Class 11 Biology MCQ Questions of mineral nutrition, you will learn exhaustively about essential mineral nutrients that plants need for development and growth. What’s more, you will likewise figure out how plants retain these fundamental supplements, nutrients, deficiency symptoms, and the significance of nitrogen as a micronutrient and biological nitrogen fixation. We have provided Class 11 MCQ Questions with Answers to help students with understanding the concept well.

Check here and practice MCQ Questions for Class 11 Biology Mineral Nutrition with Answers were arranged dependent on the most recent exam pattern. The accompanying MCQ Questions for class 11 Biology and minor components will empower you to acquire more clarity of the concepts discussed within this chapter. Besides that, practicing these questions will likewise assist you with revising this Chapter altogether before examinations.

Practice MCQ Questions for class 11 Biology Chapter-Wise

1. The formation of first stable product of nitrogen fixation is catalyzed by the enzyme

(a) dehydrogenase
(b) nitrogenase
(c) isomerase
(d) none of these

2. Chlorosis will occur if a plant is grown in

(a) dark
(b) shade
(c) strong light
(d) Fe – free medium

3. Which one of the following mineral elements plays an in biological nitrogen fixation?

(a) Copper
(b) Manganese
(c) Zinc
(d) Molybdenum

4. Oxygen scavengers present in root nodules of legumes is

(a) haemoglobin
(b) leg haemoglobin
(c) cyano haemoglobin
(d) none of these

5. 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

6. Toxicity of which element leads to the appearance of brown spots on leaves

(a) Mg
(b) Mn
(c) Fe
(d) Cu

7. Exanthema is due to deficiency of

(a) B
(b) Mo
(c) Mn
(d) Cu

8. Whip-tail’ disease in cauliflower is noted due to deficiency of

(a) molybdenum
(b) manganese
(c) magnesium
(d) nitrogen

9. Death of stem and root tips occur due to deficiency of

(a) Calcium
(b) Nitrogen
(c) Carbon
(d) Phosphorus

10. Mineral associated with cytochrome is

(a) Cu 
(b) Mg 
(c) Fe and Mg 
(d) Fe and Cu

11. The association between blue-green algae and fungi occurs in 

(a) lichens
(b) symbiosis
(c) cannibalism
(d) mycorrhiza

12. Which element is required by the plants for uptake and utilization of calcium and carbohydrate translocation?

(a) Manganese
(b) Boron
(c) Chlorine
(d) Selenium

13. How many ATP molecules are required to biologically fix one molecule of nitrogen into two molecules of ammonia?

(a) 4
(b) 8
(c) 12
(d) 16

14. When the plants are grown in magnesium-deficient but urea rich soil, the symptoms expressed are:

(a) yellowish leaves
(b) colourless petiole
(c) dark green leaves
(d) shoot apex die

15. Deficiency symptoms of nitrogen and potassium are visible first in

(a) senescent leaves
(b) young leaves
(c) roots
(d) buds

16. The most abundant intracellular cation is

(a) \(Na^+\)
(b) \(Ca^{2+}\)
(c) \(H^+\)
(d) \(K^+\)

17. Best defined function of manganese in green plants is

(a) photolysis of water
(b) Calvin cycle
(c) nitrogen fixation
(d) water absorption

18. An organism used as a biofertilizer for raising soyabean crops is

(a) Azospirillum
(b) Rhizobium
(c) Nostoc
(d) Azotobacter

19. Obligate parasites are organisms that 

(a) Are saprophytes but can also become parasites.
(b) Are pests but can also become saprophytes.
(c) Consume only dead and organic matter.
(d) Consume living host.

20. Among the elements given below, which one has not yet been proved as essential for plants?

(a) Zinc
(b) Iron
(c) Potassium
(d) Sodium

21. The middle lamella mainly contains

(a) Na
(b) Mg
(c) K
(d) Ca

22. Non-symbiotic nitrogen-fixing prokaryote is

(a) Frankia
(b) Acetobacter
(c) Rhizobium
(d) Azotobacter

23. Which one of the following organism help in absorption of phosphorus from soil by plants

(a) Glomus
(b) Frankia
(c) Rhizobium
(d) Anabaena

24. The deficiencies of micronutrients, not only affect the growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport? 

(a) Co, Ni, Mo
(b) Ca, K, Na
(c) Mn, Co, Ca
(d) Cu, Mn, Fe

25. Grey spots of oat are caused by deficiency of

(a) Fe
(b) Cu 
(c) Zn
(d) Mn

Answer:

 1.Answer: (b) nitrogenase

Explanation: The nitrogen fixation bacterium has nitrogenase enzyme, which is found in the leguminous plant root nodules. A multi-step reaction catalyzed by the bacterial nitrogenase enzyme converts the free nitrogen gas to ammonium ions.

2. Answer: (d) Fe – free medium

Explanation: Chlorosis is normally a symptom of the plant disease in which the plant gets pale or yellow in color from green color. It is the failure of the green pigment chlorophyll because of the lack of nutrients or oxygen in the plan leaves. Chlorosis is mainly caused by the deficiency of the iron in the plant leaves.

