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BOTANY

 Botany MCQs

UPSC Exam Syllabus- Botany
​1. The term heteroecism means : 
(a). Presence of heterothalism 
(b). Presence of heterokaryons 
(c). Completion of life cycle on two hosts by a pathogen. 
(d). None of these 
Ans: c
 
2. In Kreb's cycle, co-enzyme for succinic acid dehydrogenase enzyme is 
(a). NAD
(b). NADP
(c). FAD
(d). TPP 
Ans: c
 
3. During the formation of RNA, at which site RNA polymerase binds to a DNA molecule ? 
(a). Promoter  
(b). Exon 
(c). Intron  
​(d). None of the above 
Ans: a
 
4. Clamp connections are present in : 
(a). Basidiomycetes
(b). Oomycetes 
(c). Ascomycetes 
(d). Deuteromycetes 
Ans: a
 
5. Gram staining is a/an 
(a). Simple staining
(b). Differential staining 
(c). Complex staining
(d). Acid fast staining 
Ans: b
 
6. According to classification of enzymes, carboxylase enzyme belong to the class of  enzyme 
(a). Lysases
(b). Hydrolases
(c). Isomerases
(d). Ligases 
Ans: a
 
7. Which of the following viruses is largest in size ? 
(a). Rubella
(b). Bacteriophage
(c). Cyanophage
(d). T.M.V. 
Ans: d
 
8. The process of making germ free milk by heating it at 62.8°C temperature for 30 minutes is called :  
(a). Evaporation 
(b). Pasteurization 
(c). Absorption 
(d). Condensation 
Ans: b
 
9. ‘Red-rust’ disease of Tea is caused by 
(a). Cephaleuros 
(b). Cystopus 
(c). Puccinia 
(d). Alternaria
Ans: a

10. Who was the first scientist to prove that O2 is evolved in photosynthesis during light reaction ? 
(a). Black Man
(b). Robert Hill
(c). Arnon
(d). Emerson 
Ans: b
 
11. Chantransia stage is found in the life cycle of which alga ? 
(a). Polysiphonia 
(b). Batrachospermum 
(c). Vaucheria 
(d). Ectocarpus 
Ans: b
 
12. The most complex reproductive bodies are found in : 
(a). Ulotrichales
(b). Volvocales
(c). Chaetophorales
(d). Charales 
Ans: d
 
13. Hormogonia are present in which of the following ? 
(a). Ulothrix
(b). Spirulina
(c). Zygnema
(d). Nostoc 
Ans: d
 
14. Which of the following alga is used as a source of Iodine ? 
(a). Laminaria
(b). Polysiphonia
(c). Nostoc
(d). Cladophora 
Ans: a
 
15. Retort cells are found in which of the following ? 
(a). Riccia
(b). Marchantia
(c). Sphagnum
(d). Polytrichum 
Ans: c

16. Chlorophyll-d is found in which of the following ? 
(a). Xanthophyceae
(b). Rhodophyceae 
(c). Phaeophyceae 
(d). Chlorophyceae 
Ans: b
 
17. Which of the following algae can be used in space missions ? 
(a). Nitella
(b). Anabaena
(c). Volvox
(d). Chlorella 
Ans: d
 
18. Septate rhizoids are found in 
(a). Riccia
(b). Anthoceros
(c). Polytrichum
(d). Marchantia 
Ans: c
 
19. Which bryophyte among the following is most economically important ? 
(a). Funaria
(b). Sphagnum
(c). Riccia
(d). Marchantia 
Ans: b
 
20. Agar-agar is obtained from 
(a). Gelidium
(b). Chaetomorpha
(c). Codium
(d). Laminaria 
Ans: a

21. Most of the families of primitive angiosperms belong to the order : 
(a). Magnoliales
(b). Asterales
(c). Orchidales
(d). Polemoniales 
Ans: a
 
22. The term 'Taxonomy' was coined by 
(a). Braun
(b). Augustin Pyramus de Candolle
(c). Bentham
(d). Thorne 
Ans: b
 
23. Of which genus 'Cyathium inflorescence' is the characteristic ? 
(a). Brassica
(b). Hibiscus
(c). Citrus
(d). Euphorbia 
Ans: d
 
