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    شرح يونت 1 ساينس

    Uploaded by

    Rania Moustafa
    The document summarizes the life cycle of plants, beginning with pollination, which can occur through insect pollination of bright colored flowers or wind pollination of small, dull flowers. This is followed by fertilization, where the pollen unites with the ovule to form a seed. Seeds are then dispersed in various ways including by wind, animals, water, explosion, or humans. Germination of the seed occurs when it starts to grow into a seedling with a root and shoot developing. Finally, the seedling grows into an adult flowering plant.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    شرح يونت 1 ساينس

    Uploaded by

    Rania Moustafa
    12 views18 pages
    The document summarizes the life cycle of plants, beginning with pollination, which can occur through insect pollination of bright colored flowers or wind pollination of small, dull flowers. This is followed by fertilization, where the pollen unites with the ovule to form a seed. Seeds are then dispersed in various ways including by wind, animals, water, explosion, or humans. Germination of the seed occurs when it starts to grow into a seedling with a root and shoot developing. Finally, the seedling grows into an adult flowering plant.

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    The document summarizes the life cycle of plants, beginning with pollination, which can occur through insect pollination of bright colored flowers or wind pollination of small, dull flowers. This is followed by fertilization, where the pollen unites with the ovule to form a seed. Seeds are then dispersed in various ways including by wind, animals, water, explosion, or humans. Germination of the seed occurs when it starts to grow into a seedling with a root and shoot developing. Finally, the seedling grows into an adult flowering plant.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    12 views18 pages

    شرح يونت 1 ساينس

    Uploaded by

    Rania Moustafa
    The document summarizes the life cycle of plants, beginning with pollination, which can occur through insect pollination of bright colored flowers or wind pollination of small, dull flowers. This is followed by fertilization, where the pollen unites with the ovule to form a seed. Seeds are then dispersed in various ways including by wind, animals, water, explosion, or humans. Germination of the seed occurs when it starts to grow into a seedling with a root and shoot developing. Finally, the seedling grows into an adult flowering plant.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 18

    Dr.

    Heba Tantawy Life cycle of the plant Unit 2

    Life cycle of the plants

    Pollination -Insect pollination  for bright color


    (Self or cross
    flowers
    pollination)
    -Wind pollination  for small and dull
    flowers
    Fertilization When the pollen stick to the stigma and
    pass downward through the style to the
    ovary and unite or join the ovule to form a
    seed.
    Seed dispersal Is how plants spread their seeds.
    There are many ways for seen dispersal like
     Wind
     Explosion
     Animals' fur
     Animals' excreta
     Human
     Water
    Germination  When the seed starts to grow to
    become a flower, that is called
    germination.
    Flowering  When the seen grows to be an adult
    flower.

    DR. HEBA TANTAWY


    1
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    First remember that


    Male Pollen + Female Ovule = Seed (Fertilized egg)
    BUT how can a pollen of the anther one plant to
    reach the stigma of another plant (as a step to reach the
    ovule) (of the same type) to form a new seed?

    THIS IS THE
    POLLINATION

    OK BUT who will carry these pollens from one plant to


    another?
    The pollinators like insects, animals, human, even WIND &
    WATER can act as pollinators.
    pollinate the verb that means to transfer pollen from an anther to the stigma
    of a flower of the same kind
    pollination the process that brings pollen from an anther to the stigma of a
    flower of the same kind
    pollinator a living thing, such as an insect, that carries pollen from an anther to
    the stigma of a flower.
    But don't forget that WIND can also act as a pollinator for some small
    dull plants.

    DR. HEBA TANTAWY


    2
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    Dr. Heba Tantawy Life cycle of the plant Unit 2

    Insect pollination

    When the insect feels hungry and searches for a nectar to drink (sweet
    liquid from the flowers).
     The insect was attracted to the bright colorful petal of a flower and
    started to collect the nectar.
     While collecting the nectar, it rubs on onto the anther of the flower 
    so pollen sticks on its legs.
     When it feels hungry again, it went to another flower but this time it
    will rub off the pollens onto the sticky stigma of the new flower
     And so the pollens of one plant is transferred to the stigma of another
    plant.

    DR. HEBA TANTAWY


    3
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    NEVER FORGET IN POLLINATION


    To start by the INSECT
    RUB ON 1st flower (Anther)
    RUB OFF 2nd flower (Stigma)

    NOW the pollens of the 1st flower is transported to the sticky


    stigma of the 2nd flower.

    DR. HEBA TANTAWY


    4
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    First remember that

    Pollen + Ovule = Seed (Fertilized egg)


    After pollination :
    The pollen is now sticked on the stigma  it then go
    downward through the style to reach the ovary which
    is filled with ovules or eggs.

