Download III BSC BT - 609 W1

Dr.G.R.Damodaran College of Science
(Autonomous, affiliated to the Bharathiar University, recognized by the UGC)Re-accredited at
the 'A' Grade Level by the NAAC and ISO 9001:2008 Certified
CRISL rated 'A' (TN) for MBA and MIB Programmes
III BSc [2014-2017]
Semester VI
Elective II : PLANT BIOCHEMISTRY- 609 W1
Multiple Choice Questions.
1. To enter or leave a cell, substances must pass through ________.
A. a microtubule.
B. the golgi apparatus.
C. the plasma membrane.
D. the nucleus.
ANSWER: C
2. Which of the common features are shared by mitochondria and chloroplasts?
A. Both are capable of semiautonomous growth and reproduction.
B. Neither are components of the endomembrane system.
C. Each contains a small amount of DNA.
D. All the above.
ANSWER: D
3. Pectin matrix contains polymers of _____________.
A. glucuronic acid.
B. galacturonic acid.
C. iduronic acid.
D. uronides.
ANSWER: B
4. Leucoplasts are involved in the synthesis of ______________.
A. monoterpenes.
B. terpentines.
C. alkaloids.
D. flavonoids.
ANSWER: A
5. Cell walls of adjacent cells are connected by ____________.
A. middle lamellae.
B. plasma membrane.
C. plasmodesmata.
D. cell wall.
ANSWER: C
6. Oxysomes are found in _________________.
A. nucleus.
B. mitochondria.
C. golgiapparatus.
D. ribosomes.
ANSWER: B
7. Dictyosomes are discovered by ______________.
A. Golgi.
B. Went.
C. James.
D. wright.
ANSWER: A
8. Leucoplasts are ________________ plastids.
A. orange coloured.
B. red coloured.
C. colourless.
D. green coloured.
ANSWER: C
9. Protochlorophyllide is produced by _______________.
A. leucoplasts.
B. chloroplasts.
C. etioplasts.
D. amyloplasts.
ANSWER: A
10. Which of the following is not the function of the plastids proteins?
A. Photosynthesis.
B. Storage of products.
C. Functioning of the plant cells.
D. Removal of toxic products.
ANSWER: D
11. The following are true with regard to cellulose except __________.
A. cell is a polymer of beta D-glucose.
B. cells is synthesized in presence of UDPG in cell free system.
C. beta-amylase are involved in the degradation of cellulose.
D. phosphorylation of glucose molecule is essential in the synthesis of cellulose.
ANSWER: C
12. Vacuoles play several metabolic roles except ______________.
A. storage.
B. digestion.
C. synthesis.
D. ionic homeostasis.
ANSWER: A
13. The cell organelle assists in seed germination is ______________.
A. peroxysomes.
B. glyoxysomes.
C. microsomes.
D. nucleosomes.
ANSWER: B
14. Which of the following are starch storing plastids?
A. Chloroplast.
B. Leucoplast.
C. Amyloplast.
D. Etioplast.
ANSWER: C
15. Plastids and mitochondria inherit __________________.
A. maternally.
B. paternally.
C. biparentally.
D. none of the above.
ANSWER: A
16. The organelle that plays a key role in photorespiration is ______________.
A. mitochondria.
B. golgi apparatus.
C. nucleus.
D. peroxysomes.
ANSWER: D
17. The hydrogen peroxide produced is destroyed by the ______________.
A. phosphotase.
B. catalase.
C. nuclease.
D. lipase
ANSWER: B
18. Which of the following cell organelles is a carbohydrate factory of the cell?
A. Mitochondria.
B. Golgi apparatus.
C. Vacuoles.
D. Endoplasmic reticulum.
ANSWER: B
19. The de novo synthesis of fatty acid takes place in_________.
A. plastids.
B. nucleus.
C. mitochondria.
D. cytoplasm.
ANSWER: A
20. Which of the following toxic compound is accumulated in vacuoles to destroy microbial pathogens?
