TASK DEFINITION: You are given a sentence and your task is to generate another sentence that supports the given input.
PROBLEM: Phototropism and gravitropism function to differentially adjust the position of the plant's major organ systems so that, regardless of how the seed is orientated in the soil, the shoot grows up into the sunlight and the roots grow down into the soil for water and mineral absorption.

SOLUTION: Gravitropism ensures that roots grow into the soil and that shoots grow toward sunlight.

PROBLEM: Examples of primary pollutants are exhaust fumes (gas) from cars, soot from smoke, dust storms and ash from volcanic eruptions (as seen in the picture on the left).

SOLUTION: Ash that enters the air naturally as a result of a volcano eruption is classified as a primary pollutant.

PROBLEM: Complete development of the flora was achieved in the presence of Angiosperms, the most evolved plants.

SOLUTION:
Angiosperms are the most successful phylum of plants.