Plant Transport Flashcards
C Day, Plant transport
Multicellular plants
Eg: Geranium or oak trees.
Large, and so have a low surface area to volume ratio.
This means that they must rely on other methods of molecule transportation, not just diffusion.
Which parts of multicellular plants can carry out photosynthesis?
Any green parts
Why do the cells in root tissue need sugars to be transported to them?
These cells absorb mineral ions by active transport, which means that they have a high rate of metabolic reactions such as aerobic respiration. (Sugar/Glucose is needed for respiration)
What are nitrate ions used for in plants?
Producing amino acids
What is a cotyledon?
Embryonic leaf, which unfurls when a seed germinates; which allows the seedling to photosynthesise
Monocotyledonous vs Dicotyledonous
One cotyledon vs two cotyledons respectively.
Woody Dicotyledonous plants
Oak trees, shrubs. Long lived and have a woody stem
Herbaceous dicotyledonous plants
Geraniums and flowers for example. Fast growing and short lived, do not have a woody stem.
Xylem role
Carries water and mineral ions from the roots of the plant up to the stem of the leaves, (Osmosis)
Phloem role
Transports organic molecules such as sugars produced by photosynthesis in the leaves, can travel from the leaves to the roots, or vice versa.
Vascular Bundle
Contains xylem and phloem cells. Also called the stele. Typically in the centre of the leaf cell and surrounded by endodermis. In the stem, they are arranged on the edges to prevent bending from strong wind
Vascular bundle arrangement
Xylem vessels in centre, and phloem vessels around xylem.
Benefits of vascular bundle arrangement
As the xylem vessels are very strong, and in the centre, it prevents the root from being pulled out of the soil; for example by very strong winds.
Lignin
carbohydrate, Impermeable, forms in the cell walls. Prevents substances from leaving cell wall.