A. Phenolic compounds.
B. Terpenoids.
C. Alkaloids.
D. Saponins.
ANSWER: A
21. The flavour of fruits and vegetables is due to the compounds stored in ______________.
A. vacuoles.
B. cell wall.
C. chloroplast.
D. mitochondria.
ANSWER: A
22. Which of the following is not the function of plastid?
A. Energy capture.
B. Storage.
C. Biosynthesis of fatty acids.
D. Biosynthesis of carbohydrate.
ANSWER: D
23. Cristae are present in _________________.
A. mitochondria.
B. chloroplast.
C. golgi apparatus.
D. plasma membranes.
ANSWER: A
24. Mitochondrial ribosomes are sensitive to ____________.
A. tetracyclin.
B. chloramphenicol.
C. ampicillin.
D. carbinicillin.
ANSWER: B
25. The membrane associated with secretory pathway is ________________.
A. plasma membrane.
B. endocytic vesicles.
C. vacuoles.
D. golgi apparatus.
ANSWER: D
26. The storage oil of seeds are called as ______________.
A. triacyl glycerol.
B. glycerol.
C. fatty acids.
D. lipids.
ANSWER: A
27. Triacyl glycerols are stored in _________________.
A. resins.
B. oleosins.
C. porins.
D. aquaporins.
ANSWER: B
28. The storage proteins in cereal plants are _____________.
A. albumin and globulin.
B. albumin and prolamin.
C. globulin and prolamin.
D. zeatin and gelatin.
ANSWER: C
29. Every cell needs __________ gene for basic function independent of its specialization.
A. nodulin.
B. inducible.
C. housekeeping.
D. non inducible.
ANSWER: C
30. The following organelles possess circular genome except ________________.
A. plastids.
B. mitochondria.
C. nucleus.
D. peroxisomes.
ANSWER: D
31. The chief water conducting elements of xylem in gymnosperms are __________.
A. tracheids.
B. vessels.
C. fibers.
D. transfusion tissue.
ANSWER: A
32. In hydrophytic plants, water and salts are absorbed by _______________.
A. stem.
B. root.
C. outer layer of plants.
D. leaves.
ANSWER: C
33. Increase in the CO2 concentration of micro environment of leaf would cause ________ of stomata.
A. closure.
B. opening.
C. no effect.
D. widening.
ANSWER: A
34. Flooding kills plants because ________.
A. cell sap in plants become too dilute.
B. root respiration ceases.
C. excess water leaches down plant nutrients.
D. cell sap in plants become too dilute.
ANSWER: B
35. Guard cells differ from epidermal cells in having _________.
A. nucleus.
B. mitochondria.
C. ribosomes.
D. chloroplasts.
ANSWER: D
36. Guttation is caused by __________.
A. transpiration.
B. osmosis.
C. root pressure.
D. osmotic pressure.
ANSWER: C
37. If CO2 concentration suddenly increases around the leaf, one of the following events occurs.
A. Stomata open gradually.
B. Stomata open suddenly.
C. Transpiration will not be affected.
D. Decrease in transpiration due to sudden closure of stomata.
ANSWER: D
38. If the concentration of external solution is more than the cytoplasm, the solution is known as ________.
A. hypertonic.
B. isotonic.
C. hypotonic.
D. none of the above.
ANSWER: A
39. The breathing roots are the __________.
A. rhizoids.
B. stomata.
C. pneumatophores.
D. lenticels.
ANSWER: C
40. Fertilizers are usually enriched in __________.
A. iron, manganese, and zinc.
B. calcium, boron, and carbon.
C. nitrogen, phosphorus, and potassium.
D. molybdenum, copper, and magnesium.
ANSWER: C
41. The relationship between legumes and rhizobium is ___________.
A. mutualistic.
B. parasitic.
C. competitive.
D. commensalisms.
