Page 14 - Chapter 14 Reproduction
P. 14
^ a <- Examination of mustard flower, gram
14.J r see(j an(j maize grain
a: Examination of mustard flower Date
Flower is the reproductive part of a plant. Brassica flower consists of stalk
called pedicel. The flattened tip of pedicel is called thalamus or receptacle, on
which floral leaves are arranged in whorls. Sepals are four in number and
generally greenish in color situated at the base ofthe flower. The whorl of sepals
is known as calyx. Petals are four in number, yellow in colour and liejust inside
the sepals. The whorl of petals is called corolla. Stamens are six in number and
are male organs of the flower. The whorl of stamen is known as androecium,
which lies inside the petals. Each stamen has a single stalk called the filament
which bears two small sacks at its tip called anthers. Anthers contain pollen
grain. Carpel is a female organ of the flower and the whorl of carpels is called
gynoecium. It lies in the centre and consists of two carpels, which are fused
together. Each carpel has a swollen lower part called ovary. The ovary extends
above into a thin stalk called style and swollen tip of style is called stigma. The
ovary contains ovules, which are ripened to form seeds. Ovary is ripened to
form fruit.
(Female) Anther I stamen
Filament! (male)
Short anther Ovule
Pedicel- — Nectary
Receptacle
Fig 14.9: Structure of Brassica Flower
Brassica flower, magnifying glass, glass slide or
petri dish, forceps
1. Take a Brassica flower, place it on a glass slide and observe its parts by
a magnifying glass.
2. Separate its various parts by using forceps and study them.
14.J r see(j an(j maize grain
a: Examination of mustard flower Date
Flower is the reproductive part of a plant. Brassica flower consists of stalk
called pedicel. The flattened tip of pedicel is called thalamus or receptacle, on
which floral leaves are arranged in whorls. Sepals are four in number and
generally greenish in color situated at the base ofthe flower. The whorl of sepals
is known as calyx. Petals are four in number, yellow in colour and liejust inside
the sepals. The whorl of petals is called corolla. Stamens are six in number and
are male organs of the flower. The whorl of stamen is known as androecium,
which lies inside the petals. Each stamen has a single stalk called the filament
which bears two small sacks at its tip called anthers. Anthers contain pollen
grain. Carpel is a female organ of the flower and the whorl of carpels is called
gynoecium. It lies in the centre and consists of two carpels, which are fused
together. Each carpel has a swollen lower part called ovary. The ovary extends
above into a thin stalk called style and swollen tip of style is called stigma. The
ovary contains ovules, which are ripened to form seeds. Ovary is ripened to
form fruit.
(Female) Anther I stamen
Filament! (male)
Short anther Ovule
Pedicel- — Nectary
Receptacle
Fig 14.9: Structure of Brassica Flower
Brassica flower, magnifying glass, glass slide or
petri dish, forceps
1. Take a Brassica flower, place it on a glass slide and observe its parts by
a magnifying glass.
2. Separate its various parts by using forceps and study them.
