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Quiz 11
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Q.1
Which of the following gene clusters in bacteria is responsible for N2 fixation?
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a) nod, ori, f.
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b) nod, fix, nif.
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c) nod, ti, cry.
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d) nod, nif, rop.
Explanation
Answer:(b)
Q.2
Assertion: Hydroponics is one of the investigatory method to study the mineral requirements of plants. Reason: By hydroponics, essential elements were identified and their deficiency symptoms were discovered.
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
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c) Assertion is true but Reason is false.
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d) Both Assertion and Reason are false.
Explanation
Answer:(a)
Q.3
Read the following statements: (i) Transfer of amino group from amino acid to keto group of a keto acid – Transamination. (ii) Hydroxyl part of amino acid is replaced by another amino acid – Amide formation. (iii) Transfer of amino group from keto acid to amino acid – Transamination. (iv) Hydroxyl part of keto acid is replaced by amino group – Amide formation. (v) Ammonia reacts with α ketoglutaric acid in the presence of NADPH and H+ and glutamate dehydrogenase to form glutamic acid. Which of the above statements are correct?
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a) (iii), (iv), (v).
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b) (i), (ii), (v).
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c) (i), (iv), (v).
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d) (ii), (iii), (v).
Explanation
Answer:(b)
Q.4
Amides are transported to the other parts of the plant through:
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a) Xylem vessels.
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b) Phloem.
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c) Sieve tubes.
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d) Both A and C.
Explanation
Answer:(a)
Q.5
Chlorosis is the loss of chlorophyll leading to yellowing in leaves. This symptom is caused by the deficiency of elements like:
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a) Ca, Mg, Cu, K.
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b) N, K, Ca, Mg, Fe, Mn.
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c) K, N, Mg, S, Fe, Mn, Zn, Mo.
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d) N, Mg, Fe, Zn, Mo.
Explanation
Answer:(c)
Q.6
N2 fixation in Alnus is brought about by:
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a) Frankia.
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b) Rhizobium.
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c) Nitrococcus.
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d) Azospirillum
Explanation
Answer:(a)
Q.7
Count the total number of true statements: (i) Potassium help to maintain anion cation balance in cells and is involved in protein synthesis. (ii) Mg2+ is an activator for both ribulose biphosphate carboxylase oxygenase and PEP carboxylase. (iii) Plants obtain sulphur in the form of SO (iv) Decomposition of organic nitrogen of dead plants and animals into ammonia is called ammonification. (v) Any mineral ion concentration in tissues that reduces the dry weight of tissues by 10% is considered as toxic.
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a) 1
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b) 2
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c) 3
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d) 4
Explanation
Answer:(d)
Q.8
Which of the following does not fix atmospheric nitrogen?
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a) Nostoc.
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b) Anabaena.
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c) Spirogyra.
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d) Azotobacter.
Explanation
Answer:(c)
Q.9
Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
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a) Frequent irrigation of the crop
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b) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
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c) Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5 trichlorophenoxy acetic acid
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d) Application of iron and magnesium to promote synthesis of chlorophyll.
Explanation
Answer:(d)
Q.10
What is concentration of micronutrients in the dry mass of plants per gram ?
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a) 1 to 10 mg
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b) 0.1 mg
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c) 0.1 mg or less than that
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d) 10 mg or more than that
Explanation
Answer:(c)
Q.11
Deficiency of which element shows stunted growth ?
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a) Mo, Ca, S, N
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b) Cl, N, Cu, Zn
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c) P, S, Mn, Ca
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d) K, N, Fe, Ca
Explanation
Answer:(a)
Q.12
Donnan equillibrium is achieved at which surface ?
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a) Cell wall
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b) Nuclear membrance
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c) plasma membrance
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d) Vascular membrace
Explanation
Answer:(d)
Q.13
What is the function of leg haemoglobin ?
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a) To protect Nif gene from the side effect of O2
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b) To proctect nitrogenase from the side effect of O2
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c) To provide atmosheric N2 to Rhizobium bzcteria
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d) To synthesis reduction inducing unit FAD.
Explanation
Answer:(b)
Q.14
Due to natural lightening ...
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a) Nitrate is converted into Nitride
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b) N2 is converted into nitrate
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c) Modify from NO3 to N2
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d) to increase activity of Reductive Amination
Explanation
Answer:(b)
Q.15
Major portion of the dry weight of plants comprises of:
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a) Nitrogen, phosphorus, potassium.
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b) Calcium, magnesium, sulphur.
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c) Carbon, nitrogen, hydrogen.
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d) Carbon, hydrogen, oxygen.
Explanation
Answer:(d)
Q.16
Transamination reaction is catalysed by the enzyme:
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a) Glutamate dehydrogenase.
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b) Transaminase.
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c) Glutamate hydrogenase.
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d) Aspartate synthase.
