Summary Biology IB Diploma Program Topic 9: Plant Biology
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Course
Biology HL
Institution
Book
IB Biology Course Book
Detailed notes on plant biology of the IB diploma program at Higher Level. Includes detailed diagrams, exam tips and notes, IB-style questions and worked examples.
Summary document of Chapter 5 Evolution and biodiversity IB Biology
Tema 3: Metabolismo
IB Biology Full Course Notes + Required Drawings Units 1 - 11 & Option D
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topic 9
:
Plant Biology
9. 1 Structure and function are correlated in the xylem of plants .
9.2 Transport in the phloem of plants .
9. 3 Plants adapt their growth to their environmental conditions .
9.4 Reproduction in
flowering plants is influenced by the biotic
and abiotic environment .
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Monday ,
12 April
nxylemnnofplants
② Introduction :
② Plants are extremely important part of life on Earth .
② Plants
produce oxygen and carbohydrates while absorbing CO2 from our atmosphere .
②
Removal of carbon dioxide i critical due to global warming .
② The plant Kingdom its
is vast in diversity .
② Basic leaf structure :
@ Water is lost in the form of a
gas from the leaf through openings called stomata ( singular stoma ) .
@
Transpiration = loss of water vapour from leaves and other aerial parts of the plant .
@ Water lost from the plant 's upper structures must be replaced by water absorb tion .
@ leaves are the main plant organs involved in photosynthesis .
@
Leaves consist of :
@ -
flattened portion + blade .
@ Stalk that attaches the blade to the stem
>
petiole .
learn ! ②
CUTICLE : layer of wax as the outermost layer of leaves This
.
layer
protects the plant water lost and insect invasion
against .
② EPIDERMIS this is the outermost layer when cuticle is
:
no
present to protect the plant .
② XYLEM : it is vesicular tissue that
a type of brings water to
the leaves .
② PHLOEM : it is the second type of vesicular tissue of leaves
that carries the products of photosynthesis to the rest of
② PALISADE
MESOPHYLL :
a
densely packed region the plant .
②
of cylindrical cells occurring in the upper portion Both the xylem and Pholem occur together in veins or
of the leaf ( cells
. contain high levels of chloroplasts vascular bundles .
②
to carry out photosynthesis) .
SPONGY MESOPHYLL located :
on the bottom portion of the leaf ,
Gas exchange surfaces → consists
of loosely packed cells with
few chloroplasts (Air spaces t )
. .
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