    When a pollen fuse with an ovule in the


    ovary it makes a seed or a fertilized egg
    and that is called FERTILISATION

    NB Pollens are yellow and brown powder produced by


    the anther.

    DR. HEBA TANTAWY


    5
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    A seed is now formed

    Look at the seed parts

    DR. HEBA TANTAWY


    6
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    It has
    1. Seed coat
    2. Seed food store = cotyledone
    3. Seed scar or hilum
    4. 1st root = Radicle
    5. 1st shoot = plumule

    1st root and 1st shoot are called Embryo

    DR. HEBA TANTAWY


    7
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    when seeds are spread or scattered away from the


    plant where they formedum.
    Seed dispersal occurs when fruit is ripe and the seeds
    are ready to grow into a new plant.
    Seed dispersal = seed spread over a wide area = enabling new
    plants to grow in different places.

    Q: what is the Importance of seed dispersal?


    A: because if all the seeds of a plant fell close to the parent plant, the
    growing seedlings would have to compete with the parent plant for water,
    nutrients, light and space.

    Q: Mention different Methods or ways of seed


    dispersal or spread?
    A: we have 5 different methods for spreading and dispersing seeds
    according to the size, shape and tase of the fruit seeds.
    1. Wind
    2. Animals either by animal waste products or by sticking on animals;
    fur.
    3. Water
    4. Human
    5. Explosion and bursting

    DR. HEBA TANTAWY


    8
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    1 By Wind :
    Very Light and fluffy fruits fruits have stiff (firm) wings some fruits have opening
    at the top

    Wind blows them When fruits fall off from the When the wind bends the
    tree, they glide or spin in the stalk, and so the dried light
    wind seeds fall out and the wind
    blows them away.
    But it doesn't send the
    seeds very far
    Parachutes Gliders Shakers

    Dandelions ‫الهندباء‬ Maple ‫خشب القيقب‬ Poppy seeds ‫الخشخاش‬


    thistle ‫الشوك‬ Javan cucumber ‫خيار‬

    DR. HEBA TANTAWY


    9
    01006111639
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    2 By Animals
     Tasty, soft and juicy seeds that attract animals to
    eat  dispersed by  Animals' excretions and
    droppings.
     Sticky fruits  dispersed by  animals' fur.
    Examples: Apples and burdock

    3 By water

    Water
    lilies

    Coconut
    Large and heavy seeds dispersed very light seeds that live in water
    by  dropping and rolling and by
    water
    heavy coconuts drop to the ground The seeds float away on the water
    and roll or wash into the sea where for a while, then sink to the bottom
    they float until they reach land of a pond to grow a new lily.

    4 Explosion and bursting


    Fruits that have pods full of seeds like peas
    and Himalayan

    DR. HEBA TANTAWY 1


    01006111639 0
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    DR. HEBA TANTAWY 1


    01006111639 1
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    The seed starts to grow  that is called


    GERMINATION

    Look carefully
    The seed grows down and up

    make a tiny small root

    A shoot starts to grow

    the root grew and became


    branched
    shoot grew and became taller,
    and the leaves start to grow

    THEN by time the leaves increase in number and


    size

    THE SEED NEEDS 2W TO START


    GERMINATION Water and Warm and
    Oxygen (O2)

    DR. HEBA TANTAWY 1


    01006111639 2
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    The seeds DO NOT need SUN to germinate


    because
    1. The seed has its own food store that helps
    it to grow until leaves are developed.
    2. As long as the seed is under the surface of the soil,
    the sunlight will not reach it.

    DR. HEBA TANTAWY 1


    01006111639 3
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    But later on, the plant need Sun, Water, Soil and CO2 to make
    their own food and grow.

    DR. HEBA TANTAWY 1


    01006111639 4
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    Life cycle of the plant

    DR. HEBA TANTAWY 1


    01006111639 5
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    Common misconceptions
    A life cycle ends when the a life cycle describes all the stages of
    plant or animal dies. growth and development a living thing
    goes through in its life, and that the cycle
    continues when new living things of that
    kind are born or grow. Although the life
    cycle of an individual ends when it dies,
    the life cycle of its kind carries on when
    new individuals are created and grow.
    A life cycle always starts with It is a circle that has no beginning or end.
    an egg. Explain that the stages in a life cycle are
    repeated and there is no first or last stage
    All fruits are edible a fruit is the part of the plant that
    contains the seeds. Although we eat
    many fruits, such as oranges and apples,
    NOT all fruits are good for people and
    animals to eat.
    And NOT Only fruits we eat have seeds

    DR. HEBA TANTAWY 1


    01006111639 6
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    DR. HEBA TANTAWY 1


    01006111639 7
    Dr. Heba Tantawy Life cycle of the plant Unit 2

    DR. HEBA TANTAWY 1


    01006111639 8

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