Competitive Exams: Botany MCQs (Practice-Test 102 of 104)

  1. Successful cultivation of soybean in many states in India has been hampered by the absence of

    1. Azotobacter in the soil

    2. Rhizobiurm in the soil

    3. Anabaena in the soil

    4. Bradyrhizobium in the soil

    • Assertion (A): Viruses should not be used a vectors for gene transfer.
    • Reason (R): The viruses being pathogenic do not integrate with the host chromosome.
    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): Streptomycin plasmids have potentiality as DNA cloning vectors.
    • Reason (R): Plasmid DNA is taken up by strep tomyces protoplast treated with PEG.
    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): Cereals form the staple food of people all over the world.
    • Reason (R): Cereals do not require large storage space.
    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): Mitosis is a nuclear division by which two genetically identical daughter nuclei, are formed.
    • Reason (R): During metaphase of mitosis the chromosomes become duplicated; during the anaphase they separate to the opposite poles: During telo phase they form two daughter nuclei having the same number of chromosomes.
    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): Virtually all the chemical reactions that produce energy for breaking down carbohydrates or lipid mol ecules in the cell take place in mitochondria.
    • Reason (R): Mitochondria contain all the enzymes and co-entities necessary for this put pose.
    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): In most of the higher organisms, the formation of one chiasm reduces the probability of another chiasm forming in an immediae1y adjacent legion of the chromosome.
    • Reason (R): Once the parts of the chromatics are exchanged, they cannot rejoin the original strand at any other position.
    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 of the phosphorus present in the developing seeds is in the form of phytin.
    • Reason (R): Phosphorus is a mineral element.
    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): In coffee seeds per sperm serves as the storage tissue.
    • Reason (R): Endosperm is almost absent in coffee seeds.
    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 folding or rolling f leaves of hydromantic plants are controlled by bull form cells.
    • Reason (R): The loss of water through transpiration by bull form cells is slower than that by other epidermal 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): In flowering plants sexual incompatibility is either saprophytic or game tophytic.
    • Reason (R): Sexual incompatibility in angiosperms in controlled by efficient proteins.
    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): In photosynthesis, sugarbeet is more efficient than sugar-cane.
    • Reason (R): CO2 compensation point of sugarcane is much lower than that of sugar-beet.
    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): Calcium deficiency symptoms first appear in the apical region.
    • Reason (R): Calcium is highly mobile in plants.
    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

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

    List-I List-II
    1. Phenotype analysis

    2. Spermatogenesis

    3. Law of segregation (Mendel)

    4. Chromosome mapping

    1. Meiotic process

    2. Fertilization process

    3. Recessive type appearing in F2

    4. Visible expression of the genotype

    5. Indexing gene loci

    • A
    • B
    • C
    • D
      • 4
      • 2
      • 3
      • 1
      • 4
      • 1
      • 3
      • 5
      • 3
      • 2
      • 4
      • 5
      • 3
      • 2
      • 4
      • 1
  3. The basic molecules which together form the basis if life include

    1. Proteins and nucleic acids

    2. Amino acids and sugars

    3. Proteins Carbohydrates and nucleic acids

    4. Proteins, nucleic acids and secondary metabolites