Chapter 25, Problem 12A

Summary Introduction

Introduction:

Phloem tissue which is made up of sieve tubes and companion cells, is responsible for the transports of sugars to the whole plant parts .The part which produces or synthesizes sugar is called source and the parts that receives sugars from the source are known as sink. The source of sugar synthesis is leaf of a plant and sink are usually non photosynthetic parts of plants that are not able to make sugars like, fruits, flowers, shoot meristems, roots and other storage organs.