Back to AI Flashcard MakerBiology /OCR Biology A - 3.1.3 - Transport in Plants Part 1
OCR Biology A - 3.1.3 - Transport in Plants Part 1
This deck covers key concepts related to plant transport systems, including the roles of various plant tissues and pathways, factors affecting transpiration, and the structure and function of roots and stems.
What distinguishes stems from other parts of the plants
Presence of nodes and internodes
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Key Terms
Term
Definition
What distinguishes stems from other parts of the plants
Presence of nodes and internodes
Role of vascular cambium
Responsible for secondary growth and contains meristematic tissue
Functions of roots
Anchor the plant in the ground Store excess carbs Absorbs water and minerals
Role of parenchyma
Involved in respiration, photosynthesis, storage and secretion Heavily lignified
What is collenchyna tissue made of
Collenchyma cells Pectin Cellulose
Role of collenchyma
Provide support Expands as the stem grows
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| Term | Definition |
|---|---|
What distinguishes stems from other parts of the plants | Presence of nodes and internodes |
Role of vascular cambium | Responsible for secondary growth and contains meristematic tissue |
Functions of roots | Anchor the plant in the ground Store excess carbs Absorbs water and minerals |
Role of parenchyma | Involved in respiration, photosynthesis, storage and secretion Heavily lignified |
What is collenchyna tissue made of | Collenchyma cells Pectin Cellulose |
Role of collenchyma | Provide support Expands as the stem grows |
Role of endodermal cells | Regulates the substances that enter |
What is pericycle made of | Parenchyma and sclerenchyma |
Role of pericycle | Maintains meristematic activity |
What is xylem tissue made of | Tracheids Vessel elements Parenchyma Sclerenchyma |
Embolisms | Air bubbles formed in plant capillaries |
Ions needed by plants | NO3 ^2- Mg ^2+ PO4 ^3- K ^+ SO4 ^2- |
What is the cortex made of | Parenchyma |
Transpiration | Loss of water from leaves of a plant, occurs from underside of leaf (stomata) Water moves from areas of high hydrostatic pressure to areas of low hydrostatic pressure |
Functions of water in plants | Turgidity - keep stems and leaves rigid Photosynthesis Enzyme reactions - metabolic processes occur in solution Transport - ions absorbed in solution and transported in xylem |
Apoplastic pathway | Water moving from soil solution to root hair and across cortex to the xylem in the cell walls |
Symplastic pathway | Water moving from soil solution to root hair and across cortex to the xylem through the cytoplasm and plasmodesmata |
Vacuolar pathway | Water moving from soil solution to root hair and across cortex to the xylem through the vacuoles |
Factors affecting rate of transpiration | Temperature Humidity Light intensity Wind |
Lignin | Causes spirals in xylem Allows cells to stretch/expand |
Adaptations of vessel elements | Hollow lumen Perforated cell ends Lignin for rigidity |
Casparian strip | Controls amount of water coming in the endodermis |
Factors affecting transpiration | Temperature Humidity Light intensity Air movement Soil water availability |
Control variables when using potometer | Cut at an angle to increase SA of lumen Bung to stop water evaporating Assemble potometer underwater - prevents air from entering Dry leaves - no water molecules blocking stomata |
Functions of roots | Anchor the plant in the ground Store excess carb reserves Absorb water and minerals |