ANSWER: A
42. Mycorrhizae are _________.
A. nutrients required by plants in relatively small amounts.
B. plants such as mistletoe that parasitize other plants.
C. cells that control evaporation of water from leaves.
D. associations of roots with beneficial fungi.
ANSWER: D
43. Which of the following correctly matches an organelle with its function?
A. Mitochondrion - Cellular respiration.
B. Nucleus - Photosynthesis.
C. Ribosome - Manufacture of lipids.
D. Lysosome - Movement.
ANSWER: A
44. Membrane bound vesicles, lysosomes are produced by __________.
A. ribosomes.
B. golgi apparatus.
C. endoplasmic reticulum.
D. mitochondria.
ANSWER: C
45. The movement of water across the tonoplast is mediated by ___________.
A. microchannels.
B. macrochannels.
C. aquaporins.
D. peroforins.
ANSWER: C
46. Tonoplast is a membrane surrounding _____________.
A. vacuoles.
B. golgi apparatus.
C. endoplasmic reticulum.
D. ribosomes.
ANSWER: A
47. RNA synthesised in the nucleus passes to the cytoplasm for use in protein synthesis through___________.
A. endocytosis.
B. exocytosis.
C. nuclear pores.
D. phagocytosis.
ANSWER: C
48. Asymbiotic N2 fixation is done by ____________.
A. azatobacter.
B. azospirillum.
C. rhizobacter.
D. rhizobium.
ANSWER: D
49. Sulphate assimilation in plant occurs in ____________.
A. chloroplasts.
B. mitochondria.
C. ribosomes.
D. peroxysomes.
ANSWER: A
50. The nutrients that are reclaimed after senescence are _______________.
A. calcium and phosphorus.
B. phosphorus and nitrogen.
C. nitrogen and calcium.
D. potassium and sodium.
ANSWER: B
51. Which of the following is the precursor for the synthesis of tetrapyroles?
A. Phytol.
B. Heme.
C. Phorbhobilinogen.
D. levulinic acid.
ANSWER: C
52. The rice fields are supplied with nitrogen by ________________.
A. azolla and nostoc.
B. frankia and paddy.
C. azolla and rice.
D. nostoc and rice.
ANSWER: A
53. The following are the nodule inducing bacteria except_________________.
A. rhizobium.
B. azospirillum.
C. bradyrhizobium.
D. nostoc.
ANSWER: D
54. The nod factors acquire high structural specificity by __________.
A. acylation.
B. phosphorylation.
C. acetylation.
D. sulfatation.
ANSWER: C
55. The following are required for nitrogen fixation except _____________ gene.
A. nif.
B. nod.
C. fix.
D. hox.
ANSWER: D
56. The gene required for the formation of nodules are called as _____________ gene.
A. nif.
B. nod.
C. nodulin.
D. fix.
ANSWER: C
57. Nitrogenase is extremely sensitive to _____________.
A. nitrogen.
B. sulfur.
C. oxygen.
D. carbon.
ANSWER: C
58. Which one of the following has got high affinity for oxygen?
A. Hemoglobin.
B. Myoglobin.
C. Leghemoglobin.
D. Oxyhemoglobin.
ANSWER: C
59. Sulfate is contained in the ______________.
A. cysteine and methionine.
B. glutathione.
C. thioredoxins.
D. phytochelatins.
ANSWER: D
60. Sulfate is probably taken up into the chloroplasts in counter exchange for _____________.
A. phosphate.
B. carbon.
C. malate.
D. glutamate.
ANSWER: A
61. The fixation of newly formed hydrogen sulphide requires ____________ acetylation.
A. glycine.
B. serine.
C. threonine.
D. tyrosine.
ANSWER: B
62. Inactivation of nitrate reductase is carried out by phosphorylation of ____________.
A. threonine.
B. glycine.
C. serine.
D. asparagine.
ANSWER: C
63. Immature leaf of plant falls down due to deficiency of _________.
A. zinc.
B. copper.
C. sulphur.
D. magnesium.
