The leaf is the main organ of plants responsible for photosynthesis. It comes in different shapes and sizes and contains chlorophyll which gives it a green color. The main parts of a leaf include the petiole, leaf base, and leaf blade. Veins in the leaf blade can be arranged in reticulate or parallel patterns. Leaves are either simple with one leaf blade or compound with multiple leaflets. Compound leaves can be pinnately or palmately arranged. The key functions of leaves are to produce oxygen, food for the plant via photosynthesis, and reduce soil erosion.

1. THE LEAF
PRESENTED BY
AMAN SINGH CHAUHAN
B.SC (ZBC) 4SEM
INVERTIS UNIVERSITY BAREILLY

2. THE LEAF
A leaf is the green, flat lateral outgrowth in plants.They come
in different shapes, sizes, and colors, and are generally dorso-
ventrally flattened , thin and these are also called ‘the kitchen
of the plant’. This is because they are the
main organ responsible for photosynthesis, through which the
plant produces its energy a.k.a. it’s food.
They obtain their green color due to the presence of chlorophyll.

3. PARTS OF LEAF

4. .
Petiole
 It is the stalk that connects a leaf to the stem of the
plant, it is made of complex conducting tissues called
vascular tissues.
Leaf Base
 It is the lowermost part of a leaf, which is closest to the
petiole.
Leaf-blade or Lamina
 It is the thin, flat part of the leaf that is typically green in
color. It is further divided into three parts: i) leaf apex –
the tip of the leaf blade, ii) leaf margin – the edge of the
leaf and, iii) leaf veins – the small channels or capillaries.

5. VENATION
The arrangement of veins in the leaf blade or lamina
is called venation.
It is mainly of two types
Reticulate Venation: In this type of venation there is a
prominent vein called the midrib from which arise many small
veins which finally form a net like structure in the lamina. Ex :
Rose ,Tulsi etc.
ParallelVenation: In this type of venation all the veins run
parallel to each other. Most of the monocot leaves have parallel
venation.
Tulsi Banana

6. TYPE OF LEAVES
Leaves are classified into 2 type :-
1. Simple leave
2. compound leave
Simple leave : Simple leaves are lobed or divided
but do not form distinct leaflets.
Compound leave : compound leaf the leaves are
divided into distinct leaflets and each leaflet has
a small petiole.

7. According to blade…
1. Simple leaf : Has one single blade
2. Compound leaf : has more than one blade

8. Types of compound leaf

9. PINATELY LEAF
1. Uni Pinately : exp : Neem
2. Bi Pinately : exp : Acacia leaf
3. Tri Pinately : exp : Moringa leaf
4. Decompound pinately : exp : carrot leaf
Neem Acacia leaf Moringa leaf Carrot leaf

10. PALMATELY LEAF
1. Unifoliate : ex : Citrus
2. Bifoliate : ex: Gulmohar leaf
3. Trifoliate : ex :Trifolium citrus
4. Quadrifoliate : ex : Paris quadrifolium
5. Mulifoliate : ex : Bombax
Gulmohar Trifolium paris quadrifolium Bombax

11. THE FUNCTION OF LEAVES
 They…
 Produce oxygen for respiration of animals
 Remove carbon dioxide from the air
 Produce food for the plant
 Create hiding place for wildlife
 Are a source of food ( for animal and people)
 Reduce soil erosion by intercepting rains as it falls
 Lower the air temperature as a by product of
transpiration etc..

12. REFERENCES:-
 www.toppr.com
 www.Byju’s.com
 www.britannica.com
 www.pinterest.com
 And other…..

13. .
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