The Stem
Chapter Name : Morphology Of Flowering Plants |
Sub Topic Code : 103_11_05_02_01 |
Topic Name : The Stem |
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Sub Topic Name : Modification Of Stem |
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Introduction
Stems - they develop from plumule of embryo and bear nodes and inter nodes. they are green when young and become brown and woody when they mature.
Pre-Requisites:
Trying to understand how stem gets modified to perform different functions.
Activity:
Stems of plants in and around the area where you stay.
Real Life Question:
Is stem modification necessary?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Underground stem | These stems are modified to store food. Eg - potato, ginger, turmeric. |
| Stem tendrils | These develop from axillary buds. they are slender and highly coiled. Eg- Gourds, water melon, pumpkin. |
| Thorns | Axillary buds also get modified to form woody, pointed, sharp thorns. Eg- citrus |
| Lateral branch | Lateral branch with short inter node and each node bearing Rosette of leaves. This is seen in aquatic plants. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|
Real life uses :
Modifications of stem are helpful to plants in their survival.
Places to visit :
Gardens, parks, botanical gardens etc.
Practical examples around us
| Examples | Explainations |
|---|---|
| Jasmine | It is one of the most common garden plants, where in the slender lateral branch arises from the base of axis, grows aerially for sometime then turns downwards and touches the ground. |
What you learn in Theory:
The various modifications of stem in plants
What you learn in Practice:
Why stem modification is required.