The mode of dispersal of the seeds having following properties are as follows:
(a) Seeds with wings-like seeds of drumstick and maple become light weighted and can be blown away by air. Thus, these are dispersed by wind.
(b) Small and light seeds like seeds of grasses and cotton (having hairy growth) are also dispersed through wind.
(c) Seeds of Xanthium, Urena have spines and hooks on them, these hooks or spines are attached to the fur of the animal body. When animals move to other places and rub their body with tree, etc., these seeds fall from their body and get dispersed. Therefore, these are dispersed through animals.

The parts in the given figure are labelled as follows

The main differences between asexual and sexual reproduction are

Different methods of asexual reproduction are:
(i) Fragmentation Parent body divides into distinct pieces or fragments, each of which grows into new individuals, e.g. Spirogyra (an alga).
(ii) Budding A small part of parent body grows out as a bud, which detaches and becomes a new individual. Sometimes, a chain of buds is also formed, e.g. yeast, corals, sponges, etc.
(iii) Spore formation Parent plant develops and releases thousands of tiny, spherical and unicellular asexual spores, which are protected by a cell wall. When these spores find favourable environment, they grow into identical new plants, e.q. mosses, ferns, bread moulds, etc.
(iv) Vegetative propagation Many plants like cacti, potato, rose, sugarcane, etc., reproduce by this method. New plants are produced from vegetative parts of mother plant such as roots, stem, buds and leaves.

The reproductive part of a plant is the flower.

(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.

Vallisneria and Hydrilla.

The given figure shows self-pollination, as the pollen grains from anther of flower are transferred to the stigma of same flower.

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.

Fungus, moss and fern reproduce by the common method of spore formation which is a type of asexual reproduction.

Agent of pollination:
(i) Wind
(ii) Water
(iii) Animal i.e., insect, bird etc.

The method of seed dispersal in the fruits and the parts which help in the seed dispersal:

The various parts of a flower whose functions are mentioned above are labelled as follows: