Page 89 - Biology - XII

If number of carpels is more than one and they are free, then they are known as Apocarpous. Here, each
carpel has its own style and stigma, e.g. Rose [Fig. 16.6(a)]. In Syncarpous, carpels are united, e.g. Lady
fi nger, Tomato [Fig. 16.6(b)].
Depending upon the number of foculen in ovary, fl owers may be unilocular, bilocular, or multilocular.
1. Unilocular: One locule, e.g. Rose, Pea

2. Bilocular: Two locules, e.g. Datura
3. Multilocular: Many locules, e.g. Lady fi nger, China rose

(a) (b) (c)

Fig. 16.6: (a) Apocarpous and (b) Syncarpous

On the basis of placentation, fl owers may be divided into:
1. Marginal: The placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on
this ridge, e.g. Pea [Fig. 16.7(a)]
2. Axile: The ovary is partitioned into several chambers or locules and the placentae are borne along the
septa of the ovary, e.g. Tomato, China rose [Fig. 16.7(b)]
3. Parietal: The ovules develop on the inner wall of the ovary or on peripheral part. Ovary unilocular, but
in some cases becomes two chambered due to formation of a false septum, e.g. Mustard [Fig. 16.7(c)]
4. Free central: Ovules are borne on the central axis and septa are absent, e.g. Carnation, Chilly [Fig. 16.7(d)]

5. Basal: Placenta develops at the base of the ovary, e.g. Sunfl ower [Fig. 16.7(e)]
6. Superfi cial: In this case ovulex are attached to the inner surface of ovary and the gynoecium is
multicarpellary, e.g. lily, nymphara [Fig. 16.7(f)]

(a) (b) (c)

(d) (e) (f)
Fig. 16.7: (a) Marginal (b) Axile (c) Parietal (d) Free central (e) Basal and (f) Superfi cial

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