Lesson 26: The Shoot System

Chapter 8 Lesson 26: The Shoot System

Parts of the shoot system

THE SHOOT SYSTEM

Shoot System - is the part of a plant that generally present above the soil. It consist of stem, branches, leaves, buds, flowers and fruits. 

Stem - is the main part of the shoot system.
-It is usually located above the ground and bears the branches, leaves, buds, flowers and fruits.
-It forms the backbone of the shoot system. STEMS Divided into 2-parts

• Node- A point in the stem where a leaf, a branch or a bud arises.

• Internode-the portion of the stem between two nodes.

Parts of the Shoot System

Open Ended

Label the following parts of a shoot system in the picture. Write no. 1. ______(answer) 2. ______(answer),3. _______, 4. ___________, 5. ___________, 6._______

A stem has 2 main functions

• It keeps the plant upright

• It helps in transportation of water, minerals and food to all other plant parts.

Multiple Select

Choose the 2 main functions of stem.

• It gives beauty to the plant

• it keeps the plant erect

• It absorb water from the soil

• It transports the water and mineral to all other parts of the plants

Thus, stem transport water and minerals and food from the roots to the parts of the plant.

• Xylem- is a thin tubes in the stem that carried up the water and minerals to other parts of the plants.

• Phloem - another set of tubes in the stem used for transporting food prepared by leaves to the other parts of the plant.

Modifications of Stem

• Support                                                                                                           **Tendrils

• Storage                                                                                                examples ginger, potato and onion
  
  

• Making Food                                                                                    examples: cactus, and other desert plants

The Leaf

Leaves are responsible for carrying out the process of photosynthesis by which plants manufacture their own food.
-Leaves differs in shape and size
VARIOUS TYPES OF LEAVES
**Lamina-  is the flat broad part of the leaf
-Lamina receives solar radiation which is used in photosynthesis.
- Lamina is attached to the stem with the help of small stalk called petiole.
-Veins is a small lines on the leaves. The veins are responsible for the transfer of water and minerals in the leaves.
-Midrib- is a thicker line or vein in the middle of the leaves.
-Venation- are veins that are arrange in specific pattern on a leaf.

Parts of a Leaf

Write down your answer for 1, 2, 3  parts of a leaf.

Next slide is a quiz: Label the parts of leaf

Open Ended

Label the parts of a Leaf 1. _______, 2_________ 3. ______

Modifications of Leaves

1. Leaves are modified into Spine leaves such as cactus  which grows in the desert place where there are scarcity of water.

2. Insectivorous Plants-such as Pitcher plant, the leaf is modified to form a pitcher for capturing insects

3. Tendrils- is the tip of leaves is modified provide extra support to the plant. example: Garden Pea

FLOWER

A flower  is the reproductive part of the plant.
- It is the most attractive part of a plant.
-It bears the reproductive structures inside.

Structure of a Flower

• Sepals- are the outermost layer of the flower. 

• Petals- inside the sepals you will see a layer of brightly coloured modified leaves.

• Stamens- the male reproductive parts of a flower. -Anther- the part of a stamen that contains the pollen and the upper flat part of stamens. -Filament     -consists of a slender stalk and it supports the anther, which is where pollen develops.

• Pistil- is the female reproductive organ. Parts: stigma, style, ovary, ovule
  
  

Multiple Select

Stamen is the male reproductive part of flower it consists of _____ and _____

• ovary

• anther

• filament

• style

Multiple Select

Pistil is the female reproductive part of flower it consists of the lower swollen portion which is called as _______

• style

• ovary

• ovule

• stigma