SESSION 5 - LEAVES

33 cards

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Created Sep 3, 2009
by
laurens76

 

 
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1
Lamina - what is?
 
Is the leaf blade
2
What is a Petiole
 
It is the stem a leaf is carried on, may extend along the centre of the leaf forming the Mid-rib
3
Where does the leaf grow from on the stem
 
From the NODE on the stem
4
What is the name of the angle formed by the leaf and the stem
 
LEAF AXIL
5
Where are the axillary buds found
 
in the LEAF AXIL
6
What are the leaf characteristics (There are 6)
 

* Leaf Structure

* Attachment

* Arrangement

* Shape

* Venation

*...

7
What is LEAF STRUCTURE
 
Refers to the lamina of the leaf, is it simple or compound
8
What is leaf attachment
 

How the leaf joins the stem

 

9
What is arrangement
 
The distinctive pattern of how the leaf grows on the stem - how the leaves are arranged in...
10
What is the leaf shape?
 
The smape of the lamina of leaf or leaflets
11
What is the leaf Venation?
 
The pattern of the veins on a leaf
12
What is the leaf Margin?
 
The edge of the lamina
13
What makes a compound leaf different from a simple leaf (referring to leaf structure)
 
A compound leaf has leaflets (multiple parts)
14
What is a compound leaf called if the leaflets grwo from the continuation of the petiole &...
 

The leaf is called a pinnate

The leaflets are called pinnae

Ie. Elder (sambucus...

15
What are pinnules
 
Pinnae that are divided up into further leaflets
16
What is a palmate
 
It is where the pinnae grwo from the end of a petiole ie. trifolium pratense (red clover)
17
Name 3 standard leaf attachments
 

Articulate - definate joint can be seen

Petiolate - petiole connects the leaf to...

18
What is sheathing
 
It is a special leaf attachment - bases of petioles wrap around the stem eg Petrolselinum...
19
What is decurrent & perfoliate
 

Decurrent - where the lamina extends onto the side of the stem ie. Comfrey - Symphytum officinale

Perfoliate...

20
What are the 4 types of leaf arrangement
 

Alternate - only 1 leaf growing on each node

 Alternate distichous is when...

21
What does penniveined mean?
 
Small veins run parallel to eachother away from the mid rib on a monocot plant
22
What does Runcinate, Lyrate & Palmatifid refer to when describing a leaf
 

The leaf indentation

Runcinate - sharp indentations, widest at the apens and tapering...

23
Why is the leaf surface coated in cuticle
 
To prevent excessive water loss
24
What is stomata
 
Special openings that can open and clsoe for gas exchage preventing excessing water loss
25
Name the 3 vestiture on the surface of leaves
 

Glabrous - smooth surface w/out hairs or other covering

Glaucous - bluish waxy surface...

26
Stipules
 
Small leaf like structures found in pairs on the base of the petiole
27
Ochrea?
 
Membranous sheath found around the nodes of certain plans - formed from fused stipules
28
What is the leafs function
 

1/ Photo synthesis

2/ Maintenace of water balance

3/ Gaseous exchange

29
Photosynthesis - how does it work
 
The plant processes the suns energy to join carbon, hydrogen and oxygen into sugar molecules
30
What makes a plant green & why is it needed
 
Chlorophyll - needed to absorb the light energy
31
What is the difference between Autotrophs & hereotrophs
 
Autotrophs - Can make their own food - most plants are autotrophs
32
What is an example of a bract
 
Asteracea family - long thin bracts around flower head
33
What are leaf modifications
 

Tendrils - wrap around structures

Spines - protection for plant

Bracts -...

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