Sexual Reproduction in Flowering Plants
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Questions and Answers

What is a characteristic of the egg cell in Type 1 apomixis?

  • It is triploid (3n)
  • It is tetraploid (4n)
  • It is haploid (n)
  • It is diploid (2n) (correct)

    • In Type 2 apomixis, what is the origin of the nucellar cells that penetrate into the embryo sac?

  • They are derived from the pollen tube
  • They are derived from the female gametophyte
  • They are derived from the egg cell
  • They are derived from the nucellus cells (correct)

    • What is the term for the occurrence of more than one embryo in a seed?

  • Polyembryony (correct)
  • Apomixis
  • Hybridization
  • Fertilization

    • What is the advantage of producing hybrid seeds through apomixis?

    <p>It maintains the hybrid nature of the seeds</p> Signup and view all the answers

    What is the role of the nucellus cells in Type 2 apomixis?

    <p>They penetrate into the embryo sac and start dividing</p> Signup and view all the answers

    What is the result of multiple egg cells giving rise to the zygotic embryo in Type 1 apomixis?

    <p>The formation of a single zygotic embryo</p> Signup and view all the answers

    What happens to the generative cell in a 2-celled pollen during pollen-pistil interaction?

    <p>It divides to form two male gametes</p> Signup and view all the answers

    Where do the male gametes enter during fertilization?

    <p>Through the micropylar end of the embryo sac</p> Signup and view all the answers

    What is the process called when one male gamete fuses with the egg nucleus to form the zygote?

    <p>Syngamy</p> Signup and view all the answers

    What stops growing during fertilization?

    <p>The pollen tube</p> Signup and view all the answers

    What is the process of formation of zygote by the fusion of male and female gametes?

    <p>Fertilisation</p> Signup and view all the answers

    What is the other term for the fusion of one male gamete with the egg nucleus to form the zygote?

    <p>Syngamy</p> Signup and view all the answers

    What is the result of triple fusion during double fertilization?

    <p>Formation of a primary endosperm nucleus</p> Signup and view all the answers

    What type of endosperm development is characterized by the primary endosperm nucleus dividing repeatedly without cytokinesis?

    <p>Nuclear type</p> Signup and view all the answers

    Through which part of the ovule does the pollen tube enter during fertilization?

    <p>Micropyle</p> Signup and view all the answers

    What is the main source of nutrition for the embryo in the seed?

    <p>Endosperm</p> Signup and view all the answers

    What type of fertilization occurs when the pollen tube enters the ovule through the integuments?

    <p>Chalazogamy</p> Signup and view all the answers

    What is the term for the process of development of the embryo from the zygote?

    <p>Embryo development</p> Signup and view all the answers

    What is the position of the scutellum in the monocot embryo?

    <p>Towards one side of the embryonal axis</p> Signup and view all the answers

    Which part of the seed coat protects the developing embryo?

    <p>Integuments</p> Signup and view all the answers

    What is the function of the coleorhiza in the monocot embryo?

    <p>It encloses the radical and root cap</p> Signup and view all the answers

    What is the term for the hollow foliar structure that encloses the shoot apex and leaf primordia in the monocot embryo?

    <p>Coleoptile</p> Signup and view all the answers

    What is the part of the seed that is used by the embryo to grow?

    <p>Food reserves</p> Signup and view all the answers

    What is the opening through which the pollen tube enters the ovule during fertilization?

    <p>Micropyle</p> Signup and view all the answers

    What is the fate of the majority of the megaspores formed during megasporogenesis?

    <p>They degenerate, leaving only one functional megaspore</p> Signup and view all the answers

    What is the primary function of the integuments in the ovule?

    <p>To protect the ovule from external damage</p> Signup and view all the answers

    In which part of the ovule is the megaspore mother cell typically located?

    <p>Micropylar end</p> Signup and view all the answers

    What is the term for the small opening in the ovule through which the pollen tube penetrates?

    <p>Micropyle</p> Signup and view all the answers

    What is the structure that contains the female gametophyte and is located inside the nucellus?

    <p>Embryo sac</p> Signup and view all the answers

    What is the process by which a megaspore is formed from a megaspore mother cell?

    <p>Megasporogenesis</p> Signup and view all the answers

    What is the function of the endothecium in the microsporangium?

    <p>Protection and assistance in dehiscence</p> Signup and view all the answers

    What is the number of sporangia present in each microsporangium?

    <p>4</p> Signup and view all the answers

    What is the location of the microsporangia in the anther?

    <p>At the corner of the anther</p> Signup and view all the answers

    What is the role of the tapetum in the microsporangium?

    <p>Nutrition to the developing pollen grains</p> Signup and view all the answers

    What is the process that occurs inside the sporogenous tissue at the center of each microsporangium?

    <p>Microsporogenesis</p> Signup and view all the answers

    What is the tissue that undergoes meiosis to produce gametes in the microsporangium?

    <p>Sporogenous tissue</p> Signup and view all the answers

    What is the function of the integuments in the ovule?

    <p>To protect the ovule</p> Signup and view all the answers

    Where is the embryo sac located in the ovule?

    <p>Inside the nucellus</p> Signup and view all the answers

    What is the result of meiosis II in megasporogenesis?

    <p>Formation of a megaspore tetrad</p> Signup and view all the answers

    What is the small opening in the ovule through which the pollen tube penetrates?

    <p>Micropyle</p> Signup and view all the answers

    What is the region of the ovule near the micropyle?

    <p>Micropylar end</p> Signup and view all the answers

    How many megaspores are typically functional at the end of megasporogenesis?

    <p>One</p> Signup and view all the answers

    Where is the megaspore mother cell typically located?

    <p>In the nucellus</p> Signup and view all the answers

    What is the function of the integuments in the ovule?

    <p>To protect the developing embryo</p> Signup and view all the answers

    What is the small opening in the ovule through which the pollen tube penetrates?

    <p>Micropyle</p> Signup and view all the answers

    What is the structure that contains the female gametophyte and is located inside the nucellus?

    <p>Embryo sac</p> Signup and view all the answers

    What is the term for the process of development of the embryo from the zygote?

    <p>Embryogenesis</p> Signup and view all the answers

    What is the function of the coleorhiza in the monocot embryo?

    <p>To protect the radical and root cap</p> Signup and view all the answers

    What is the outermost layer of the microsporangium wall?

    <p>Epidermis</p> Signup and view all the answers

    What is the function of the endothecium in the microsporangium?

    <p>Aiding in dehiscence of anther</p> Signup and view all the answers

    What is the innermost layer of the microsporangium wall?

    <p>Tapetum</p> Signup and view all the answers

    How many sporangia are present in each microsporangium?

    <p>4</p> Signup and view all the answers

    Which tissue undergoes meiosis to produce gametes in the microsporangium?

    <p>Sporogeneous tissue</p> Signup and view all the answers

    Where does Microsporogenesis occur?

    <p>In the sporogenous tissue</p> Signup and view all the answers

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