ANSWER: A
64. Important contribution of molybdenum is __________.
A. Chromosome condensation.
B. Nitrogen fixation.
C. Carbon fixation.
D. Flower growth.
ANSWER: B
65. In plants a common symptom caused by deficiency of P, K, Ca and Mg is the _________.
A. poor development of vasculature.
B. formation of anthocyanin.
C. bending of leaf tip.
D. appearance of dead necrotic areas.
ANSWER: D
66. In which of the following nitrogen is not a constituent?
A. Idioblast.
B. Bacterio chlorophyll.
C. Invertase.
D. Pepsin.
ANSWER: A
67. Inorganic nutrients are present in the soil in the form of ____________.
A. molecules.
B. atoms.
C. electrically charged ions.
D. organic compounds.
ANSWER: C
68. Interval cork Apple/browning of cauliflower is deficiency symptom of ____________.
A. Mo.
B. B.
C. Cu.
D. Zn.
ANSWER: B
69. The factors which maintain low oxygen concentration in the nodule is controlled by __________.
A. variable permeability barrier in the nodule parenchyma.
B. leghemoglobin.
C. bacterial respiration constitutes major oxygen sink.
D. haemoglobin.
ANSWER: D
70. Which of the following is situated in the thylakoid membrane?
A. Chlorophyll a.
B. Chlorophyll b.
C. Xanthophyll.
D. Anthocyanin.
ANSWER: A
71. Beta carotene is ___________.
A. orange in colour.
B. water soluble.
C. made of isoprene units.
D. an alkaloid.
ANSWER: B
72. The skeleton of chlorophyll is made of a ______________.
A. pentanone.
B. tetrapyrrole.
C. perhydro phenanthrene.
D. hexagon.
ANSWER: B
73. The amount of chlorophyll accounts for _____________ % of the dry matter of leaves.
A. 1 to 2.
B. 2 to 3.
C. 3 to 4.
D. 4 to 5.
ANSWER: A
74. The degradation of chlorophyll takes place by _____________.
A. chitinase.
B. chlorophillase.
C. pectinase.
D. nuclease.
ANSWER: B
75. The export of reducing equivalents in chloroplast is controlled by ______________ shuttle.
A. malate.
B. aspartate.
C. citrate.
D. pyruvate.
ANSWER: C
76. The absorption maxima of photosystem II is ___________.
A. 680nm.
B. 700 nm.
C. 720 nm.
D. 740 nm.
ANSWER: A
77. The CO2 assimilation is called as ___________ reaction.
A. Hill.
B. light.
C. dark.
D. redox.
ANSWER: C
78. In photo respiratory pathway the reduction of hydroxyl pyruvate takes place in ___________.
A. chloroplast.
B. peroxysomes.
C. mitochondria.
D. vacuoles.
ANSWER: C
79. Rubisco is present in ___________.
A. chloroplast.
B. mitochondria.
C. peroxysomes.
D. cell wall.
ANSWER: A
80. Plants surviving in severe water shortage adopt ___________ metabolism.
A. C3.
B. C4.
C. CAM.
D. hormone.
ANSWER: C
81. Plastocyanin is a chloroplast protein present in _____________.
A. inner mitochondrial membrane.
B. outer mitochondrial membrane.
C. thylakoid lumen.
D. thylakoid membrane.
ANSWER: C
82. Which of the following amounts to 50% of the total soluble proteins?
A. Cytochrome.
B. Carboxylase.
C. Rubisco.
D. Oxygenase.
ANSWER: C
83. Anthocyanins are ___________.
A. flower pigments.
B. antioxidants.
C. defense substances.
D. antibiotics.
ANSWER: A
84. Photosystem I is __________.
A. located on the outer surface of thylakoid.
B. responsible for the evolution of molecular oxygen.
C. is involved in cyclic and noncyclic phosphorylation.
D. is lighter fraction.
ANSWER: A
85. The most striking metabolic feature of CAM plant in night is the formation of _____________ acid.
A. citric.
B. isocitric.
C. malic.
D. none of the above.
ANSWER: C
