Competitive Exams: Botany MCQs (Practice-Test 80 of 104)

  1. Which one of the following pairs is NOT correctly matched?

      • Elaeis guineensis
      • Edible oil
      • Manihot utilissima
      • Timber
      • Chenopidum ambrosiodes
      • Drugs
      • Chrysanthemum cineraria folium
      • Insecticide
  2. Androgenic haploids are most useful due to their

    1. high productivity

    2. Excessive vigor

    3. Homozygous stocks

    4. Beautiful foliage and flowers

    • Assertion (A): Lichens are good bioindicators among plants.
    • Reason (R): They are sensitive to common pollutants such as carbon monoxide and sulphur dioxide.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Mechanism of hyper parasitism can be employed to control many plant diseases.
    • Reason (R): Hyper parasitism helps the host plants to become highly resistant to the pathogen.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Apical dominance of terminal; bud inhabits or retards the growth of lateral buds.
    • Reason (R): The high concentration of auxin in apical buds is responsible for apical dominance.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Higher mitochondrial activity of the F1 hybrids can be used as biochemical criterion for the identification of hieratic combination.
    • Reason (R): Mitochondria are heritable entities and sites of cellular respiration and energy.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Generally site-specific crosses produce sterile individuals. The problem can be solved by protoplast fusion.
    • Reason (R): Fusion of protoplasts of somatic cells is difficult due to rigid cellulose walls and middle lamellae of pectic substances.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Genetic diversity is necessary of significant heterocyst but not sufficient to guarantee it.
    • Reason (R): Divergent parents my also produce poor hybrids in the presence of linkage and epitasis.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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 fruits of groundnuts are not nuts but underground pods.
    • Reason (R): The pods will not develop until the fertilized ovary is pushed under the soil.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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 removal of flowers and fruits has been found to defer or prevent senescence in several herbaceous annual grain crops.
    • Reason (R): Reproductive activity is the cause of senescence in such crops.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): A seedling grown in dark is larger than the seedling of the same species and same age grown in the presence of light.
    • Reason (R): Light inhibits stem elongation.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Most epiphytes face a situation of drought.
    • Reason (R): The epiphytic roots are hygroscopic because of special tissues, the velamen.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Wilt of cotton results from dislocation of the flow of plant nutrients through xylem vessels.
    • Reason (R): Physical obstruction of conducting tissues of toxin result in the wilting of cotton.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Sphagnum is considered to be a transition type between autocross and true mosses.
    • Reason (R): Sphagnum, like Autocross and true mosses, has a bulbous foot and prolonged seta.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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): Most lections are a class of proteins.
    • Reason (R): Most carbohydrate binding proteins are lections.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are 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