Chap 2 Flowers Part 1 Flowers Classification n Pollination
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Questions and Answers

What is the role of the petals in most flowers?

  • To hold the flower to the shoot
  • To produce seeds
  • To attract insects for pollination (correct)
  • To protect the flower in bud stage

    • What structure attaches the flower to the shoot?

  • Pedicel (correct)
  • Thalamus
  • Sepal
  • Style

    • What is the swollen upper end of the pedicel called?

  • Thalamus (correct)
  • Filament
  • Style
  • Ovary

    • Which part of a flower develops from the floral bud and is responsible for sexual reproduction?

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

    Which floral part is involved in enclosing and protecting the inner whorls of a flower in bud stage?

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

    Which of the following is part of the pistil?

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

    What is another name for bisexual flowers?

    <p>Hermaphrodite flowers</p> Signup and view all the answers

    Which of the following is an example of an incomplete flower?

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

    What type of plant has male and female flowers on separate plants?

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

    Which of the following functions is NOT a primary function of flowers?

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

    Which plant is an example of a monoecious plant?

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

    What is the largest flower found in nature?

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

    Which whorl is missing in an incomplete flower?

    <p>Any of the above</p> Signup and view all the answers

    What is the very first step in studying the structure of an ovary?

    <p>Remove sepals, petals, and stamens.</p> Signup and view all the answers

    When observing an ovary cut widthwise, which of the following should be noted?

    <p>The number of chambers in the ovary.</p> Signup and view all the answers

    What is the term for a group or cluster of flowers on a twig?

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

    Which of the following actions is not part of the procedure to study different flowers and their parts?

    <p>Cut the flower lengthwise to study the ovary.</p> Signup and view all the answers

    How many ovules are found in each chamber of the Hibiscus flower's ovary?

    <p>2</p> Signup and view all the answers

    What tool is recommended to study the detailed structure of the ovary?

    <p>Hand lens</p> Signup and view all the answers

    Which part of the flower is NOT removed when preparing to study the ovary?

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

    In the context of the activities described, what is a whorl in a flower?

    <p>A circular arrangement of flower parts</p> Signup and view all the answers

    Which flower is mentioned specifically in Activity 3 as having five chambers in its ovary?

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

    Which of the following steps involves the actual transfer of pollen grains?

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

    What is pollination by wind referred to as?

    <p>Wind pollination</p> Signup and view all the answers

    Which plant is NOT typically pollinated by wind?

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

    Which term describes the transfer of pollen grains from the anther of one flower to the stigma of another flower on the same plant?

    <p>Self-pollination</p> Signup and view all the answers

    What is the primary role of pollinators in the pollination process?

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

    Cross-pollination involves which of the following?

    <p>Flowers of different plants of the same type</p> Signup and view all the answers

    Which characteristic is NOT associated with wind-pollinated flowers?

    <p>Fragrant flowers</p> Signup and view all the answers

    Which plant is an example of a water-pollinated flower?

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

    What needs to happen for pollination to occur in Vallisneria?

    <p>Male flowers float away from the parent plant and meet female flowers at the surface of water.</p> Signup and view all the answers

    Which characteristic is NOT true for water-pollinated flowers?

    <p>Stigma is large and feathery</p> Signup and view all the answers

    Which of the following flowers are pollinated by insects?

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

    What is a common misconception about insect pollination?

    <p>Insects visit flowers primarily for pollen.</p> Signup and view all the answers

    Why do pollen grains stick to the body parts of insects during insect pollination?

    <p>Due to their powdery nature</p> Signup and view all the answers

    Which of the following is NOT a feature of wind-pollinated flowers?

    <p>Fragrant and colourful</p> Signup and view all the answers

    What is the main function of the stigma in the gynoecium?

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

    What is formed in the pollen sacs of an anther?

    <p>Pollen grains</p> Signup and view all the answers

    Where are female gametes found in the pistil?

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

    Into what does the ovary mature after fertilisation?

    <p>A fruit</p> Signup and view all the answers

    Which part of the pistil does the pollen tube grow through?

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

    Which parts of a flower are referred to as essential whorls?

    <p>Androecium and gynoecium</p> Signup and view all the answers

    Which of the following is NOT a part of the stamens in the androecium?

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

    What is the primary role of calyx and corolla in a flower?

    <p>Pollination assistance</p> Signup and view all the answers

    Study Notes

    Types of Flowers

    • Flowers can be classified into two types based on the presence of male and female reproductive parts:
    • Bisexual Flowers: Have both male and female reproductive parts (stamens and pistil). Examples: China rose, Mustard, Pea, Gram, Petunia, Rose, etc.
    • Unisexual Flowers: Have either male reproductive part (stamens) or female reproductive part (pistil). Examples: Cucumber, Pumpkin, Papaya, Maize, Coconut, etc.

    Classification of Flowers Based on the Presence of Floral Whorls

    • Flowers can be classified into two types based on the presence of floral whorls:
    • Complete Flowers: Have all four whorls (sepals, petals, stamens, and pistils). Examples: China rose, Petunia, Mustard, Pea, etc.
    • Incomplete Flowers: Have one or more whorls missing. Examples: Mulberry, Pumpkin, Papaya, etc.

    Functions of a Flower

    • The main functions of a flower are:
    • Reproduction: Produces male and female gametes.
    • Ornamental Value: Used for decoration.
    • Source of Food: Develops into fruit and seeds, which grow into new plants.
    • Religious Significance: Used for worship and making garlands.

    More About Flowers

    • Dioecious Plants: Plants bearing male flowers in one plant and female flowers in another plant. Example: Papaya.
    • Monoecious Plants: Plants bearing male and female flowers on the same plant. Examples: Maize, Coconut.
    • A single flower on a twig is called a Solitary Flower.
    • A group of flowers borne on a twig or branch forms an Inflorescence.
    • The twig holding the whole inflorescence is called a Peduncle.

    Interesting Facts About Flowers

    • Nectar of Flowers: Collected by honeybees to prepare honey.
    • Cloves: Dried floral buds used for flavoring food and as a medicine.
    • Smallest Flowers: Belong to the Duckweed plant (Wolffia), measuring about 0.5 mm in diameter.
    • Largest Flower: Rafflesia, found in Indonesia, measuring about 1 meter in diameter.

    Structure of a Flower

    • Thalamus: The upper swollen end of the pedicel.
    • Pedicel: The stalk that attaches the flower to the shoot.

    Parts of a Flower

    • Calyx: The outermost whorl, formed of tiny green, leaf-like structures called sepals.
    • Corolla: The second whorl, formed of petals.
    • Androecium: The third whorl, formed of stamens.
    • Gynoecium: The fourth whorl, formed of a single flask-shaped structure called a pistil.

    Pollination

    • Wind Pollination: The transfer of pollen grains from anther to stigma of flower by wind.
    • Water Pollination: The transfer of pollen grains from anther to stigma of flower by water.
    • Insect Pollination: The transfer of pollen grains from anther to stigma of flower by insects.

    Mechanism of Sexual Reproduction in Plants

    • Pollination: The transfer of pollen grains from anther to stigma of flower.
    • Fertilisation: The fusion of male and female gametes to form a zygote.
    • Dispersal of Fruits and Seeds: The spreading of seeds away from the parent plant.
    • Seed Germination: The growth of a new plant from a seed.
    • Formation of Fruits and Seeds: The development of seeds and fruits from the ovary of a flower.

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    Description

    Learn about the different types of flowers based on the presence of male and female reproductive parts, including bisexual and unisexual flowers.

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