Competitive Exams: Botany MCQs (Practice-Test 61 of 104)

  1. The top five crops, as on date, in terms of annual world production in millions of metric tons belong to the families

    1. Gramineae and Solanaceae

    2. Gramineae and Cruciferae

    3. Gramineae and Leguminasae

    4. Leguminosae and Malvaceae

  2. Edible, freshwater algae would include

    1. Porphyra and Chiorella

    2. Spirulina and Lanunaria

    3. Microcystis and Chondrus

    4. Chlorella and Spirulina

  3. Match List I with List II and select the correct answer:

    List-I List-II
    1. Ficus benghalensis

    2. Melia azadirachta

    3. Cocos nucifera

    4. Hevea brasiliensis

    1. Fibre

    2. Pesticide

    3. Latex

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 1
      • 1
      • 1
      • 2
      • 3
      • 3
      • 3
      • 1
      • 2
      • 3
      • 2
      • 1
      • 3
  4. Consider the following statements: Tissue culture is recommended for

    1. Multiplication of elite genotypes

    2. Developing virus-free plants

    3. Production of secondary metabolites

    4. Induction of polyploidy

    5. Of useful trees

    Of this statements

    1. 1, 2 and 4 are correct

    2. 1, 2 and 3 are correct

    3. 1, 3 and 4 are correct

    4. 2, 3 and 4 are correct

  5. Nitrogen fixation occurs in

    1. Some herbaceous plants and legumes

    2. Legumes and some bacteria

    3. Some bacteria, cyan bacteria and legumes

    4. All green plants

  6. Climax communities

    1. Are more diverse than pioneer communities

    2. Are less stable than pioneer communities

    3. Have greater entropy than pioneer communities

    4. Have a larger number but fer species of plants than pioneer communities

  7. In the grasslands, trees do not replace the grasses as part of an ecological succession because of

    1. Insects and fungi

    2. Limited sunlight and paucity of nutrients

    3. Water limits and fire

    4. Cool temperatures and good soil

  8. Which one of the following statements correctly defines the term biomass in forestry?

    1. The dry weight of the crop when it has attained the maximum growth

    2. The dry weight of the crop when it has attained the maximum height

    3. The dry weight of the crop when the spread of its canopy is maximum

    4. The dry weight of the standing crop at any moment of time

  9. How does acid precipitation (acid rain) affect plants?

    1. It releases H + ions, thereby increasing the of rate photophosphorylation in green cells

    2. It precipitates organic acids in palisades cells of leaves, thereby inhibiting respiration

    3. It injures foliage leading to reduction in photosynthesis, biomass and occasionally death

    4. It precipitates toxic nutrients in soil leading to growth inhibition in trees

  10. Which one of the following pairs serve as biofertilizers?

    1. Alb go and Nostoc

    2. Frankia and Nostoc

    3. Pseudomonas and E. Coil

    4. Aspergillus's and Actinomycetes

  11. Mycorrhizal fungi mobilize nutrients from soils to roots of plants. The nutrient in question is

    1. Organic acid

    2. Phosphorus

    3. Manganese

    4. Potassium

  12. ‘DNA fingerprinting’ has proved to be useful in forensic science. It involves the use of

    1. Minisatellites

    2. Nibosomal RNA

    3. cDNA

    4. Bacterial DNA

  13. Many herbs of medicinal value can be obtained on a commercial scale by

    1. Developing a quick rooting and multiplying medium for vegetative buds

    2. Long-term hybridization process for increasing fertility of seeds

    3. Physiological research for finding the cause of non-viability of seeds

    4. Using the hormone dipping system for cutting

  14. A recently discovered anti-cancer drug is obtained from

    1. Taxus

    2. Tagetes

    3. Tamaric

    4. Thea

  15. Which one of the following statements is true in respect of India regarding the Dunkel proposals on plant Breeder Rights and Patent Law?

    1. The plant breeder's rights are available for a new variety produced, but these will be adversely affected by the Dunkel proposals

    2. The Indian Patent Law provides for process patent, but not for product patent; Dunkel proposals would require introduction of product patent

    3. Dunkel proposals will not suit India, because they will not allow plant breeder's rights to Indian plant breeders

    4. Dunkel proposals provide for farmers rights ‘but not for plant breeder’ rights