Page 88 - Biology - XII

On the basis of attachment of fi lament to another, there are mainly four types of anthers.
1. Basifi xed: Filament attached to the base of anther, e.g. Mustard [Fig. 16.3(a)]

2. Adnate: Filament attached along the whole length of anther, e.g. Michelia, Magnolia [Fig. 16.3(b)]
3. Dorsifi xed: Filament attached to the back of anther, e.g. Passion fl ower [Fig. 16.3(c)]
4. Versatile: Anther lobes attached with fi lament in the middle portion with both ends free, e.g. Gramineae
family [Fig. 16.3(d)]

(a) (b) (c) (d)

Fig. 16.3: (a) Basifi xed (b) Adnate (c) Dorsifi xed (d) Versatile

On the basis of dehiscence, anthers are of the following two types.
1. Porous: Pollens released through pores, e.g. Brinjal,
Potato [Fig. 16.4(a)]

2. Longitudinal: Pollens released through the longitudinal
slit of another lobes, e.g. China rose, Cotton [Fig. 16.4(b)]

(a) (b)

Fig. 16.4: (a) Porous and (b) Longitudinal

On the basis of position of ovary, fl ower are of three types as mentioned below.

1. Epigynous: Position of ovary inferior to other fl oral parts, e.g. Mustard, China rose [Fig. 16.5(a)]
2. Perigynous: Other fl oral parts are attached around the ovary, e.g. Apple, Guava [Fig. 16.5(b) and (c)]
3. Hypogynous: Position of ovary superior to other fl oral parts, e.g. Sunfl ower [Fig. 16.5(d)]

(a) (b) (c) (d)

Fig. 16.5: (a) Epigynous (b–c) Perigynous and (d) Hypogynous

87