The Stigma in a Flower: Plant Reproduction
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Questions and Answers

What is the primary function of the stigma in a flower?

  • To attract insects for pollination
  • To provide support to the petals
  • To produce pollen
  • To receive pollen for fertilization (correct)

    • What is the term for the female reproductive system in a flower?

  • Carpel
  • Pistil
  • Gynoecium (correct)
  • Androecium

    • What is the sticky bulb at the top of the style called?

  • Stigma (correct)
  • Pistil
  • Stamen
  • Ovary

    • What is the individual female reproductive organ composed of?

    <p>Ovary, style, and stigma</p> Signup and view all the answers

    What is the term for the group of pistils in a flower?

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

    Where is the stigma typically located in a flower?

    <p>On top of the style</p> Signup and view all the answers

    What is the purpose of the style in a flower?

    <p>To connect the stigma to the ovary</p> Signup and view all the answers

    What is the primary function of the filaments in a plant?

    <p>To hold up the anthers</p> Signup and view all the answers

    What is the purpose of pollen discrimination in flowers?

    <p>To recognize and reject incompatible pollen</p> Signup and view all the answers

    Why do some plants have a longer style?

    <p>To allow for more room to move in the breeze</p> Signup and view all the answers

    What is the function of the stigmatic papillae?

    <p>To receive pollen</p> Signup and view all the answers

    What is the result of successful fertilization in a plant?

    <p>The formation of seeds</p> Signup and view all the answers

    Why is the stigma of a flower sticky?

    <p>To capture pollen from the wind or insects</p> Signup and view all the answers

    What is the purpose of the waxy or sticky surface of the stigma?

    <p>To capture and facilitate the movement of pollen</p> Signup and view all the answers

    What is the function of the style in a plant?

    <p>To move pollen down into the pistil and ovaries</p> Signup and view all the answers

    Study Notes

    Structure of a Flower

    • Flowers have either a female reproductive system, a male reproductive system, or both.
    • The female and male parts can be on the same plant or on different plants.
    • The stigma is part of the female reproductive system, located in the center of a flower.

    Stigma

    • A stigma is a sticky bulb on top of the style, a thin stalk or stem.
    • Stigmas can be large or small, and vary in shape, size, and color.
    • The stigma is covered with stigmatic papillae, cells that receive pollen.

    Functions of Stigma

    • The stigma catches pollen transferred by wind or insects, such as bees and butterflies.
    • The pollen is pulled down through the style and into the pistil, where fertilization occurs.
    • The stigma helps to move pollen through the process by rehydrating dry pollen.
    • Fertilization occurs in the ovaries, leading to the formation of seeds.

    Adaptations of Stigma

    • Over time, the stigma has become stickier to increase pollen capture.
    • The style has become stronger to hold the stigma in place.
    • Some plants have longer styles to allow the stigma to move in the wind.
    • Stigmas come in different shapes and sizes, depending on pollinators and environment.

    Stickiness of Stigma

    • The stigma is sticky to help hold onto pollen from wind or insects.
    • The stickiness also helps to move pollen down through the style.
    • The moisture on the stigma rehydrates dry pollen, facilitating fertilization.

    Variations of Stigma

    • Sessile stigmas are on flowers with extremely short styles or no style at all.
    • Some stigmas have three lobes that transfer pollen to facilitate fertilization.
    • Stigmas can be tall and feathery, with a large surface area for catching wind-blown pollen.

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    Description

    Learn about the different reproductive systems in flowers, including those with male and female parts, and the role of the stigma in plant fertilization.

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