24. Caryopsis is not found in the genus : 
(a). Oryza
(b). Triticum
(c). Pisum
(d). Avena 
Ans: c
 
25. In Caryophyllaceae the placentation is 
(a). Axile
(b). Parietal
(c). Marginal
(d). Free central
Ans: d 
 
26. The botanical name of larkspur is 
(a). Delphinium
(b). Paeonia
(c). Viola
(d). Ranunculus 
Ans: a
 
27. Verticillaster inflorescence is not found in : 
(a). Salvia
(b). Ficus
(c). Ocimum
(d). Lamium 
Ans: b
 
28. 'The Families of Flowering Plants' was written by 
(a). Hutchinson
(b). Angler
(c). Mathur
(d). Bentham
Ans: a 
 
29. Beta vulgaris, an important source of sugar, belongs to the family : 
(a). Apocyanaceae 
(b). Chenopodiaceae 
(c). Asclepiadaceae
(d). Brassicaceae 
Ans: b
 
30. Asafoetida is obtained from : 
(a). Roots
(b). Stem
(c). Leaves
(d). Bark 
Ans: a

31. The living element in xylem is : 
(a). Tracheids
(b). Vessels
(c). Xylem fibres
(d). None of these 
Ans: d
 
32. An example of Monocot showing abnormal secondary growth is 
(a). Allium
(b). Dracaena
(c). Triticum
(d). Poa 
Ans: b

33. Lever mechanism of pollination is a characteristic feature of 
(a). Antirhinum
(b). Ficus
(c). Thalictrum
(d). Salvia 
Ans: d
 
34. Cystolith is made up of 
(a). Calcium carbonate
(b). Sodium hydroxide 
(c). Ammonium chloride
(d). Ammonium phosphate 
Ans: a
 
35. Which of the following has the prop roots ? 
(a). Maize
(b). Orchid
(c). Wheat
(d). Banyan 
Ans: d
 
36. Which of the following families forms pollinia ? 
(a). Cactaceae
(b). Ranunculaceae
(c). Asclepiadaceae
(d). Poaceae 
Ans: c
 
37. Which of the following is immediately surrounded by subsidiary cells ? 
(a). Stomatal opening
(b). Guard cells 
(c). Phloem 
(d). Xylem 
Ans: b
 
38. What is used as nutrition during microsporogenesis ? 
(a). Tapetum
(b). Epidermis
(c). Pollen grains
(d). Exine 
Ans: a
 
39. In which of the following, tetrasporic eight nucleate embryosac is found ? 
(a). Peperomia
(b). Oenothera
(c). Plumbago
(d). Paeonia 
Ans: c
 
40. Moisture absorbing Velamen is found in the roots of 
(a). Mango
(b). Ricinus
(c). Vinca
(d). Orchid 
Ans: d
 
41. Leptosporangiate condition is found in 
(a). Salvinia
(b). Marsilea
(c). Pteris
(d). All of these 
Ans: d
 
42. Endosperm in Gymnosperms is 
(a). Diploid
(b). Triploid
(c). Tetraploid
(d). Haploid 
Ans: d
 
43. Prokaryotic cells are not found in 
(a). Nostoc
(b). Cycas
(c). Bacteria
(d). Anabaena 
Ans: b
 
44. Diploxylic condition is found in 
(a). Cycas
(b). Lycopodium
(c). Selaginella
(d). Allium 
Ans: a

45. According to some findings the reason for a continuous decrease in the population of vultures could be due to the consumption of which ? 
(a). Paracetamol
(b). Tetracyclin
(c). Diclophenac
(d). Pentacid 
Ans: c

46. Cycadeoidea was dominant flora of the era 
(a). Paleozoic
(b). Archaeozoic
(c). Coenozoic
(d). Mesozoic
Ans: d 
 
47. Stalked ovules were present in 
(a). Bennettitales
(b). Taxales
(c). Coniferales
(d). Cycadales 
Ans: a
 
48. Transfusion tissue is found in 
(a). Leaves of Selaginella
(b). Stem of Cycas  
(c). Leaflets of Cycas
(d). Stem of Selaginella 
Ans: c
 
49. Antherozoids large enough to be seen by naked eye are produced by 
(a). Cycas revoluta
(b). Pinus roxburghii  
(c). Ephedra foliata
(d). Gnetum latifolia 
Ans: a
 
