Competitive Exams: Botany MCQs (Practice-Test 77 of 104)

  1. The formation of gibberellins is necessary during the germination of barley seeds for the synthesis and secretion of hydrolase's. The gibberellins is formed in the

    1. Endosperm

    2. Aleuronic layer

    3. Embryo

    4. Scutellum

  2. Kinetin was first isolated from

    1. Immature corn seeds

    2. DNA of coconut milk

    3. DNA of herring sperm

    4. DNA of monkey's liver

  3. The induction of cell elongation by IAA is explained on the basis of

    1. The acid growth hypothesis

    2. Auxin-ethylene balance hypothesis

    3. Sodium-potassium pump hypothesis

    4. Osmotic pressure hypothesis

  4. Match List I (Plant hormone) with List II (Typica physiological effect) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Auxin

    2. Gibberellins

    3. Cytokine

    4. Ethylene

    1. Apical dominance

    2. Cell division

    3. Fruit ripening

    4. Internodes elongation

    • A
    • B
    • C
    • D
      • 1
      • 4
      • 2
      • 3
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
      • 2
      • 3
      • 4
      • 1
      • 3
      • 2
  5. Rapid and irreversible cell elongation occurs commonly in plants but not in animals. This difference is due to the

    1. Presence of chloroplasts and mitochondria

    2. Absence of centrioles and glogi bodies

    3. Absence of endoplasmic reticulum and presence of large vacuoles

    4. Presence of large vacuoles and cell walls.

  6. Glycol ate is converted into glyoxylate in the

    1. Glyoxomes

    2. Microtubules

    3. Peroximoses

    4. Golgi bodies

  7. The mitotic cycle is initiated by the activation of

    1. tubulin protein

    2. kinetochore protein

    3. MPF-protein kinase

    4. RNA polymerase

  8. If two loci are 10 map units apart, assuming that no multiple cross-over has taken place, what proportion of the cells undergoing meiosis will contain a single cross-over in the region between these two loci?

    1. 10%

    2. 20%

    3. 30%

    4. 40%

  9. In pseudo-allelism, genes

    1. Are functionally allelic and structurally non-allelic

    2. Are structurally as well as functionally non-allelic

    3. Are structurally allelic and functionally non-allelic

    4. Are structurally as well as functionally non-allelic

  10. When a growing structurally unsynchronized culture of a strain of E. Coli is exposed to a three-minute pulse of [3H]-thymidine, a great majority of individual bacteria become radioactive. This indicates that

    1. DNA synthesis occupies only a fraction of the time required for cell division

    2. Transcription of DNA to form m-RNA is continuously taking place

    3. Bacterial DNA replication is taking place in a semi conservative manner

    4. DNA synthesis is taking place for almost the entire duration of the division cycle

  11. The garden pea (Pisum sativum) has 14 chromosomes in each of its body cells. The numbers of linkage groups expected in teh species is

    1. less than 7

    2. 7

    3. between 7 and 14

    4. 14

  12. RNA polymerase-II binds to promoters during assembly of a transcription complex which contains

    1. Once transcription factor

    2. Several transcription factors some of which contain Fe-fingers

    3. Several transcription factors some of which contain Zn-fingers

    4. Nucleases

  13. Consider the following statements regarding linkage of genes:

    1. Two genes are said to be linked when they fail to show independent assortment.

    2. The strength of the linkage is determined by the distance between the two genes in question.

    3. The strength of the linkage is directly proportional to the distance between the two genes.

    Of these statements

    1. 1, 2 and 3 are correct

    2. 1 and 2 are correct

    3. 2 and 3 are correct

    4. 1 and 3 are correct

  14. The activity of alpha-amylase in the endosperm of barley plants is induced by

    1. Ethylene

    2. Cytokine

    3. IAA

    4. Gibberellins

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

    List-I List-II
    1. Ascobolus

    2. Erysiphe

    3. Polyporous

    4. Tilletia

    1. Lignicolous

    2. Bunt disease

    3. Ectoparasite

    4. Coprophilous

    • A
    • B
    • C
    • D
      • 4
      • 3
      • 2
      • 1
      • 3
      • 4
      • 2
      • 1
      • 4
      • 3
      • 1
      • 2
      • 3
      • 4
      • 1
      • 2

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