fertilisation

• when does fertilisation occur in plants

  when a compatible pollen grain lands on a stigma
• what is secreted in the stigma

  a sugary solution
• what happens when the pollen grain lands on a compatible stigma

  the pollen grain will then germinate and the pollen tube nucleus will produce a pollen tube
• where is the pollen tube nucleus located

  it is at the tip of the pollen tube
• what is also found at the tip of the pollen tube

  two male nuclei
• what is the function of the pollen tube nucleus

  it codes for hydrolytic enzymes
• what are hydrolytic enzymes used for

  they digest though the tissues of the style of a plant
• what are the products of the hydrolytic enzymes digesting the tissues used by

  they are used by the pollen tube
• what happens to the pollen tube in fertilisation

  it enters the embryo sac
• how does the pollen tube enter the embryo sac

  through the micropyle
• what happens to the pollen tube nucleus after it enters the embryo sac

  the pollen tube nucleus will disintegrate and the tip of the pollen tube will open
• what is released when the pollen tube is disintegrated in the embryo sac

  two male nuclei
• how may haploid nuclei are found in the embryo sac

  8
• how many of the 8 haploid nuclei in the embryo sac are polar nuclei

  2
• how many of the 8 haploid nuclei in the embryo sac are the female gamete


  1