86. Oxygen binding plant protein is ______________.
A. leg haemoglobin.
B. haemoglobin.
C. Cytokinin.
D. Auxin.
ANSWER: A
87. Which of the following is known as the ureide transporter?
A. Soy bean.
B. Castor bean.
C. Cucumber.
D. Mint.
ANSWER: A
88. Photorespiration does not occur in C4 plants because _________________.
A. they will not utilise oxygen.
B. they will not evolve carbondioxide.
C. there is no photorespiring apparatus.
D. there is no intermediate.
ANSWER: D
89. The substrate analogue of glutamate which serve as herbicide is ____________.
A. glufosinate.
B. chlorate.
C. glyphosate.
D. DDT.
ANSWER: A
90. Chloroplast contains the following translocator except __________________.
A. alpha ketoglutarate.
B. glutamate.
C. glutamine.
D. serine.
ANSWER: C
91. One molecule of oxygen fixed by RUBISCO is equivalent to ____________ ATP.
A. 8.25.
B. 8.
C. 10.
D. 11.
ANSWER: A
92. Calvin was awarded with nobel prize in _______________.
A. 1959.
B. 1960.
C. 1961.
D. 1962.
ANSWER: C
93. PS I participate in __________.
A. glycolysis.
B. TCA cycle.
C. cyclic photophosphorylation.
D. electron transport system.
ANSWER: C
94. Repetitive addition of C5 units is carried out by ______________.
A. prenyl transferases.
B. IPP isomerase.
C. thiolase.
D. HMG CoA reductase.
ANSWER: A
95. Which one of the following is not a day neutral plant?
A. Snapdragon.
B. Cucumber.
C. Corn.
D. Spinach.
ANSWER: D
96. The energy for the formation of ATP and NADPH comes from the visible radiation of wavelength
______________ nm.
A. 200-700.
B. 400-700.
C. 300-700.
D. 400-600.
ANSWER: B
97. The hormone involved in seed germination is ____________.
A. auxin.
B. abscissic acid.
C. gibberellin.
D. ethylene.
ANSWER: C
98. The disordered morphogenesis of the plant is due to _____________.
A. auxin.
B. gibberellins.
C. cytokinins.
D. 2, 4 D.
ANSWER: D
99. Stem elongation is induced by ____________.
A. auxin.
B. ethylene.
C. gibberellins.
D. absicissic acid.
ANSWER: C
100. The water balance of the plant is maintained by ____________.
A. gibberellin.
B. IAA.
C. cytokine.
D. absicissic acid.
ANSWER: A
101. The senescence alters which of the following?
A. Phenyl propanoid metabolism.
B. Protein metabolism.
C. Hormone metabolism.
D. All the above.
ANSWER: D
102. The impact of senescence on photosynthesis is ____________.
A. increase in photosynthesis.
B. decrease in photosynthesis.
C. constant photosynthesis.
D. no photosynthesis.
ANSWER: B
103. Which hormone is a promoter of senescence?
A. Abscissic acid.
B. Ethylene.
C. Cytokinin.
D. Auxin.
ANSWER: B
104. The way by which the plant cells undergo abscission is ______________.
A. autophagy.
B. tracheid differentiation.
C. formation of cereal endosperm.
D. DNA laddering.
ANSWER: D
105. Which is the late event of senescence of leaf?
A. Autophagy.
B. Wilting.
C. Apoptosis.
D. Tracheid differentiation.
ANSWER: B
106. When a plant structure such as a leaf is injured, it produces ______ that may cause the part to age and drop off.
A. cytokinins.
B. ethylene.
C. auxins.
D. abscisic acid.
ANSWER: B
107. Most plants flower when _________.
A. the soil reaches a certain temperature.
B. the days are of right length.
C. a certain number of days have passed since they last flowered.
D. the nights are of right length.
ANSWER: D
108. A certain short-day plant flowers when days are less than 12 hours long. Which of the following would cause it to
flower?