3. Answer:(d) Molybdenum

Explanation: Molybdenum (Mo) is a component of enzyme nitrogenase and thus, plays an important role in biological nitrogen fixation.

4. Answer: (b) leg haemoglobin

Explanation: Leghaemoglobin is present in the root nodules of legume plants. This functions like a scavenger for oxygen. - Leghaemoglobin is a scavenger of oxygen that protects nitrogenase during fixation of nitrogen.

5. Answer: (b) There is nitrogen-deficient soil

Explanation: Insectivorous plants commonly grow in areas where the soil is deficient in Nitrogen. Insectivorous plants are the plants that derive some or most of their nutrients (but not energy, which they derive from photosynthesis) from trapping and consuming animals or protozoans, typically insects and other arthropods.

6. Answer: (b) Mn

Explanation: The toxicity of manganese causes a decreased uptake of both Mg and Fe, inhibition of Calcium relocation as well as inhibition of binding of manganese with various enzymes. This causes decreased chlorophyll production, and in turn, causes chlorotic veins and brown spots.

7. Answer: (d) Cu

Explanation: Copper deficiency is responsible for exanthema in citrus. Fruits reveal patches of gum around the central pith. Exudation of the gum can also be observed on the rind.

8. Answer: (a) molybdenum

Explanation: The condition known as " whiptail .. in cauliflower and broccoli has been shown to be due to a deficiency of molybdenum (Davies, 1945).

9. Answer: (a) Calcium

Explanation: "Calcium" is essential for the growth of root tips. Calcium is present in the cell walls in the form of 'calcium pectate'. It helps in holding the plant's cells together and for the growth of the new cells.

10. Answer: (d) Fe and Cu

Explanation:  Minerals associated with cytochrome are Fe and Cu. Cytochromes are Iron-containing (Iron porphyrin protein) electron transferring (the electrons are picked up and released by Fe) except Cytochrome-\(a_3.\)

11.Answer: (a) lichens

Explanation: In lichens, the association between an algae and a fungus is considered to be a symbiotic one. In this association, algae provide food to fungi.

12.Answer: (b) Boron

Explanation:Plants require boron in leaves and seeds. It is required for uptake and utilization of calcium, pollen germination, and cell differentiation, and carbohydrate translocation.

13. Answer: (d) 16

Explanation: one molecule of dinitrogen requires 16 ATP molecules to form 2 ammonia molecules.

14. Answer: (a) yellowish leaves

Explanation: Deficiency of Mg causes chlorosis i.e., yellowing of leaves. Thus a plant growing in magnesium-deficient soil would show chlorosis inspite of being sprayed with urea (nitrogen).

15.Answer: (a) senescent leaves

Explanation: Deficiency symptoms of nitrogen and potassium are visible first in senescent (older) leaves. Due to nitrogen deficiency, the symptoms include poor plant growth, and leaves become pale green or yellow because they're unable to form sufficient chlorophyll.

16. Answer: (d) \(K^+\)

Explanation:The major cation in the intracellular fluid is potassium. These electrolytes play an important role in maintaining homeostasis.

17. Answer: (a) photolysis of water

Explanation:Manganese is used for the photolysis of water to produce oxygen and electrons during the light reaction of photosynthesis. It is the phenomenon of breaking up water into hydrogen and oxygen in the illuminated chloroplast. It acts as an essential cofactor.

18. Answer: (b) Rhizobium

Explanation: Rhizobium is a bacteria that live inside the root nodules of leguminous plants. They form a symbiotic association with the plant. They fix the atmospheric nitrogen for the plants. They are used in soybean and pea plant fields as biofertilizers.

19. Answer: (d) Consume living host

Explanation:An obligate parasite or holoparasite is a parasitic organism that cannot complete its life cycle without exploiting a suitable host. If an obligate parasite cannot obtain a host it will fail to reproduce.

20. Answer: (d) Sodium

Explanation:The 17 essential elements of the plants are divided into two major categories called micronutrients and macronutrients. The element which is not so essential consists of an atomic number 16. So, the correct answer is 'Sodium'.

21. Answer: (d) Ca

Explanation: The middle lamella is made up of calcium and magnesium pectates. In a mature plant cell, it is the outermost layer of the cell wall.

22. Answer:(d) Azotobacter

Explanation: Azotobactera is non-symbiotic or free-living bacterium. It helps in the nitrogen fixation.

23. Answer: (a) Glomus

Explanation: Many members of the genus Glomus form mycorrhiza. The fungal symbiont in these associations absorbs phosphorus from soil and passes it to the plant.

24.Answer: (d) Cu, Mn, Fe

Explanation: Cu (copper), Mn (manganese), and Fe (iron) are those micronutrients, which affect both photosynthesis and mitochondrial electron transport because they are the main constituents of various electron carriers.

25. Answer:(d) Mn

Explanation: The deficiency of Manganese leads to a grey spot of Oat disease. In this condition, the brown elongated speck and streaks are found in panicles. Development of the root system is poor.

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