Question

the maturation time of male and female flowers in vallisneria is different explain why

Answer 1

Vallisneria pollination is through hdrophilly ie through water. In Valilisneria, the female flower appear on the surface of the water as it have a long stalk. The pollen grains released by the male flower reaches to female flower for fertilisation through water currents.
In sea grass, the female flowers are seen submerged in water and the pollen grains are released inside the water. The pollen grains reach stigma for pollination.
The moth and Yucca plant is mutually benefited by their association. The moth lay eggs in the ovary of yucca flower which helps the plant in pollination. When the egg hatches, the larva feed the fruits and seeds of the plant. Thus the plant provide food and shelter to the moth and moth helps the plant to pollinate. 

Answer 2

Answer:

Explanation:

Two distinct types of propagation are seen and also sexually (flowering) and asexually (vegetative). The male and female flowers are seen in different plants (dioecious). The Vallisneria plant stems bearing flowers can grow as fast as 3/4 inches per hour (2 cm per hour). The stem having the male flower is short and hence when the flower releases pollinating particles they move up to reach the female flower and pollinate.