Competitive Exams: Botany MCQs (Practice-Test 95 of 104)

  1. Match List I with List II and select the correct answer

    List-I List-II
    1. Medicago sativa

    2. Tabebuia chrysantha

    3. Sesbania cannabina

    4. Derris elliptica

    1. Fodder

    2. Ornamental

    3. Biofertilizer

    4. Insecticide

    • A
    • B
    • C
    • D
      • 2
      • 1
      • 3
      • 4
      • 1
      • 2
      • 3
      • 4
      • 1
      • 3
      • 2
      • 4
      • 1
      • 2
      • 4
      • 3
  2. The alkaloid emetine is extracted from the

    1. Seeds of Strychnos

    2. Roots of Aconitum

    3. Seeds of Datura

    4. Roots of Cephalous

  3. ‘Triphala’ powder is prepared from

    1. Terminalia belerica, T. Chebula and T. Tomentosa

    2. Terminalia belerica, T. Chebula and phyllanthus emblica

    3. Terminalia chebula, Phyllanthus emblica and Diospyros melanoxylon

    4. Terminalia chebula, buchanania lanzan and emblica officinalis

  4. Germplasm Banks also preserve rare genotypes for

    1. Breeding and improvement

    2. Cultivation on large scale

    3. Tracing the history of evolution

    4. Chromosome study and phylogeny of cyto-types

  5. Unforeseen detrimental consequences of an environmental modification are described as

    1. Sub-critical inputs

    2. Non-critical inputs

    3. Backlashes

    4. Critical inputs

  6. Production of androgenic haploids using tissue culture technique was reported for the first time in

    1. Solanum

    2. Capsicum

    3. Hyoscyamus

    4. Datura

  7. Which one of the following is a class of cell wail degrading enzymes and is used for the purpose of protoplast isolation?

    1. Nucleases

    2. Lipases

    3. Cellulases

    4. Peroxidases

  8. For energy plantation, selection of suitable species is the most crucial aspect. Consider the following statements in this regard: The species must have

    1. Good coppicing ability.

    2. High calorific value of wood.

    3. Economic importance.

    4. Capacity for early flowering.

    Of these statements

    1. 1 and 2 are correct

    2. 2 and 3 are correct

    3. 3 and 4 are correct

    4. 1, 2, 3 and 4 are correct

  9. Consider the following statements: Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to

    1. Resist drought and increase absorptive area.

    2. Tolerate extremes of ph.

    3. Resist disease infestation

    Of these statements

    1. 2 and 3 are correct

    2. 1 and 2 are correct

    3. 1 and 3 are correct

    4. 1, 2 and 3 are correct

  10. Which one of the following microbes provides a natural system for gene transfer to produce transgenic plants?

    1. E. Coil

    2. Pseudomonas syringae

    3. Agrobacterium tumefaciens

    4. Bacillus thuringiensis

  11. Artificial seeds are produced by

    1. Immobilization of somatic embryos

    2. Biotransformation

    3. Biosynthesis

    4. Enzymatic isolation

  12. Allelopathic effect of excretions of one plant species on another associated plant species is related to

    1. Healing of wounds

    2. Inhibition of growth

    3. Promotion of closer association

    4. Prevention of attack by pathogenic microbes.

  13. Which one of the following tree species is an actinorhizal nitrogen fixer?

    1. Lecaena leucocephala

    2. Acacia auriculiformis

    3. Prosopis juliflora

    4. Casuarina equisetifolia

  14. Which of the following pairs of plant categories and habitat types are correctly matched?

      • Sociophytes:
      • Shady
      • Heliophytes:
      • Sunny
      • Psammophytes
      • Sandy

    Select the correct answer using the codes given below:

    1. 1, 2 and 3

    2. 1 and 2

    3. 1 and 3

    4. 2 and 3

  15. Greenhouse gases are called as such because they

    1. Prevent the escape of heat waves reradiated from the earth's surface

    2. Are produced in greenhouses

    3. Are used in warming plant growth chambers

    4. Help in maintaining atmospheric O2 and CO2 balance