Question

the growth of pollen tube toward ovary shows​

Answer 1

Explanation :

Chemotropism is the growth movement shown by the plant structures towards the chemical stimulus. For example, chemicals released by the ovary act as a stimulus for the growth of pollen tube/s towards the ovule.The pollen tube grows through a stylar canal or a stylar transmitting tissue, and reaches the locule cavity of the ovary where the ovule is located.A pollen tube grows through the tissues of the flower until it reaches an ovule inside the ovary . The nucleus of the pollen grain (the male gamete ) then passes along the pollen tube and joins with the nucleus of the ovule (the female gamete). This process is called fertilisation .Pollen tube growth is influenced by the interaction between the stigma-style and the pollen grain. The elongation of the tube is achieved with elongation of the cytoskeleton and it extends from the tip, which is regulated by high levels of calcium in the cytosol.