Competitive Exams: Botany MCQs (Practice-Test 41 of 104)

  1. Wheat crop field infected with hill bunt often stinks. The foul odour is due to the presence of

    1. Methane in infected part

    2. Hydrogen Sulphide in spore mass

    3. Trim ethylamine in spore mass

    4. Alcohol in feted plants

  2. The Ear cockier of wheat can be differentiated from Molya disease of wheat by the fact that in the former

    1. Plants become dwarf, stem and leaves become twisted spike lets get distorted and grains get replaced by brown stony structures

    2. Plants become pale, leaves turn yellow with reddish lip, roots get matted and fail to ear

    3. Root tips swell and cyst adheres to roots that turn brown and fall

    4. Show hypertrophy of stern and leaves and roots swell

  3. The toxic substance produced by the pathogen causing Brown leaf spot of rice, harming seedlings reducing respiration of the host is

    1. Piricularian

    2. A-Picolinic acid

    3. Cochliobolin

    4. Ferulic acid

  4. Which one of the following diseases of rice is not caused by microbe?

    1. Tip burn of paddy

    2. Stem rot of paddy

    3. False smut of paddy

    4. Blast disease of rise

  5. Which of the following pairs are correctly matched? Disease Causal organism

      • Kamal bunt of wheat
      • Fungus
      • Khaira disease of rice
      • Bacterium
      • Fiji disease of sugarcane
      • Virus
      • Purple top of potato
      • Mycoplasma

    Select the correct answer from the codes given below:

    1. 1, 2 and 4

    2. 2, 3 and 4

    3. 1, 3 and 4

    4. 1, 2 and 3

  6. A collateral host is

    1. Crop host

    2. Additional plant on which life cycle is completed

    3. Grass host other than main host

    4. Alternate host

  7. Match List I with List II and select the correct answer using the codes given below the lists:

    List-I (Disease) List-II (Pathogen)
    1. Baterial blight of paddy

    2. Brown rot of potato

    3. Tundu disease of wheat

    4. Fire blight of apples

    1. Pseudomonas

    2. Corynebacterium

    3. Erwinia

    4. Xanthomonas

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 4
      • 4
      • 1
      • 2
      • 3
      • 3
      • 2
      • 1
      • 4
      • 2
      • 3
      • 4
      • 1
  8. Match List I with List II and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Microcosm

    2. Ecosystem

    3. Biocoenosis

    4. Geobicoenosis

    1. Tansley

    2. Mobius

    3. Forbes

    4. Sukachev

    • A
    • B
    • C
    • D
      • 1
      • 3
      • 2
      • 4
      • 2
      • 1
      • 3
      • 4
      • 1
      • 2
      • 3
      • 4
      • 3
      • 1
      • 2
      • 4
  9. Conservation of plant diversity is a/an

    1. Aesthetic necessity

    2. Economic necessity

    3. Genetic necessity

    4. Environmental necessity

  10. Which one of the following pairs is correctly matched?

      • Chryanthemum
      • Natural parathyroid
      • Leucaena
      • Dye
      • Acacia
      • Essential oil
      • Casuraina
      • Fodder
  11. Saffron is obtained form

    1. Anthers

    2. Styles and stigmas

    3. Perianth

    4. Petals

  12. Which one of the following algae has the potential to be an important source of edible protein?

    1. Spirulina

    2. Porphyra

    3. Cephaleuros

    4. Spirogyra

  13. Match List I (Plant names) with List II (Parts of fruits usually eaten) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Pyrus malus

    2. Mangifera indica

    3. Litchi chinensis

    4. Punica granatum

    1. Fleshy aril

    2. Fleshy thalamus

    3. Fleshy mesocarp

    4. Endosperm

    5. Jucy outer seed coat

    • A
    • B
    • C
    • D
      • 2
      • 3
      • 4
      • 1
      • 1
      • 2
      • 3
      • 5
      • 4
      • 3
      • 1
      • 5
      • 2
      • 3
      • 1
      • 5
  14. A particular vegetation zone in the Himalyas, dominated by the coniferous speckles is called

    1. Tropical

    2. Temperate

    3. Sub-alpine

    4. Alpine

  15. Which one of the following statements is appropriate for the Red Data Book?

    1. It gives data on species threatened with extinction

    2. It is a list of plants and animals is Res Sea

    3. It provides data on effect of red light on photosynthesis

    4. It is the list of red-pigmented plants