Competitive Exams: Botany MCQs (Practice_Test 10 of 104)

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  1. Which one of the following does NOT exhibit seed dormancy?
    1. Rhizophoi
    2. Xanthium
    3. Phaseolus
    4. Cassia
  2. Aleurone is the outermost layer of endosperm in cereals. It helps in
    1. Protection of endospermic
    2. Endosperm growth
    3. Accumulation of reserve food in the endosperm
    4. Mobilization of reserve food in the endosperm
  3. The pollen-pistil rejection reaction in a plant showing ametophytic selfincompatibility usually occurs
    1. On the stigma
    2. In the style
    3. In the ovary before entering the embryo sac
    4. During game tic fusion
  4. The pertinacious substance involved in saprophytic incompatibility and stored in the exile is derived from
    1. Tapetum
    2. Microspore
    3. Anther locule
    4. Stigmatic papillae
  5. The fluid mosaic model of cell membrane postulates that a lipid bilayer
    1. Has some embedded protein and some proteins on the surface
    2. Coated with a layer of proteins on each surface
    3. Is coated with a layer of proteins on the outer surface only
    4. Has proteins embedded in itself and none on the surface
  6. The function of Lysosome is to
    1. Synthesize various cellular macromolecules
    2. Carry out digestion of all cytoplasm components
    3. Ingest material from the extravehicular environment
    4. Recycle cellular material and digest material taken in from the environment
  7. Consider the following statements:
    1. In plant cells, cytokines is starts with the formation of the phragmoplast.
    2. Phragmoplast comprises interozonal microtubules and Golgi vesicles.
    3. Primary cell wall is produced by microtubules.

    Which of the above statements are correct?

    1. l and 3
    2. l and 2
    3. 2 and 3
    4. 1,2 and 3
  8. Which one of the following discoveries provided the strongest evidence for the chromosome theory of heredity?
    1. Discovery of sex chromosomes
    2. Discovery of polyploidy
    3. Discovery of giant chromosomes
    4. Discovery of supernumerary chromosomes
  9. What is the correct sequence of stages in Prophase I of meiosis?
    1. Leptotene, Pachytene, Zygotene, Diakinesis, Diplotene
    2. Zygotene, Leptotene, Paehytene, Diplotene, Diakinesis
    3. Leptotene, Zygotene, Pachytene, Diplotene. Diakinesis
    4. Zygotene. Pachytene. Leptotene

    Diakinesis, Diplotene

  10. A yellow and round seeded pea plant is crossed with green and wrinkled seeded pea plant and the F1 of this cross is backcrossed to the homozygous recessive parent. The progeny will appear in the ratio of
    1. 9: 3: 3: 1
    2. 1: 1: 1: 1
    3. 9: 3: 4
    4. 12: 3: 1
  11. Genetically engineered male sterile crop plants have been produced by inserting
    1. Opaque 2 gene
    2. Virus coat-protein gene
    3. Bamase gene
    4. Chitinase gene
  12. Haploids are considered better genetic stock because they
    1. Require only half of the nutrients
    2. Are best for cytological studies
    3. Grow better under all conditions
    4. Form homozygous individuals on depolarization
  13. Ti plasmid used in genetic engineering is obtained from
    1. Bacillus thuzingiensis
    2. Agrobacterium rhizogenes
    3. Agrobacterium tumefaciens
    4. Pseudomonas syringae
  14. Consider the following steps during recombinant DNA technology:
    1. Breaking of donor DNA using restriction enzyme
    2. Culture of cloned bacteria containing the fragment of donor DNA
    3. Isolation of suitable plasmid
    4. insertion of recombinant DNA through cloning
    5. Joining of donor DNA with a suitable plasmid using ligase

    The correct sequence of these is

    1. 1, 3,2, 4,5
    2. 3.2,1, 5,4
    3. 1,3, 5.4,2
    4. 5, 1,3, 4,2
  15. Terminator seeds produced by giant seed companies using techniques of genetic engineering are in fact
    1. Hybrid seeds which germinate in the frame՚s field but do not produce seeds in the next generation
    2. Hybrid seeds which give a very high yield
    3. Seed which germinate and produce incompatible gametes
    4. Seeds that develop into fertile plants which produce flog-terminable seeds

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