Certain indicators related to disease are given below . Write suitable reason for each . 1) ash coloured thick coating forms in the thorat in dhipteria diseases. 2 It is necessary to prevent the onset of water borne diseases in flood affected parts

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.