A. a 9-hour night and 15-hour day with 1 minute of darkness after 7 hour.
B. a 8-hr day and 16-hour night with a flash of white light after 8 hr.
C. a 13-hour night and 11-hour day with 1 minute of darkness after 6 hr.
D. a 12-hour day and 12-hour night with a flash of red light after 6 hr.
ANSWER: C
109. A chemical change in a substance called phytochrome ___________.
A. causes a plant to bend toward light.
B. triggers fruit drop.
C. enables a plant to respond to the presence of light.
D. is responsible for gravitropism.
ANSWER: C
110. Which of the following is pre-granal, immature chloroplasts?
A. Etioplast.
B. Leucoplast.
C. Amyloplast.
D. None of the above.
ANSWER: A
111. The roots of many aquatic plants have special structures that project above the surface of the water. Which of the
following is the most logical function of these structures?
A. obtaining carbon dioxide for photosynthesis.
B. nitrogen fixation.
C. obtaining oxygen for the roots.
D. transpiration.
ANSWER: C
112. In the autumn, the amount of ______________ increases and the amount of ___________ decreases in fruit and
leaf stalks, causing a plant to drop fruit and leaves.
A. ethylene, auxin.
B. gibberellins, abscisic acid.
C. cytokinin, abscisic acid.
D. auxin, ethylene.
ANSWER: A
113. Ethylene is synthesized from _______________.
A. glutathione.
B. adenosyl methionine.
C. methionine.
D. threonine.
ANSWER: B
114. IAA synthesis is down regulated by ___________.
A. ethylene.
B. gibberellin.
C. ABA.
D. cytokinin.
ANSWER: B
115. Terpenoid is synthesised via ____________.
A. geranyl gerany diphosphate.
B. geranyl phosphate.
C. isopentenyl pyrophosphate.
D. isopentenyl phosphate.
ANSWER: C
116. Vernalisation process is carried out by ___________.
A. cytokinin.
B. gibberellic acid.
C. ethylene.
D. abscissic acid.
ANSWER: B
117. The key enzyme in terpenoid pathway is ____________.
A. geranyl geranyl diphosphate synthase.
B. phytoene synthase.
C. phytoene saturase.
D. lycopene cyclise.
ANSWER: A
118. Coiling of garden pea tendrils around any support is an example of _________.
A. thermotaxis.
B. thigmotaxis.
C. thigmonasty.
D. thigmotropism.
ANSWER: D
119. Which one of the followings is a gaseous plant hormone?
A. Ethylene.
B. Gibberellin.
C. IAA.
D. Abscisic acid.
ANSWER: A
120. The annular and spirally thickened conducting elements generally developed in the protoxylem when the root or
stem is _________.