50. A leaf bearing sporangia is called as 
(a). Ramentum
(b). Sporophyll
(c). Indusium
(d). Sorus 
Ans: b
​51. Fossils in which internal structures are best preserved are 
(a). Compressions
(b). Petrifications
(c). Incrustations
(d). Impressions 
Ans: b
 
52. The Rhynian flora is best seen in 
(a). Carboniferous period
(b). Silurian period 
(c). Triassic period
(d). Devonian period 
Ans: d
 
53. In Psilotum spore producing organs are called 
(a). Indusia
(b). Ramenta
(c). Sporophylls
(d). Synangia 
Ans: d
 
54. Carinal Canals are found in the stems of 
(a). Marsilea
(b). Selaginella
(c). Lycopodium
(d). Equisetum 
 Ans: d

55. Heterospory is not found in 
(a). Selaginella
(b). Lycopodium
(c). Marsilea
(d). Azolla 
Ans: b
56. Selaginella is known for 
(a). Transfusion tissue
(b). Carinal canals 
(c). Mucilage cells 
(d). Trabeculated endodermis 
Ans: d
 
57. Protocorm is found in 
(a). Selaginella
(b). Lycopodium
(c). Equisetum
(d). Marsilea 
Ans: b
 
58. Development of gametophyte from sporophyte without the formation of spores is called 
(a). Apospory 
(b). Tuber formation 
(c). Apogamy 
(d). Gemma formation 
Ans: a
 
59. Jute is obtained from 
(a). Cannabis sativa
(b). Linum usitatissimum  
(c). Yucca baccata 
(d). Corchorus capsularis 
Ans: d
 
60. Botanical name of the plant that yields para rubber is : 
(a). Hevea brasiliensis
(b). Ficus elastica  
(c). Ficus religiosa 
(d). Manihot glazovii 
 Ans: a

61. The centre of origin of Rice is supposed to be  
(a). Indian and Indo-china
(b). Africa 
(c). Germany 
(d). Indo-Malayan Region 
Ans: a
 
62. Coir is extracted from 
(a). Xylem
(b). Mesocarp
(c). Roots
(d). Phloem 
Ans: b
 
63. Which of the following is an essential oil ? 
(a). Mustard oil
(b). Khus oil
(c). Linseed oil
(d). Groundnut oil 
Ans: b
 
64. From which part of the plant saffron is obtained ? 
(a). Stigma and style tops
(b). Stamens 
(c). Sepals 
(d). Petals 
Ans: a
 
65. Kufri Jyoti is an improved variety of 
(a). Rice
(b). Wheat
(c). Soyabean
(d). Potato 
Ans: d

66. In Eukaryotes electron transport and oxidative phosphorylation takes place in 
(a). Outer membrane of mitochondria
(b). Inner membrane of mitochondria 
(c). Chloroplast 
(d). Cytoplasm 
Ans: b
 
67. The lac operon is induced by 
(a). Allolactose
(b). Galactose
(c). Co-repressor
(d). Glucose
Ans: a 
 
68. A polypeptide is assembled on 
(a). Nuclear membrane
(b). Golgi bodies 
(c). Ribosomes 
(d). Nuclear pores 
Ans: c
 
69. Which of the following is common name of ascorbic acid ?
(a). Vitamin B1
(b). Vitamin B2
(c). Vitamin B12
(d). Vitamin C 
Ans: d
 
70. Which of the following does not have nucleic acid ? 
(a). Mitochondria
(b). Nucleus
(c). Chloroplast
(d). Lysosomes 
Ans: d
 
71. 'Krantz anatomy' is found in
(a). Saprophytic plants
(b). C3 plants 
(c). C4 plants 
(d). All of the above 
Ans: c
 
72. Which Hormonal condition is responsible for the falling of leaves in plants ? 
(a). Decrease in Auxin concentration  
(b). Increase in Auxin cocentration 
(c). Decrease in Abscissic Acid concentration 
(d). Increase in Gibberellic Acid concentration 
Ans: a
 
73. Root pressure in plants is caused by 
(a). Passive absorption
(b). Active absorption 
(c). Increased rate of transpiration
(d). Both active and passive absorption 
Ans: b
 
74. The first carboxylation product of C3 plants is 
(a). 3-phosphoglyceric acid
(b). Oxaloacetic acid 
(c). Maleic acid 
(d). Phosphoglyceraldehyde 
Ans: a

