Competitive Exams: Botany MCQs (Practice-Test 66 of 104)

  1. Which one of the following is endogenously produced?

    1. Ascospores

    2. Basidiospores

    3. Conidiospores

    4. Teleutospores

  2. Resin canals in Pinus are formed

    1. By the separation of secretory cells

    2. By the destruction of secretory cells

    3. Partly by separation and partly by destruction of secretary cells

    4. By large intercellular spaces of the cortex of the stem

  3. In which one of the following bryophytes does archesporium arise from endothelium?

    1. Marchantia

    2. Funaria

    3. Sphagnum

    4. Anthoceros

    • Assertion (A): Life cycle of Chlamydomonas is haplobiontic.
    • Reason (R): In the life cycle of Chlamydomonas haploid phase predominates over the diploid phase.
    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): Virus is an obligate parasite.
    • Reason (R): Virus can multiply only inside living cells.
    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): Stelar type present in Asteroxylon is actinostele.
    • Reason (R): When central xylem core is star-shaped, it is called actinostele.
    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): Tagging of genes is more reliable when the genetic distance between the marker and the target gene is small.
    • Reason (R): The probability of a crossover event separating a marker from the locus governing the trait diminishes with the decreasing distance.
    • Assertion (A): Photosynthetic bacteria do not evolve Oxygen during photosynthesis.
    • Reason (R): Photosynthetic bacteria are obligate o facultative anaerobes.
    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): Protein synthesis is a slow process requiring about a day to form one polypeptide from amino acid.
    • Reason (R): Protein synthesis requires the involvement of several components such as messenger RNA, transfer RNA amino acids, catalytic proteins, cofactors and ribosome's.
    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): Carbon-14 is used in photosynthetic studie.
    • Reason (R): Carbon-14 has a short half life.
    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 endogenous level of plant hormones is measured by bioassay technique.
    • Reason (R): The concentration of hormones in plants is so low that it is not possible to chemically estimate the level
    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): Many dormant seeds can be made to germinate by increasing the partial pressure of oxygen.
    • Reason (R): Under ambient atmospheric conditions the testa of gashard seeds is only sparingly permeable to oxygen
    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 saprophytic type of self incompatibility is frequently characterized by reciprocal differences in the compatibility reaction.
    • Reason (R): Saprophytic incompatibility reaction is imparted to the pollen by the plant upon which the pollen is borne
    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): Claviceps purpurea produces alkaloids of pharmaceutical value when grown naturally but not in artificial media.
    • Reason (R): In artificial media, the photoperiod is limiting.
    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

  4. Morph species is

    1. A phylogenetically-linked biotype

    2. Morphological features of a species adapted to specific ecological niche

    3. A floristic unit on which identification of a species may depend

    4. A fossil species classified on the basis of morphological features