New GCSE Science Syllabus
Biology - Phloem - the key facts
To make sure you do the very best you can in your Biology exams we’re going to go through the key facts for phloem. There’s also a song on this so have a listen to that as well!
Here are a few facts about phloem and the comparisons to xylem:
Made up of living cells (unlike xylem)
The cells are arranged end to end (like xylem)
Contains a cytoplasm (unlike xylem)
This cytoplasm moves from one cell to the next through small holes
Phloem is what transports amino acids and sucrose from the leaves to other parts of the plant. This transportation is called translocation and happens between where substances and formed and stored or used. Substances are formed in the sources and stored or used in the sinks.
An example of translocation is when sucrose is moved in spring time from the roots to the leaves. The roots are the sources and the leaves are the sinks. In summer sucrose moves from sources in leaves to sinks in roots.
Pesticides and other chemicals also move around through translocation.
If you haven’t listen to our song on Phloem then go ahead and have a listen! It will help you remember what we’ve gone through in this blog and moves you one step closer to a better Biology grade.
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