Page 31 - Biology - XII

SPOT - 2

Flowers Adapted to Pollination by Insects—Entomophilous fl owers
A. Mustard Flower (Brassica campestris)

Flower

Immature fruits
Terminal raceme

Fruit
Leaf

Stem
Stem

Fig. 6.7 (a): Mustard - fl ower (Pictorial) Fig. 6.7 (b): Flowering twig (Diagrammatic)

Draw the fi gure and write comments in your practical record fi le.
Comments

1. It is the fl ower of mustard (Brassica).
2. The fl owers are arranged in a typical raceme.

3. Flowers are yellow, attractive, complete, and bisexual.
4. Flower has four petals and shows valvate/imbricate arrangement.
5. Stamens are six, carpels are two.
B. China Rose Flower (Hibiscus rosa sinensis)

Flower

Pedicel

Leaf
Stem

Fig. 6.8 (a): China rose (Pictorial) Fig. 6.8 (b): China rose (Diagrammatic)

Comments
1. It is the fl ower of China rose-Hibiscus rosa sinensis (Vern. Gurhal).

2. The fl ower is solitary and does not form an infl orescence.
3. Flower is big/large, bright pink or red in colour and showy.
4. Flower has fi ve petals, it is complete and twisted.
5. Stamens are monoadelphous.

6. Carpels are fi ve, style is long and passes through stamina tube. At the end of the top are fi ve
distinct rounded stigmas.

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