75. Legume root nodules contain Leghaemoglobin. It's function is to regulate 
(a). Expression of nif-genes
(b). Denitrogenase activity 
(c). Oxygen concentration
(d). Nodule growth 
Ans: c
 
76. The concept of Ecosystem was put forth by 
(a). Clarke
(b). A.G. Tansley
(c). Woodbury
(d). H. Reiter 
Ans: b
 
77. Synchronisation of the phenological behaviour of the species and the different factors of the environment, is known as 
(a). Biological clock
(b). Normal clock 
(c). Anti-clock 
(d). Right clock 
Ans: a
 
78. The food chain starting from dead organic matter to micro-organisms is known as 
(a). Grazing 
(b). Detritus 
(c). Normal 
(d). None of the above 
Ans: b
 
79. Kaziranga National Park is famous for 
(a). Asiatic Lion 
(b). Indian Tiger 
(c). Bison 
(d). One-horned Rhinoceros
Ans: d 
 
80. The Earth Summit held at Rio-de-Janeiro in 1992 resulted in 
(a). Compilation of Red List
(b). IUCN 
(c). Convention of Biodiversity
(d). Establishment of Biosphere Reserve 
Ans: c

81. Which category of pyramid can never be inverted ? 
(a). Biomass
(b). Number
(c). Energy
(d). All of these 
Ans: c
 
82. Red Data Book gives information regarding 
(a). Threatened species
(b). Vulnerable species 
(c). Endangered species
(d). All of the above 
Ans: c
 
83. In the pyramid of numbers herbivores occupy :
(a). 1st position
(b). 2nd position
(c). 3rd position
(d). 4th position 
Ans: b

84. Which one of the following is the first National Park of India ? 
(a). Rajaji National Park
(b). Gir National Park 
(c). Corbett National Park
(d). Kaziranga National Park 
Ans: c
 
85. Which is the best method of separation of plasmid DNA and Bacterial Chromosomal   DNA ? 
(a). Ethidium bromide-caesium chloride density gradient centrifugation 
(b). X-ray diffraction technique  
(c). Colony hybridization 
(d). Western hybridization 
Ans: a
 
86. Restriction endonuclease enzyme was discovered by 
(a). Watson 
(b). W. Arber, H. Smith & D. Nathans 
(c). Crick 
(d). Hugo de Vries 
Ans: b
 
87. Which of the following is a non PCR based marker ? 
(a). RAPD
(b). AFLP
(c). SSR
(d). RFLP 
Ans: d
 
88. How many grams of IAA are needed to prepare a litre of 0.01 m solution of IAA (M.Wt. 175) ? 
(a). 175 g
​(b). 17.5 g
(c). 1.75 g
(d). 0.175 g 
Ans: c
 
89. Which one of the following was responsible for Bhopal Gas Tragedy ? 
(a). Carbon monoxide
(b). Sulphur dioxide 
(c). Methyl Isocynide
(d). Nitrus Oxide 
Ans: c
 
90. Which sequence is a palindrome ? 
(a) 5′ ACGGATTCGC 3'
(b) 5′ CCATT 3′  
(c) 5′ CCAGG 3′   
(d) 5′ AGGCCT 3′
Ans: d
 
91. Which of the following has triploid set (3x) of chromosomes in angosperm ? 
(a). Embryosac
(b). Nucellus
(c). Endosperm
(d). All of these 
Ans: c

92. The example of composite fruit is 
(a). Tomato
(b). Jack fruit
(c). Mango
(d). Apple 
Ans: b
 
93. Which of the following produces a synzoospore ? 
(a). Nostoc
(b). Oscillatoria
(c). Vaucheria
(d). Volvox 
Ans: c
 
94. How many nitrogen fixing genes have been reported in Klebsiella ? 
(a). 17 genes
(b). 27 genes
(c). 37 genes
(d). 07 genes
Ans: a 
 
95. Which of the following objective lens in a microscope is known as oil immersion lens ? 
(a). X 10
(b). X 40
(c). X 60
(d). X 100 
Ans: d
 
96. Who gave the ‘Fluid Mosaic Model’ of cell membrane ?  
(a). Robertson 
(b). Singer and Nicholson 
(c). Von Mohl 
(d). Camillo Golgi 
Ans: b
 
97. In which of the following conditions, the rate of transpiration will be maximum ? 
(a). Soil is wet and atmosphere is dry. 
(b). Soil is wet and atmosphere is humid. 
(c). Soil is dry and atmosphere is humid. 
(d). Both soil and atmosphere are dry. 
Ans: a
 
