The document discusses different plant structures and their functions. It explains that seeds contain a radicle and plumule, where the radicle grows into the roots below ground and the plumule grows into the stem above ground. Roots have two types - taproots and fibrous roots. The stem contains nodes and internodes and bears leaves, flowers and fruits. Leaves have a lamina, petiole and base, and perform photosynthesis. Leaves have two venation patterns - reticulate and parallel venation.

2. Which part of the plant help in preparing food?
Which part helps in absorbing water?

4. PLANTS: STRUCURE AND
FUNCTION.
SADIKA KHAN
GRADE: 7TH

5. WHERE DOES A PLANT COME
FROM?

6. kcdSEED

7. WHAT IS A SEED?
1. Seed is a small, round or oval object produced by a plant and
from which a new plant is born
2. A seed has two main parts: Plumule and Radicle

8. What is a Plumule
and Radicle?
The part that grows from inside the
seed towards the soil is called the
radicle
The part that grows above the soil is
called the plumule

10. Lets us identify different types of roots and
their functions

11. What are roots?
• Roots are the parts of the
plants which usually
remains underground.
• They collect water and
minerals from the soil

13. TYPES OF ROOTS:
Roots are mainly of two types : Tap root and fibrous
root

14. What are taproots?
• A Tap root has a large, central
and dominant primary root
from which other secondary
roots grow laterally
• Taproots are long and goes
deep into the ground to find
water and minerals
• Few examples are: carrot ,pine
tree etc

15. What are Fibrous Roots?
• Fibrous roots consists as
several thin threadlike roots
• Fibrous roots are short and do
not go deep into the soil
• Grows in regions where water
is available near the ground
surface
• Few examples are : Grass,
coconut tree etc

17. Let us identify structure of the stem and their
functions

18. What is a Stem?
• The stem is the part of the
plant which is above the
ground
• It grows from plumule of a
seed
• It bears leaves , fruits an
flowers

19. STRUCTURE OF A
STEM:
● Stem consists of
nodes and internodes
● The region where the
leaves arises is known
as the NODE
● The region between
the nodes is known as
the internode

21. Let us identify different structures and the
different types of leaves

22. What are leaves ?
• Leaves are green ,thin , flat
organs responsible for
photosynthesis in the plants
• It arises at the node of the
stem

23. Functions of a leaf ?
• Green leaves prepare food by
using water , minerals and
carbon dioxide in the presence
of sunlight,. This process is
called Photosynthesis
• Leaves removes excess water
from plants through tiny pores
called stomata. This process is
called transportation

24. PARTS OF A LEAVE
Leaves are divided into three main parts:
1. Leaf base 2. Petiole 3.Lamina

25. WHAT IS LEAF BASE?
This is a part where a leaf attaches
to a stem
Leaf base

26. WHAT IS PETIOLE?
Petiole is the long thin stalk that
links the lamina to the stem
Leaf base
Petiole

27. WHAT IS LEAF LAMINA?
Leaf base
Petiole • Also known as leaf blade
• It is the green flat surface
of the leaves
• It consist of small
branched veins
• The vein that run along the
middle of lamina is called
Midrib or Mid vein
Leaf lamina

28. What is venation in
leaves?
• Venation is defined as the
arrangement of veins in the
leaves
• Veins helps in supporting the
lamina and in the
transportation of food and
water
• There are two types if
venation RETICULATE AND
PARALLEL

29. A] RETICULATE
VENATION
• In a reticulate venation, the veins
are randomly arranged and forms a
complex network
• Eg : Rose leaves

30. A] PARALLEL
VENATION
• In parallel venation veins run
parallel to each other
• For eg: Banana leaves

31. 1. SEED: A small, round or oval object produced by a plant and from which a
new plant is born.
2. ROOTS: The part that grows from the radicle . There are two types of
roots tap root and fibrous root.
3. STEM: The part that grows from the plumule and which remains above the
ground
4. LEAVES: They are flat organs responsible for the photosynthesis. There
are two types of leaves : simple and compound leaves. There are two types
of venetion : reticulate and parallel venetion
SUMMARY

32. 1. Describe the function of roots?
2. Define Radicle an Plumule
3. Discuss the various venation of leaf with examples
EVALUATION

33. EXERCISE

34. Sketch various types of leaves in paintbrush on the
computer and save the sketches in a folder of your own
name
ASSIGNMENT