PowerPoint of plant systems content for year eight biology

1. Plant Systems

2. Plant Systems
 Multicellular with interacting systems
 Internal systems carry out activities inside the plant, just
like the human body

3. Photosynthesis
 Carbon dioxide + water glucose + oxygensunlight

4. Respiration
 Glucose + oxygen carbon dioxide + water
 Respiration produces the energy needed for cell functions

5. Gas Exchange
 Leaves are structured to allow the exchange of gases
 Carbon dioxide gas enters through the stomata in the leaf
 Oxygen leaves
 Each stomata is opened and closed by two guard cells

7. Roots
 Absorb water and minerals from the soil
 Root hairs grow away from the main root and
increase the surface area for absorption

8. Roots
 There are two main types of roots:
 Tap roots: large, central roots that reach deep underground
water sources
 Fibrous roots: branching roots that help hold soil in place to
prevent erosion

9. Plant Circulatory System
 Plants have tissues to carry nutrients where they are
needed and carry wastes away
 These tissues are xylem and phloem

10. Xylem
 Tube shaped cells with thick walls
 Circulate water and dissolved minerals
 E.g. phosphorus, nitrogen, calcium, magnesium
 Help to transport the water from the roots in the ground
to the leaves right at the top

11. Xylem
 Made up of vessels connected end-to-end
 The tissue dies when it matures after a year: this forms
the rings in the tree trunk
 Water and nutrients travel through the dead, tube like
vessels

12. Tree Rings

13. Phloem
 Made from living cells
 Sugars such as glucose are produced in the leaves by
photosynthesis
 Phloem tissues carry the glucose from the leaves to the
stems and roots
 Xylem and phloem are grouped together in vascular
bundles

15. Water Circulation
 Water evaporates and is lost through the stomata (this is
called transpiration)
 This pulls water upwards from lower in the plant through
the xylem.
 This is similar to drinking through a straw