98. Which of the following type of genetic change can produce an onchogene ? 
(a). Gene amplification
(b). Missense mutation 
(c). Chromosomal translocation
(d). All of the above 
Ans: d

99. Pollination by wind is called __________ .
(A) Anemophily (B) Hydrophily (C) Zoophily (D) Entomophily
​Ans: A

100. The cell organelle known as “power houses” of the cell :
(A) Ribosome (B) Mitochondria
(C) Endoplasmic reticulum (D) Lysosome
​Ans: B

101. 
Mangrove plants meet high osmotic pressure in the soil, they overcome the problem of water uptake by
(A) accumulation of electrolytes in the vacuole of the cell
(B) increase in the root and shoot ratio
(C) reduce the respiration rate
(D) reduce the transpiration rate
Ans: A

102. Gymnosperms are
(A) open seeded plants
(B) closed seeded plants
(C) non-flowering plants 
(D) aquatic plants
Ans:
​A

103.
The nitrogen fixing bacterium present in the root nodules of leguminous Plant is
(A) salmonella (B) rhizobium
(C) clostridium (D) pseudomonas
Ans:
​B

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      • UPSC EXAM SYLLABUS- CHEMISTRY
      • UPSC EXAM SYLLABUS- GEOLOGY
      • UPSC EXAM SYLLABUS- CIVIL ENGINEERING
      • UPSC EXAM SYLLABUS- GEOGRAPHY
      • UPSC EXAM SYLLABUS- COMMERCE AND ACCOUNTING
      • UPSC EXAM SYLLABUS- ECONOMICS
      • UPSC EXAM SYLLABUS- ELECTRICAL ENGINEERING
      • UPSC EXAM SYLLABUS- HISTORY
      • UPSC EXAM SYLLABUS- LAW
      • UPSC EXAM- FREQUENTLY ASKED QUESTIONS (FAQs)
      • UPSC EXAM SYLLABUS- MANAGEMENT
      • UPSC EXAM SYLLABUS- MATHEMATICS
      • UPSC EXAM SYLLABUS- MECHANICAL ENGINEERING
      • UPSC EXAM SYLLABUS- MEDICAL SCIENCE
      • UPSC EXAM SYLLABUS- PHILOSOPHY
      • UPSC EXAM SYLLABUS- PHYSICS
      • UPSC EXAM SYLLABUS- POLITICAL SCIENCE AND INTERNATIONAL RELATIONS
      • UPSC EXAM SYLLABUS- PSYCHOLOGY
      • UPSC EXAM SYLLABUS- PUBLIC ADMINISTRATION
      • UPSC EXAM SYLLABUS- SOCIOLOGY
      • UPSC EXAM SYLLABUS- STATISTICS
      • UPSC EXAM SYLLABUS- ZOOLOGY
    • THE COMBINED GEOSCIENTIST AND GEOLOGIST EXAMINATION SYLLABUS
    • COMBINED MEDICAL SERVICES EXAMINATION SYLLABUS
    • JOINT ENTRANCE EXAMINATION
    • OPTIONAL SUBJECTS OF UPSC EXAM TOPPERS
    • UPSC- EXAM CENTRES
    • UPSC EXAM TIMETABLE/ PATTERN
    • UPSC EXAM BEGINNERS TIPS
    • COMBINED GRADUATE LEVEL EXAMINATION- SSC
    • OVERVIEW OF GATE EXAM
    • UPSC INDIAN FOREST SERVICE >
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- AGRICULTURE
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- AGRICULTURAL ENGINEERING
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- ANIMAL HUSBANDRY AND VETERINARY SCIENCE
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- BOTANY
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- CHEMISTRY
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- CHEMICAL ENGINEERING
      • GEN. STUDIES- INDIA PAGE 5
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- CIVIL ENGINEERING
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- FORESTRY
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- GEOLOGY
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- MATHEMATICS
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- MECHANICAL ENGINEERING
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- PHYSICS
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- STATISTICS
      • UPSC INDIAN FOREST SERVICE- SYLLABUS- ZOOLOGY
  • SITEMAP
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    • ANIMAL HUSBANDARY AND VETERINARY SCIENCE
    • ANTHROPOLOGY
    • GEOLOGY
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