Explanation
Answer:(b)
Q.17
Ammonia is first oxidised to nitrate by the bacteria in nitrogen fixation is:
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a) Nitrosomonas
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b) Nitrococcus.
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c) Nitrobacter.
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d) Both A and B.
Explanation
Answer:(d)
Q.18
Which enzyme complex is responsible for the reduction of molecular nitrogen to the level of NH3 in root module of legume?
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a) Aminase.
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b) Nitrogenase.
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c) Nitrate reductase.
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d) Nitrite reductase.
Explanation
Answer:(b)
Q.19
Which group is included in micronutrients ?
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a) Mn, Cu, Mo
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b) Cl, Ni, Co, Mg
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c) C, H, O, N
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d) Cl, S, Ni, Fe
Explanation
Answer:(a)
Q.20
What is the function of Zn ?
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a) Synthesis of Carboxyalase enzyme
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b) Formation of Indol Acetic acid (IAA)
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c) required for absprption and utilization of Ca.
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d) required for maintenance of ribosomal constituent.
Explanation
Answer:(b)
Q.21
Which inorganic substance is obtained by N2 - fraction ?
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a) Ammonium
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b) amino acid
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c) Ammonia
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d) Ammonium Hydroxide
Explanation
Answer:(c)
Q.22
Correlate the names of the bacteria with the related functions they carry out:
a. Nitrosomonas
Symbiotic nitrogen fixation
b. Frankia
Free living nitrogen fixation
c. Bacillus ramosus
Nitrification
d. Beijernickia
Ammonification
e. Rhizobium
Symbiotic nitrogen fixation in the roots of Alnus
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a) a → 3 ; b →5 ; → 4 ; d → 2 ; e → 1 ;
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b) a → 3 ; b →2 ; → 4 ; d → 5 ; e → 1 ;
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c) a → 4 ; b →5 ; → 2 ; d → 1 ; e → 3 ;
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d) a → 5 ; b →3 ; → 4 ; d → 1 ; e → 2 ;
Explanation
Answer:(a)
Q.23
Nitrifying bacteria:
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a) Convert free nitrogen to nitrogen compounds.
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b) Convert proteins into ammonia.
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c) Reduce nitrates to free nitrogen.
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d) Oxidize ammonia to nitrates.
Explanation
Answer:(d)
Q.24
The absorption, distribution and metabolism of various mineral elements is called .....
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b) absorption of mineral salts
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a) dispersal of mineral
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c) mineral metabolism
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d) mineral nutrition
Explanation
Answer:(d)
Q.25
Which is the correct path of transport of mineral nutrients from roots ?
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a) Root epidernal layer → endodermis → cortex → Pericycle → xylem tissue
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b) Root epidernal layer → cortex → endodermis → xylem tissue → Pericycle
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c) Root epidernal layer → cortex → endodermis → Pericycle → xylem tissue
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d) Root epidernal layer → Pericycle → cortex → endodermis → xylem tissue
Explanation
Answer:(c)
Q.26
Which are criteria for Essentiality of Elements. Choose the correct sentences from given sentences. (i) A plant must be able to complete its life cylce in the absence of the mineral element. (ii) The function of the element must not be replaceable by another mineral element. (iii) All minerals which are absorbed by plants are not essential minerals.
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a) i and ii
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b) iii and i
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c) ii and iii
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d) only ii
Explanation
List the criteria for essentiality of elements. 1.The essential elements should be necessary for growth and reproduction of the plant. It should be indispensable. The plant should not be able to complete its life cycle in the deficiency of the element. 2.The element should not be replaceable and its requirement should be specific. The deficiency of the element should not be met by supplying some other element. 3. There should be direct involvement of the element in the metabolism of the plant Answer:(d)
Q.27
Which is proper pair of ions and its deficiency symtoms ?
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a) Nitrogen - Induction of dormancy
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b) Potassium - Scorched look to leaves
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c) Phosphorous - Chlorosis
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d) Zinc - Brown spoted of fruit
Explanation
Answer:(b)
Q.28
Select improper pair for the N2 fixation to the formation of Amino acid process.
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a) FAD - Reduction inducing unit
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b) Essential enzymes - Hydrogenase, Nitrogenase
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c) ATP - the introduction of H2 units in a diatomic N2 unit.
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d) Reductive Amination - Nitrogenase.
Explanation
Answer:(d)
Q.29
Which type of transport of mineral elements is shown in the given diagram ?
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a) Fig x Sympart Fig y Unipart
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b) Fig x Unipart Fig y Antipart
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c) Fig x Sympart Fig y Antipart
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d) Fig x Antipart Fig y sympart
Explanation
Answer:(c)
Q.30
By which principle, indirect storage of stable and non-diffusible ions is explained ?
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a) ion exchange
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b) principle of mass flow
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c) Donnan equillibrium
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d) principle of Diffusion
Explanation
Answer:(c)
0 h : 0 m : 1 s
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