Competitive Exams: Botany MCQs (Practice-Test 44 of 104)

    • Assertion (A): Exocrine producing desert plants are spaced distantly.
    • Reason (R): Allelopathy causes growth inhabitation.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R ate true but R is not a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The vesicular arbuscular mycorrhizae are helpful in volatilization and uptake of phosphate.
    • Reason (R): Phosphate in soil exists only in insoluble form.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R ate true but R is not a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Lantana cemara is an exotic plant introduced in India.
    • Reason (R): Introduced plants are always harmful in a new area.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R ate true but R is not a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

  1. The Precambrian red rock indicates the

    1. Presence of the free oxygen

    2. Absence of free oxygen

    3. Presence of hydrogen

    4. Presence of water

  2. The following four scientists are associated with the work on organic evolution:

    1. Gregor Mendel

    2. Charles R. Darwin

    3. G. G. Simpson

    4. J. B. S. Haldane

    The chronological order of their appearance in the scientific field is

    1. 2, 1, 3, 4

    2. 2, 1, 4, 3

    3. 3, 4, 1, 2

    4. 4, 1, 2, 3

  3. The principles which bind all living systems together are

    1. Laws of thermodynamics

    2. Laws of heredity

    3. Mechanisms of photosynthesis

    4. Modes of germination

  4. The first intermediate electron carrier molecule formed during the origin of Life was

    1. Chlorophyll

    2. Poiphyrin

    3. Phytochrome

    4. Protochiorphyll

  5. In which type of stole, does phloem surround the xylem both externally and internally?

    1. Amphiphloic siphonostele

    2. Ectophtoic siphonostele

    3. Haplostele

    4. Actinostle

  6. Which one of the following is not concerned with the permanent closure of stomata present on photosynthesizing plant organs in some desert plants?

    1. The closure is caused by additional thickening and customization of the guard cell walls

    2. Blocking of the sunken stomata from the exterior by the resinous masses

    3. Increase of turgor pressure in the guard cells of sunken stomata

    4. Blocking of the stomata by wax layer

  7. The nomenclatural type of a specimen selected by the author as substitute of a lost material on which the name of the taxon is based is called

    1. Syntype

    2. Neotype

    3. Lectotype

    4. Paratype

  8. The Amaryllidaceous is distinguished from liliaceous on the basis of

    1. Regular timorous flower with superior ovary

    2. Umbellate inflorescence, regular timorous flower with superior ovary

    3. Umbellate inflorescence, regular flower and inferior ovary

    4. Umbellate inflorescence and inferior ovary

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

    List-I List-II
    1. Asclepiadaceac

    2. Orchidaceae

    3. Solanaceae

    4. Umbelliferae

    1. Obliquely placed gynoecium's

    2. Stamina corona

    3. Polonium

    4. Inferior ovary

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

    List-I List-II
    1. Order

    2. Tribe

    3. Sub-order

    4. Sub-family

    1. -ineae

    2. -oideae

    3. -ales

    4. -eae

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 1
      • 2
      • 3
      • 2
      • 4
      • 1
      • 2
      • 1
      • 3
      • 4
      • 4
      • 2
      • 3
      • 1
  11. Taxonomic studies have been divided into four successive phase:

    1. Exploratory phase

    2. Consolidation phase

    3. Biosystematics phase

    4. Encyclopedic phase ‘Omega’ Taxonomy, accordint to Turrill, is made of

      1. 1 and 2

      2. 1 and 3

      3. 2 and 4

      4. 3 and 4

  12. Which one of the following coniferous members is a ‘living fossill’

    1. Cedrus

    2. Pinus

    3. Picea

    4. Metasequoia