CBSE Class 11 Biology Mineral Nutrition MCQs

Question : Which element is located at the centre of the porphyrin ring in chlorophyll ?
a) Calcium
b) Potassium
c) Manganese
d) Magnesium
Answer : A

Question : Which one of the following mineral elements plays an important role in biological nitrogen fixation ?
a) Molybdenum
b) Manganese
c) Copper
d) Zinc
Answer : A

Question : Leghaemoglobin helps in
a) protecting nitrogenase from O₂
b) destroys bacteria
c) transport of food in plants
d) nitrogen fixation
Answer : A

Question : ‘Whip-tail’ disease in cauliflower is noted due to deficiency of
a) molybdenum
b) manganese
c) magnesium
d) nitrogen
Answer : A

Question : Which of the following is correct set of micronutrient for plants?
a) Cu, Fe, Zn, B, Mn
b) Mo, Zn, Cl, Mg, Ca
c) Mg, Fe, Zn, B, Mn
d) Mg, Si, Fe, Cu, Ca
Answer : A

Question : A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is
a) Anabaena
b) Chlorella
c) Tolypothrix
d) Nostoc
Answer : A

Question : Azotobacter and Beijerinckia are the examples of
a) non-symbiotic nitrogen-fixers
b) ammonifying bacteria
c) None of these
d) symbiotic nitrogen-fixers
Answer : A

Question : Which of the following is not performed by root hairs ?
a) CO₂ uptake
b) Oxygen uptake
c) Water uptake
d) Mineral uptake
Answer : A

Question : The plant ash is an indication of
a) mineral salts absorbed by plants
b) None of the above
c) waste product
d) organic matter of plant
Answer : D

Question : Hydroponics is
a) soilless culture
b) nutrient less culture
c) water less culture
d) none of these
Answer : B

Question : Which element is required in the germination of pollen grain?
a) Boron
b) Chlorine
c) Potassium
d) Calcium
Answer : A

Question : A trace element essential for plant growth and radio-isotope, which is used in cancer therapy is
a) cobalt
b) sodium
c) iron
d) calcium
Answer : A

Question : Which one of the following elements in plants is not remobilised?
a) Calcium
b) Sulphur
c) Phosphorus
d) Potassium
Answer : A

Question : Plants die from prolonged water-logging because
a) root respiration stops.
b) cell sap in the plants becomes too dilute.
c) nutrients leach down due to excess water.
d) soil nutrients become very dilute.
Answer : A

Question : Which of the following minerals activate the enzymes involved in respiration?
a) magnesium and manganese
b) nitrogen and phosphorus
c) potassium and calcium
d) sulpur and iron
Answer : A

Question : Soil can easily become deficient in____________ because these ions are negatively charged and do not stick to negatively charged clay particles.
a) Nitrate
b) Ammonium
c) Both
d) None of these
Answer : A

Question : Legumes’ roots have swellings called nodules that
a) contain nitrogen-fixing bacteria
b) increases the surface area for water uptake
c) provide a steady supply of sugar to the host plant
d) produce antibiotics that protect the plant from soil bacteria
Answer : A

Question : Macronutrients are_____ than micronutrients
a) Needed in greater quantities
b) More essential
c) More important for growth
d) Larger molecules
Answer : A

Question : ‘Hunger signs’ in plants are
a) Deficiency symptoms of particular mineral nutrients
b) None of the above
c) Sympotms due to poor photosynthesis in plants
d) Symptoms due to lesser water absorption in plants
Answer : A

Question : Death of stem and root tips occur due to deficiency of
a) Calcium
b) Nitrogen
c) Carbon
d) Phosphorus
Answer : A