A. elongating.
B. maturing.
C. differentiating.
D. widening.
ANSWER: C
121. In response to microbial infection plants form _________________.
A. elicitors.
B. phytoalexin.
C. coiine.
D. nicotine.
ANSWER: B
122. The precursor of phytochelatin is __________________.
A. glutathione.
B. serine.
C. glycine.
D. proline.
ANSWER: A
123. Heavy metal detoxification is carried out by _______________.
A. methionine.
B. glutathione.
C. phytochelatins.
D. cysteine.
ANSWER: C
124. Cytokinin is responsible for ______________.
A. cell division.
B. stem elongation.
C. callus induction.
D. fruit ripening.
ANSWER: A
125. The following are known as phenyl propanoids except ________________.
A. flavonoids.
B. tannins.
C. stillbenes.
D. terpenoids.
ANSWER: A
126. Which of the following is not true about secondary metabolites?
A. They increase during biotic and abiotic stress.
B. The secondary metabolites are vital in plant host recognition.
C. These are not inactivated by microbial pathogens.
D. They show biological activity towards other species at physiologically relevant concentration.
ANSWER: C
127. The pyridine ring containing alkaloid is _________.
A. coniine.
B. nicotine.
C. cocaine.
D. atropine.
ANSWER: B
128. The substance which helps in jelly preparation is _______________.
A. starch.
B. cellulose.
C. pectin.
D. agar.
ANSWER: C
129. The most common free sterols of plant plasma membrane are the following EXCEPT _______________.
A. campesterol.
B. cholesterol.
C. stigmasterol.
D. steroids.
ANSWER: D
130. The first edible vaccine produced is ________________.
A. tomato.
B. potato.
C. cabbage.
D. brinjal.
ANSWER: B
131. Peppermint contains the terpene ______________.
A. limonene.
B. menthol.
C. carvone.
D. amyrin.
ANSWER: B
132. The applications of alkaloids are following except____________________.
A. models for modern synthetic drugs.
B. geopolitics.
C. nonsexual signaling.
D. chemical defense.
ANSWER: C
133. Which of the following is used as potent anticancer agent?
A. Caffeine.
B. Camptothecin.
C. Quinine.
D. Nicotine.
ANSWER: B
134. Which of the following is an antineoplastic agent?
A. Vinblastin.
B. Ajmalicine.
C. Atropine.
D. Cocaine.
ANSWER: A
135. The UV protectant flavonoid is _______________.
A. kaempferol.
B. pelargonidine.
C. delphinidine.
D. thiobine.
ANSWER: C
136. The sesquiterpenoid contains __________ carbons.
A. 20.
B. 10.
C. 25.
D. 15.
ANSWER: D
137. Which of the following is not related to terpenoid biosynthesis?
A. Synthesis of fundamental precursor IPP.
B. Repetitive addition of IPP.
C. Formation of terpenoid skeletons.
D. Elimination of monoterpenes.
ANSWER: D
138. Which of the following movements is not caused by physiological activities of living cells?
A. Growth.
B. Variation.
C. Curvature.
D. Hydroscopic.
ANSWER: D
139. Plants exhibit heat injury upon exposure to _____________ light.
A. UV.
B. visible.
C. infra-red.
D. none of the above.
ANSWER: C
140. The compartment where terpenoid biosynthesis takes place is _______________.
A. glandular trichomes.
B. secretory cavities of leaves.
C. roots.
D. glandular epidermis of flower petals.
ANSWER: C
141. The discovery of _________ effect showed the existence of two photochemical processes.
A. Emerson.
B. Tyndall.
C. Raman.
D. Tanada.
ANSWER: A
142. The first committed step in the flavonoid biosynthesis is catalysed by ______________.
A. DMI dehydratase.
B. chalcone synthase.
C. vesitone reductase.
D. NADPH reductase.
ANSWER: B
143. Alkaloids are mostly formed from _______________.
A. L - amino acid.
B. D - amino acid.
C. Both L and D aminoacids.
D. aminoglycans.
ANSWER: A
144. Codiene is obtained from __________________.
A. Centaurea dealbata.
B. Elcholtzia stauntonii.
C. Rauwolfia serpentine.
D. Coryphantha vivipara.
ANSWER: C
145. Morphine is obtained from _________________.
A. Sphaeralcea grossulariifolia.
B. Papaver somniferam.
C. Senecio plattenensis.
D. Arisaema triphyllum.
ANSWER: B
146. Which one of the following is not a terpenoid?
A. Taxol.
B. Sirenin.
C. Artemisnin.
D. Nicotine.
ANSWER: D
147. Gibberellin was discovered by ______________.
A. Kurosowa.
B. Darwin.
C. Went and Thiaman.
D. Kogl.
ANSWER: A
148. Senescence is accompanied by _____________.
A. fruit ripening.
B. increase in the photosynthesis.
C. metabolism of nucleic acids.
D. synthesis of chlorophyll.
ANSWER: A
149. When auxin/cytokinin ratio is high, ____________ are formed.
A. roots.
B. shoots.
C. callus.
D. leaves.
ANSWER: A
150. Hormone auxin brings about ________________.
A. stem elongation.
B. callus initiation.
C. cell division.
D. tip elongation.
ANSWER: D
Staff Name
Dr. BALAMBIGAI N .