Competitive Exams: Botany MCQs (Practice-Test 22 of 104)

  1. Which one of the following statements is not correct?

    1. The greenhouse gases trap only the heal in infra-red radiation

    2. Natural gas supplies five percent f global energy needs

    3. One molecule of CFC can trap as many as 10, 000 molecules of CO2

    4. The atmospheric life time of CFCl3 is estimated at 75 years

  2. In a bacterium, the amount of Adenine was found to be 18 percent. Suggest the cytosine base composition from the following:

    1. 64%

    2. 36%

    3. 32%

    4. 18%

  3. Which one of the following is an example of an enzyme group called transferees?

  4. Which one of the following is an example of an enzyme group called transferees?

    1. Acetyl Co A synthetase

    2. a-amylase, k

    3. Fructose biphosphate aldolase

    4. 3-phosphoglycerate kinase

  5. In view of the suicides committed by the poor farmers towards raising the commercial F1 hybrid seeds, a plant breeder wishes to supply them the hybrid seeds at a chapter cost. Which One of the following type of genetic stocks can be choose?

    1. Inbred lines

    2. Back-cross progeny

    3. Male sterile lines

    4. Pedigree lines

  6. The gene promoter sequences, commonly used in gene cloning experiments are derived from

    1. TMV (Tobacco Mosaic Virus)

    2. TSWV (Tomato Spotted Wilt Virus)

    3. CMV (Cucumber Mosaic Virus)

    4. CaMV (Cauliflower Mosaic Virus)

  7. Which one of the following is a hydrophyte?

    1. Atistida

    2. Certophyllum

    3. Carthamus

    4. Pedilanthus

  8. A genetic engineer wishes to construct a shuffle vector for his experiments. What essential requirements should it possess to integrate with the host systems?

    1. Different origins of replication of DNA

    2. Cos sites for incorporation of DNA

    3. Polylinker sites for insertion of foreign DNA

    4. Restriction enzyme sites to generate cohesive ends of DNA

  9. An Albugo caused disease in which pustules on the surface of leaves, stem, inflorescence and floral parts along with various types of deformities of which, hypertrophy is most pronounced, are the characteristic symptoms of

    1. Yellow stripe rust of wheat

    2. White rust of mustard

    3. Yellow ear rot and ear cockle of wheat

    4. Udbatta disease of rice

  10. The most effective technique to produce virus-free plants from infected individuals is

    1. Shoot tip culture

    2. Protoplast culture

    3. Single cell culture

    4. Nodal segment Culture

  11. Which of the following combinations of features is true for saprophytic selfincompatibility?

    1. 3-cell pollen, dry stigma and rejection reaction in the style

    2. 2-celled pollen, short pollen viability, rejection reaction on the stigma

    3. 2-celled pollen, wet stigma, rejection reaction in the style

    4. Short pollen viability, dry stigma, rejection reaction on the stigma

  12. In Melandrium album, absence of which segment of Y chromosome leads to development of a female plant?

    1. Suppressor region

    2. Promoter region

    3. Fertility region

    4. Pairing region

  13. Match List I with List II and select the correct answer:

    List-I (Nature of codons) List-II (Different codons)
    1. Initiation codon

    2. Termination codon

    3. Codon for proline

    4. Codon for lysine

    1. AAA

    2. UUU

    3. GGG

    4. UAA

    • A
    • B
    • C
    • D
      • 2
      • 4
      • 1
      • 1
      • 3
      • 4
      • 3
      • 2
      • 4
      • 3
      • 2
      • 1
      • 3
      • 2
      • 3
      • 1
  14. Phototropic response of coleoptiles is mediated through

    1. Anthocyanin

    2. Chlorophyll a

    3. Cryptochrorne

    4. Phytochrome

  15. Which one of the following phenomena leads to aneuploidy?

    1. Improper division of centromere

    2. Desynapsis

    3. Asynapsis

    4. Non-disjunction