Sexual Reproduction In Flowering Plants Flashcards
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LIFE SCIENCE & ENVIRONMENT
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F2. (c) Sexual Reproduction in Flowering plants
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does reproduction occur in flowering plants
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134
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Flower is sexual reproductive structure of plants
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especially in angiosperms. It is modified
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reproductive shoot and helps in sexual reproduction of plants. It consists of thalamus on
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7
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which four sets of floral whorls are arranged in orderly manner.
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on the floral axis is called Inflorescence or Anthotaxy.
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e Different parts of a typical flower :
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Androecium and Gynoecium that are successively arranged.
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A typical flower consists of a thalamus with four sets of floral leaves-Calyx
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Corola
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Corolla
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rain etc.
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Calyx
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Epicalyx
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Anther
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grains.
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Filament-
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Single Stamen
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- Sepal
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Petal
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The arrangement of
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B
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Corolla
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Stamens
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Thalamus
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Fig. 2.34 : Different parts of a typical flower (Hibiscus rosasinensis).
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\ower
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Function-Petals protect the inner Androecium and Gynoecium.
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Stigma
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Style
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) Calyx : It is the outermost part of the flower and consists of some green leaf like
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structures known as sepals.
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Ovary
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Function-Sepals protect the inner parts of flower in bud condition from heat
cold.
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Calyx
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() Corolla : It is the second inner floral set
consisting of several leafy structures called
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petals. Generally they have bright colour or beautiful smell or both.
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(ii) Androecium : It is the third inner floral whorl consisting of a number of male
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reproductive organs known as stamens. Each stamen consists of a slender stalk called filament
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and a saclike structure at the top of the filament
known as anther (pollen sac). The pollen
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sac produces pollen grains that are commonly yellowish in colour.
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Eor reference only:
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Function--Anther of stamen produces male reproductive units of flower called poien
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CONTINUTY OF LIFF
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1. Thhe bright colour of
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ovary. Ovary contains one or more ovule and each ovule contains an egg cell.
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2. The white colour of
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(iv) Gynoecium or Pistil : It is the innermost whorl of the flower. It consists of one o
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Anthocyanin is waters
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3. Flower
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more female reproductive part known as carpel. Each carpel consists of a receptive terminal
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portion called stigma
a long slender stalk called style and a swollen basal portion called
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A The flower that c
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Gynoecium is called
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absent
it is calied
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5. In male flowers
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flowers
only Gyr
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Bisexual flowers
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dioecious (e.g.
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7. Beautiful smell
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8. Arrangement
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Access
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Essent
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Function-
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fertilization
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A Polli
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The flovw
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the anther
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Definiti
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of carpel
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A Ty
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Pollir
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Allogam
