17118582
Description
Flashcards by Sam Gunnell, updated more than 1 year ago
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Created by Sam Gunnell
about 5 years ago
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| Question | Answer |
| What are the three parts of the xylem tissue? | Xylem vessel Fibres Xylem parenchyma |
| What is the xylem vessel? | Columns of fused, hollow, dead cells |
| What do xylem vessels transport? | Water and mineral ions up the plant |
| What are the fibres made of in the xylem tissue? | Long dead cells with thick cell walls |
| What do the fibres do? | Provide support |
| What is the xylem parenchyma? | Living cells that form packing tissue and stores food |
| Why has the xylem parenchyma adapted to have a bitter taste? | To protect against insects tryong to eat it |
| Why does the xylem vessels have an empty lumen? | So that nothing can impead the flow of water and mineral ions |
| What are the two funtions of lignin? | -Prevents the xylem vessel from collapsing inwards -Lignin allows for adhesionof water molecules |
| What do pits allow for? | They allow for water to flow between xylem and plant |
| What does phloem transport? | Assimilates |
| What are the two parts of phloem tissue? | Sieve tube elements Companion cells |
| What does parenchyma do? | Fills up spaces in the cells |
| What is the function of fibres in the phloem? | Support |
| What part of the phloem is a column where the assimilates go? | Sieve tube |
| What is the function of the companion cell? | To carry out metabolic reactions for transport |
| One of either the companion cell or sieve tube contain more of specific organelles. Which part has more of what organelles? | The companion cell contains more mitochondria and rough endoplasmic reticulum to carry out metabolic reactions for transport, such as aerobic respiration |
| Are the sieve tube walls lignified? | NO |
| How are the companion cell ad sieve tube connected? | Plasmodesmata |
| How is the companion cell adapted to increase transport? | The cell surface membrane infolds to increase surface area for more respiration |
| Does phloem contain pits? | Nope |
| In what direction does phloem transport assimilates around the plant? | Up or down (from source to sink) |
| What is cambium? | A layer of meristem cells capable of making xylem and phloem |
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