Competitive Exams: Botany MCQs (Practice-Test 9 of 104)

  1. In lettuce, red light is most effective in breaking seed dormancy because it

    1. Stimulates water absorption

    2. Reverses inhibitory effect of far-red light

    3. Enhances respiratory rate

    4. Breaks down ABA

  2. How many meiotic divisions are required to produce 12 pollen grains in Cyperaceous?

    1. 3

    2. 4

    3. 6

    4. 12

  3. Which one of the following plants is being used as a model system to study developmental genetics of zygotic embryo genesis?

    1. Arabidopsis thaliana

    2. Daucus carota

    3. Zea mays

    4. Capsella bursa-pastoris

  4. Which one of the following pairs is NOT correctly matched?

      • Neem
      • Azadirachtin
      • PEG
      • Protoplast fusion
      • Gybogenesis
      • Haploids
      • Wheat
      • 2-celled pollen
  5. In angiosperms, which one of the following processes does NOT involve an unequal division?

    1. Formation of microspores

    2. Formation of generative cell

    3. Zygotic embryogenesis

    4. Helobial endosperm development

  6. The male germ unit (MGU) in angiosperms comprises of

    1. Vegetative nucleus and the generative cell

    2. The two sperm cells

    3. Vegetative nucleus and one of the sperms

    4. Vegetative nucleus arid the two sperms

  7. Match list I with list II and select the correct answer:

    List-I List-II
    1. Pollinia

    2. Aril

    3. Virus elimination

    4. Tip growth

    1. Litchi

    2. Pollen tube

    3. Orchids

    4. Meristem culture

    5. Paleontology

    • A
    • B
    • C
    • D
      • 3
      • 2
      • 4
      • 5
      • 2
      • 1
      • 3
      • 4
      • 4
      • 3
      • 5
      • 2
      • 3
      • 1
      • 4
      • 2
  8. Cleistogamy is found in

    1. Ficus

    2. Commelina

    3. Vallisnerea

    4. Anthocephalus

  9. When the pollen of one flower pollinates another flower on the same plant, it is called

    1. Autogamy

    2. Geitonogamy

    3. Allogamy

    4. Xenogamy

  10. Which one of the following technique has been widely used to overcome sexual incompatibility?

    1. In vitro fertilization

    2. Geitonogamy

    3. Allogamy

    4. Xenogamy

  11. The pollen tube discharges its contents in

    1. The egg

    2. One of the synergids

    3. The central cell

    4. One of the antipodal cells

  12. Pollen tube growth is an example of

    1. Geotropism

    2. Chemotropism

    3. Thigrnotropism

    4. Heliotropism

  13. Formation of callose wall occurs during

    1. Embryogenesis

    2. Endosperm development

    3. Megasporogenesis

    4. Seed germination

  14. Embryo maturation is favoured by:

    1. IAA

    2. 2, 4 − D

    3. BAP

    4. ABA

  15. The envelope of the embryonic shoot in maize seed is called

    1. Testa

    2. Tegrnen

    3. Scutellum

    4. Coleoptile