ammonia obtained from atmospheric nitrogen catalysed enzyme nitrogenase.
Question 4.
Manganese toxicity leads to deficiency of
(a) iron
(b) calcium
(c) magnesium
(d) all of the above
Answer
Answer: (d) all of the above
Explanation:
Manganese toxicity causes deficiency of iron, magnesium and calcium.
Question 5.
Exanthema is due to deficiency of
(a) B
(b) Mo
(c) Mn
(d) Cu
Answer
Answer: (d) Cu
Question 6.
NPK denotes
(a) Nitrogen, Protein, Kinetin
(b) Nitrogen, Protein, Potassium
(c) Nitrogen, Potassium, kinetin
(d) Nitrogen, Phosphorus, Potassium
Answer
Answer: (d) Nitrogen, Phosphorus, Potassium
Question 7.
Chlorosis will occur if a plant is grown in
(a) dark
(b) shade
(c) strong light
(d) Fe – free medium
Answer
Answer: (d) Fe – free medium
Question 8.
Choose the correct function of magnesium.
(a) It is a constituent of several coenzyme.
(b) It activates the enzymes of respiration and photosynthesis.
(c) It activates enzyme catalase.
(d) It helps in maintaining anion-cation balance.
Answer
Answer: (b) It activates the enzymes of respiration and photosynthesis.
Explanation:
Magnesium is absorbed by plants as Mg2+
It activates the enzymes of respiration and photosynthesis.
It is involved in the synthesis of DNA RNA.
It is the constituent of ring structure of chlorophyll.
It helps to maintain ribosome structure.
Question 9.
Oxygen scavangers present in root nodules of legumes is
(a) haemoglobin
(b) leg haemoglobin
(c) cyano haemoglobin
(d) none of these
Answer
Answer: (b) leg haemoglobin
Explanation:
Leg-haemoglobin is the oxygen scavanger in root nodules of legumes.
Question 10.
Which one of the following is not a micronutrient?
(a) Magnesium
(b) Molybdenum
(c) Boron
(d) Zinc
Answer
Answer: (a) Magnesium
Question 11.
Which of the following is not a macronutrient
(a) iron
(b) calcium
(c) manganese
(d) phosphorus
Answer
Answer: (c) manganese
Question 12.
In plants, a common symptom caused by deficiency of P, K, Ca and Mg is the
(a) bending of leaf tip
(b) formation of anthocyanins
(c) poor development of vasculature
(d) appearance of dead necrotic tissue
Answer
Answer: (d) appearance of dead necrotic tissue
Question 13.
Function of zinc is
(a) Closing of stomata
(b) Biosynthesis of 3-IAA
(c) Synthesis of chlorophyll
(d) Oxidation of carbohydrate
Answer
Answer: (c) Synthesis of chlorophyll
Question 14.
Insectivorous plants grow where
(a) There is carbohydrate deficient soil
(b) There is nitrogen deficient soil
(c) Vitamin c is required
(d) Hormones are required
Answer
Answer: (b) There is nitrogen deficient soil
Question 15.
Phytotron is meant for
(a) Controlled humidity
(b) Induction of mutations
(c) Controlled irradiation
(d) Growing plants under controlled environment
Answer
Answer: (d) Growing plants under controlled environment
Question 16.
Toxicity of which element leads to the appearance of brown spots on leaves
(a) Mg
(b) Mn
(c) Fe
(d) Cu
Answer
Answer: (b) Mn
Explanation:
Toxicity of mangenese leads to the appearance of the brown spots with chlorotic veins.
Question 17.
Presence of phosphorus
(a) brings about healthy root growth
(b) promotes fruit ripening
(c) retards protein formation
(d) none
Answer
Answer: (c) retards protein formation
Question 18.
Which element is required for opening and closing of stomata?
(a) P
(b) K
(c) Ca
(d) Na
Answer
Answer: (b) K
Explanation:
Potassium plays an important role in opening and closing of stomata.
Question 19.
Which of the following is a group of micronutrients?
(a) Ca, Zn, B
(b) Fe, Mn, Cu
(c) Cl, C, Ca
(d) Ni, Mo, H
Answer
Answer: (b) Fe, Mn, Cu
Explanation:
Iron, mangenese and copper are micronutrients.
Question 20.
The process of conversion of NO2– to N2 is called
(a) nitrification
(b) ammonification
(c) denitrification
(d) nitrogen fixation
Answer
Answer: (c) denitrification
Explanation:
The process of conversation of NO2– to N2 is called denitrification.
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