Competitive Exams: Botany MCQs (Practice-Test 36 of 104)

  1. Consider the following statements: Segmental allopolyploids are the polyploids in which

    1. The chromosomes are derived from different genomes.

    2. The chromosomes form multivalent during meiosis.

    3. The genome involved are not quite different from one another

    Which of the statements given above are correct?

    1. 1 and 2 only

    2. 2 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

  2. Double trisomes have a genomic constitution of

    1. 2n + 2

    2. 2n + 1 + 1

    3. 2n + 1

    4. 2n − 1

  3. The plasmid derived from E. Coli plasmid Col EI is:

    1. YIP

    2. pYAC

    3. pBR-322

    4. Ti-plasmid

  4. Which one of the following is also known as southern hybridization?

    1. DNA-RNA hybridization

    2. RNA-RNA hybridization

    3. DNA-DNA hybridization

    4. Protein-Protein hybridization

  5. With reference to the designing of vectors based on Ti and Ri plasmids, consider the following statements:

    1. they are disarmed by removing the genes causing the disease

    2. They carry sites for insertion of gene of interest.

    3. They carry selectable markers.

    Which of the statements given above are correct?

    1. 1 and 2 only

    2. 2 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

  6. Match List I (Transgenic variety of crop) with List II (Trait for which gene has been incorporated) and select the correct answer using the given below the lists:

    List-I List-II
    1. Seed link maixe

    2. Rainbow papaya

    3. Flavr Savr tomato

    1. Virus resistance

    2. Herbicide resistance

    3. Altered ripening

    4. Insect resistance

    • A
    • B
    • C
      • 2
      • 1
      • 3
      • 2
      • 3
      • 1
      • 4
      • 3
      • 1
      • 4
      • 1
      • 3
  7. Peptide bond is formed between

    1. Two amino groups

    2. Carboxyl group and ketone group

    3. Amino group and carboxyl group

    4. Two carboxyl groups

  8. With reference to sex determination in Melandrium album, consider the following statements:

    1. The Y chromosome is longer than the X chromosome.

    2. The Y chromosome and X chromosome form a heteromorphic bivalent at meiosis.

    3. It is the presence of a single Y chromosome rather than any number of

    X chromosomes or autosomes that give a male individual.

    Which of the statements given above are correct?

    1. 1 and 2 only

    2. 2 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

  9. Which one of the following is the main cause of the lower yield of F2 generation than the F1 generation following hybridization between two inbred lines of maize?

    1. Heterosis

    2. Luxuriance

    3. Inbreeding depression

    4. Heterobeltiosis

  10. Which one of the following is the correct sequence of the appearance of intermediate compounds in the pathway of photorespiration?

    1. Glyoxylate-glycine-glycolate-serine

    2. Glyoxylate-serine-glycolate-glycine

    3. Glycolate-glyoxylate-glycine-serine

    4. Glycolate-glyoxylate-serine-glycine

  11. The Coupling and Repulsion hypothesis was put forth by:

    1. W. Bateson

    2. T H Morgan

    3. L. W. Shap

    4. John Belling

  12. Hybrid vigour in artificial tobacco hybrids was first reported by:

    1. G. H. Shull

    2. J. Kolereuter

    3. C B Davenport

    4. A. Collins

  13. In the early atmosphere of earth, before the origin of life, which one of the following was not present?

    1. Ammonia

    2. Free hydrogen

    3. Methane

    4. Free oxygen

  14. Which one of the following types of inflorescence is found in carrot?

    1. Catkin

    2. Corymb

    3. Spike

    4. Umbel

  15. Which of the following factors are involved in the formation of new species?

    1. Isolation and mutation

    2. Competition and variation

    3. Isolation and competition

    4. Competition and mutation