Competitive Exams: Botany MCQs (Practice-Test 88 of 104)

  1. A minimum number of meiotic divisions required to produce 50 seeds of an angiosperm is

    1. 13

    2. 26

    3. 50

    4. 63

  2. Hydrophilic means pollination

    1. Below water

    2. Inside water

    3. On the surface of water

    4. By agents other than water

  3. During fertilization in Plum bago, sperms are delivered in

    1. The degenerating synergid

    2. Either of the synergids

    3. Egg

    4. Central cell

  4. Chemotropic growth of pollen tube in the pistil is in response of

    1. Potassium gradient

    2. Magnesium gradient

    3. Calcium gradient

    4. Phosphorus gradient

  5. Match List I (ocular structures) with List II (post-fertilization structures) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Ocule

    2. Funiculus

    3. Nucellus

    4. Polar nuclei

    1. Endosperm

    2. Aril

    3. Seed

    4. Per sperm

    • A
    • B
    • C
    • D
      • 2
      • 3
      • 4
      • 1
      • 2
      • 3
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
      • 3
      • 2
      • 1
      • 4
  6. In wheat, zygote undergoes

    1. Transverse division

    2. Longitudinal division

    3. Oblique division

    4. Percival division

  7. Which one of the following phytohormones is associated with seed maturation?

    1. ABA

    2. Kinetin

    3. Ethylene

    4. IAA

  8. The scutellum of the grass embryo is a

    1. Photosynthetic organ

    2. Reserve food storage organ

    3. Absorptive organ

    4. Vestigial organ

  9. Nuclear embryos found in citrus sp. Are

    1. Parthenogenesis

    2. Aposporous

    3. Apogamous

    4. Adventives

  10. What would be the number of chromosomes in the aleuronic cells of a plant with 42 chromosomes in the root tip cells?

    1. 21

    2. 42

    3. 63

    4. 84

  11. Post-zygotic sexual incompatibility can be overcome by

    1. Protoplast fusion

    2. Ovule culture

    3. In vitro pollination

    4. Bud pollination

  12. Which one of the following does NOT apply to saprophytic self-incompatibility systems?

    1. 3-celled pollen

    2. Dry stigma

    3. Rejection reaction in the style

    4. In vitro pollen germination is difficult

  13. What is the nature of statolith, which is associated with gravitropism in plants?

    1. Starch

    2. Amyloplast

    3. Lipid

    4. Protein

  14. Movement of hairs in Drosera is

    1. Seismoriastic

    2. The monastic

    3. Photometric

    4. Thigmonastic

  15. In dioeciously species, genetically female plants can be induced to produce male flowers by the application of

    1. IAA

    2. ethylene

    3. GA3

    4. ABA