If the filament of Spirogyra are broken into fragments, then each fragment will develop into a new plant.

Unisexual flowers are those which contain either male or female reproductive part and bisexual flower has both reproductive parts (i.e. male and female) on the same flower.

Flowers are so colourful because they absorb and reflect light energy. Fragrance results from production of volatile chemicals which evaporate.

Branch can be used to grow a new rose plant. As, rose reproduces by vegetative propagation, i.e. stem cutting method.

Pollen grains.

Ovary is the part where male and female gametes fuse together.

The male reproductive part is stamen and the female reproductive part is pistil.

Pollen grains have a tough protective coat which presents them from drying up.

Vallisneria and Hydrilla.

After fertilisation, the ovary of a flower develops and becomes a fruit with seeds present inside.

After pollination and fertilization the ovary develops into fruit and ovules develop into seeds.

The air contains spores of bread mould which can survive in air for long time due to presence of a thick wall. When they fall on a piece of moist bread they germinate on it.

(i) Asexual reproduction: The mode of reproduction in which new plants are obtained by single parent without production of seeds is called asexual reproduction.
(ii) Sexual reproduction: The mode of reproduction in which new plants are obtained from seeds is called sexual reproduction. In this process, fusion of male and female gametes takes place.

The mode of asexual reproduction in which new plants are produced from roots, sterns, leaves and buds of parent plant is called vegetative propagation.

Ripened ovary after fertilization is called fruit. There are two types of fruits:
(i) Fleshy fruits: The fruits which are fleshy and juicy like mango, apple and orange are called fleshy fruits.
(ii) Dry fruits: The hard fruits like almonds and walnut are called dry fruits.