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Sexual Reproduction in Flowering Plants Test - 4

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Sexual Reproduction in Flowering Plants Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which one of the following is not true about pollen?

    Solution

    Pollen can cause allergy or Hay-fever in some individuals but not Pneumonia because it is caused by Streptococcus pneumoniae.

  • Question 2
    1 / -0

    1. Protonemal cell of a moss
    2. Primary endosperm nucleus of a dicot
    3. Leaf cell of a moss
    4. Prothallus of a fern
    5. Gemma cell of Marchantia
    6. Meristem cell of monocot
    7. Ovum of a liverwort
    8. Endosperm of gymnosperm.

    Identify their ploidy in the following order - Haploid, diploid, triploid.

    Solution

    Haploid-6: protonemal cell of moss (gametophyte), Leaf cell of moss( gametophyte), Prothallus of fern (gametophyte), Gemma (asexual cup), Ovum of liverwort and Endosperm of gymnosperm.
    Diploid-1 ( meristem of monocot sporophyte)
    Triploid-1 ( PEN of dicot)

  • Question 3
    1 / -0

    Siphonogamy is a strategy of sexual reproduction adopted by one of the following plant divisions. Which one is it?

    Solution

    Siphonogamy refers to the formation of pollen tube for the transfer of male gamete to the egg chamber in seed plants while in lower plants male is flagellated and swims to reach the egg in the water medium.

  • Question 4
    1 / -0

    In calotropis, a hood like mechanical barrier exists between compatible pollen and stigma to prevent self-pollination. This strategy is termed as:

    Solution

    Herkogamy is a common strategy employed by hermaphroditic angiosperms to reduce sexual interference between male (anthers) and female (stigma) function. Herkogamy differs from other such strategies (e.g. dichogamy) by supplying a spatial separation of the anthers and stigma.

  • Question 5
    1 / -0

    Match the colour of the flower in column A with the pollinating agent in Column B:

    Column - A Column - B
    1. Yellow flowers with fragrance and nectar A. Bat
    2. White flowers with fragrance and nectar B. Bird
    3. Odourless, red tubular flowers with dilute nectar C. Moth
    4. White or light coloured flowers with strong odour and nectar D. Bees
    Solution

    Yellow flowers with fragrance and nectar are pollinated by bees. 2. White flowers with fragrance and nectar are pollinated by moth. 3. Red tubular flowers with odourless dilute nectar are pollinated by birds. 4. White or light coloured flowers with strong odour and nectar are pollinated by bats.

  • Question 6
    1 / -0

    Which of the following micronutrients is vital for pollen germination?

    Solution

    Boron is vital for pollen tube formation. In laboratory, borax and tender coconut are used as sources of boron for pollen germination.

  • Question 7
    1 / -0

    If you go outside and see a banyan tree and photosynthesizing funaria, you would be looking at:

    Solution

    Banyan is an angiosperm and the tree that we look at is a diploid sporophyte. Funaria is a bryophyte and the photosynthetic part is only haploid gametophyte.

  • Question 8
    1 / -0

    Double fertilisation involves

    Solution

    Single pollen tube reaches embryo sac. Two nuclei reach the micropyle, one undergoes mitosis while the other degenerates. One of them fertilises the egg leading to embryo formation while the other fertilises the polar nuclei to form endosperm which is called PEN - Primary Endosperm Nucleus(triploid).

  • Question 9
    1 / -0

    Largest cell of embryo sac is

    Solution

    The central cell is the largest. It has two nuclei as it does not undergo cytokinesis. It develops into the endosperm after double fertilisation.

  • Question 10
    1 / -0

    Ophioglossum (adders or snake tongue fern) has the maximum 1260 chromosomes. Then, its spore and protonema would have ______ and _____ chromosomes respectively.

    Solution

    Spore and protonema are apparently haploids in a fern.Thus, they will have half the number of chromosomes than the diploid cell which will be 630.

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